Multi-differential operational amplifier. RU patent 2513489.
 Broadband cascade amplifier / 2513486Invention relates to radio engineering and communication and can be used as an analogue signal amplifier in analogue microcircuit structures of various purposes (e.g. broadband and selective HF and UHF amplifiers) The broadband cascade amplifier includes an input transistor (1) whose source is connected to a first (2) power supply bus, the gate is connected to an input voltage source (3) and the drain is connected to a first (4) output transistor and the inverting input of an auxiliary voltage amplifier (5), the output of which is connected to the gate of the first (4) output transistor, and the non-inverting input is connected to a reference voltage source (6), a load circuit (7), connected between the output of the device (8) and a second power supply bus (9). The drain of the first (4) output transistor is connected to the source of an additional transistor (10), the drain of which is connected to the output of the device (8) and the gate is connected to the input of an additional non-inverting current amplifier (11), the output of which is connected to the source of the first (4) output transistor or the source of the additional transistor (10), wherein an additional current-stabilising two-terminal element (12) is connected between the second (9) power supply bus and the input of the additional non-inverting current amplifier (11). |
 Bidirectional microwave amplifier / 2504895Bidirectionality of the amplifier is achieved by using circulators or directional couplers in place of switches at inputs of the device. |
 Differential amplifier with zero level of output static voltages / 2488954Differential amplifier with a zero level of output static voltages has a first (1) and a second (2) input transistor, a first (5) and a second (6) output bipolar transistor, a first (7) reference current source, a first (8-9) group of antiphase current outputs (8) and (9) of the device, a second group (10, 11) of antiphase current outputs (10) and (11) of the device. |
 Selective amplifier / 2488953Selective amplifier has a first (1) and a second (2) input transistor, the output (5) of the device, a first (8) balancing capacitor, a second (9) balancing capacitor, a first (12) and a second (13) additional frequency-setting resistor and a third (14) balancing capacitor. |
 Selective amplifier / 2488952Selective amplifier has a first input transistor, the base of which is connected to a signal source and the emitter is connected to a first power supply bus, a second input transistor, the emitter of which is connected to the first power supply bus and the collector is connected to a second power supply bus, a first balancing capacitor connected between the emitters of the first and second input transistors. The first balancing capacitor is connected in series to a first frequency-setting resistor; between the base of the second input transistor and the first power supply bus there is a second frequency-setting resistor, a second balancing capacitor, connected through alternating current in parallel to a second frequency-setting resistor, an additional transistor, the collector of which is connected to the output of the device and the base of the second input transistor, the base is connected to an additional voltage source, and the emitter is connected to the second power supply bus. The collector of the first input transistor is connected to the input of an additional current mirror, the collector output of which is connected to the first power supply bus, and the common emitter output is connected to the emitter of the additional transistor. |
 Selective amplifier with paraphase output / 2487466Selective amplifier with a paraphase output has a first (1) input transistor, the base of which is the input (2) of the device, a first (3) current-stabilising two-terminal device, a first power supply bus (4), a first (5) output transistor, a second (6) current-stabilising two-terminal device, a second (7) power supply bus, a second (8) input transistor, a second (9) output transistor, a third (10) current-stabilising two-terminal device, a secondary voltage source (11), a fourth (12) current-stabilising two-terminal device, a first (13) output of the device, a fifth (14) current-stabilising two-terminal device, a second (15) output of the device, a first (16) and a second (17) balancing capacitor, a sixth (18) current-stabilising two-terminal device, additional balancing capacitors (19) and a resistor (20), a first (21) and a second (22) additional transistor, a seventh (23) current-stabilising two-terminal device. |
 Microwave power amplifier / 2487465Microwave power amplifier has a sealed radiator housing with plug-in sealed adaptors for input and output of microwave signals, inside of which there is a microstrip printed-circuit board on which a two-stage amplifier is assembled; a high-power balance field-effect transistor 2P980BS is connected in the second stage of the amplifier; low-resistance input and output resistors of the balance field-effect transistor are matched by a symmetrical distributed communication line with smooth variation of characteristic impedance, and tunable capacitors are in form of printed-circuit boards made from foil-clad dielectric on which the foil is remove on one side. |
 Method for linearisation of microwave amplifier characteristics (versions) / 2487464Method for linearisation of characteristics of a microwave amplifier using a signal at envelope curve signals to suppress nonlinear distortions consists in that, in a microwave amplifier based on a travelling-wave tube or a klystron, a low-frequency correction signal of the envelope curve from the output of a modulator or the output of a detector is fed to the focusing electrode or the first anode of the travelling-wave tube or a klystron, and in a transistor microwave amplifier, a low-frequency correction signal of the envelope curve from the output of a modulator or the output of a detector is fed to the input of the transistor through circuits which determine the operating point. Amplifier characteristics consistently vary under the action of the signal, which is the envelope curve of the modulated microwave signal at the input of the amplifier. |
 Selective amplifier / 2485674Selective amplifier comprises an input (1), the first (2) correcting capacitor, the first (3) input transistor, the first (4) current-stabilising dipole, the first (5) bus of a power supply source, the second (6) input transistor, a source of auxiliary voltage (7), the first (8) resistor, the second (9) bus of a power supply source, the second (10), third (11) and fourth (12) resistors, the second (13) correcting capacitor, an output transistor (14), the second (15) current-stabilising dipole, an output of the device (17), an additional correcting capacitor (18), the third (19) current-stabilising dipole. |
 Selective amplifier / 2485673Selective amplifier comprises a current input (1), connected with the input of the first (2) current mirror, matched with the first (3) bus of a power supply source, the second (4) current mirror matched with the second (5) bus of a power supply source, the input of which is connected to the output of the first (2) current mirror. Besides, between the output of the second (4) current mirror and the first (3) bus of the power supply source there is the first (6) resistor connected. The output of the second (4) current mirror is connected by AC to the common bus of power supply sources via serially connected first (7) and second (8) correcting capacitors, the common unit of the first (7) and second (8) correcting capacitors via the second (9) resistor is connected to the input (10) of the first (11) current amplifier, the output (12) of which is connected to the input of the first (2) current mirror, besides, the common unit of the first (7) and second (8) correcting capacitors via the third (13) resistor is connected with the input (14) of the second (15) current amplifier. |
 Output cascade of rapid action operational amplifier / 2309528Device contains first output transistor (1), collector of which is connected to load (2) of output cascade, emitter - through first auxiliary resistor (3) is connected to first power bus (4), and the base is connected to first source of support current (5) and through first directly shifted p-n transition of transistor (6) is connected to first input (7) of output cascade, where between first input of output cascade and first bus of power supply (4) the second auxiliary resistor (8) is coupled, the circuit also includes first additional transistor (9), base of which is connected to first input (7) of output cascade, the collector is connected to load (2) of output cascade, and emitter is connected to first bus of power source (4). |
 Method of prevention of static electricity discharge formation and device for its implementation / 2326493Invention is related to the sphere of instrument making and may be used for protection against static electricity in different industries. Technical result is expansion of functional possibilities. In order to achieve this result prior to air supply to protected object it is affected by flow of alpha-particles. Then by permanent electric field of necessary index the laminar air flow is created and supplied in the premises to objects, on which the static electricity discharges may be created. In laminar flow the free electrons and air ions of required polarity are created. Ion concentration is brought to the value, which is necessary for prevention of static discharge. Device consists of ventilation unit, ionising chamber with source of alpha-particles, extracting air duct. In the chamber between the alpha-particles source and air duct across the air flow two mesh electrode are installed. For prevention of positive discharge of static electricity the first on the course of air flow the electrode is connected to the negative output of permanent voltage source, the positive output of which is grounded, and the second electrode is connected to the positive output of permanent voltage source. |
 Low-noise shf balanced amplifier / 2337468Low-noise SHF balanced amplifier includes two amplifiers connected between input and output 3 dB directional couplers connected in cascade on linked microstrip lines of Lange bridge-type interdigital structure. Central frequency of input directional coupler is higher than central operation frequency of balanced amplifier. Input directional coupler features link length L against central operation frequency of balanced amplifier, meeting the condition where λ is wavelength in microstrip line relating to central operation frequency of balanced amplifier, with absolute link factor for central frequency of input directional coupler is defined by formula |
 Differential amplifier with low-resistance inputs / 2383099Invention relates to radio engineering and communication and can be used as a device for amplifying high-frequency analogue signals in analogue microcircuits for different functional purposes (for example in communication line drivers, operational amplifiers (OP), high-speed comparators of two voltage values etc). The differential amplifier (DA) with current inputs has first (1) n-p-n and second (2) p-n-p input transistors (T) whose emitters are connected to corresponding first (3) and second (4) current inputs of the DA, a first (5) auxiliary p-n-p T whose collector is connected to the base of the first (1) n-p-n input transistor, a second (6) n-p-n auxiliary transistor whose collector is connected to the base of the second (2) n-p-n input transistor. The base of the first (5) p-n-p auxiliary T is connected to the first (7) bias voltage source, and the emitter is connected to the bus of the first (8) power supply (PS) through a first (9) auxiliary two-terminal circuit. The base of the second (6) n-p-n auxiliary T is connected to the second (10) bias voltage source, and the emitter is connected to the bus of the second (11) PS through a second (12) auxiliary two-terminal circuit. Collectors of the second (5) auxiliary p-n-p T and the second (6) auxiliary p-n-p T are connected to each other through alternating current. The collector of the first (1) n-p-n input T is connected to the emitter of the first (5) p-n-p auxiliary T, and the collector of the second (2) p-n-p input T is connected to the emitter of the second (6) auxiliary n-p-n T. |
 Solid-state power amplifier / 2416872Device includes preliminary amplifier 1 the input of which is amplifier input, and output is connected to input of divider 2 of power 1/N, the outputs of which are connected through modules 7 of phase correction to inputs N of amplifiers 3 of the channel. Outputs of amplifiers 3 of the channel are connected through coaxial-waveguide transitions 11 to inputs of adder 4 of power N/1, to the outlet flange of which there connected through directed brancher 12 is detector head 8. Output of detector head 8 and input of module 5 of address disconnection of the channel amplifiers (ADCA) is connected to bi-directional external control bus 10. Output of module 5 of ADCA is connected to control input of module 6 of distribution of modulating pulses, N outputs of which are connected to control inputs N of amplifiers 3 of the channel, N+1 output is connected to control input of preliminary amplifier 1, and signal input is connected to input bus 9 of modulating pulse. |
 Selective amplifier / 2461955In selective amplifier the collector of input transistor is connected to the input of current mirror, emitter of input transistor is connected to the power source bus through current stabilising two-pole device, between emitters of input transistors there are sequentially connected additional corrective condenser and frequency specifying resistor. |
 Selective amplifier / 2465718In a selective amplifier, having two input transistors and two current mirrors, between the input of the device and the emitter of the input transistor there are series-connected additional resistors and balancing capacitors; the bases of the input transistors are connected to the output of the device; between the output of the device and the common power supply bus there is an additional resistor and a third balancing capacitor connected in parallel through alternating current. |
 Broadband current amplifier / 2467468Invention relates to radio engineering and communication and can be used as an analogue signal amplifier, in design of analogue microcircuits of various purposes (e.g. microwave current amplifiers, signal mixers and multipliers etc). The broadband current amplifier includes a first (15) and a second (16) additional transistor, whose bases are connected to an auxiliary voltage source (8); the emitter of the first (15) additional transistor is connected the first (2) input of the device; the emitter of the second (16) additional transistor is connected to the second (6) input of the device; the collector of the first (15) additional transistor is connected to the base of the second (9) input transistor and a first (17) additional load circuit; the collector of the second (16) additional transistor is connected to the base of the fourth (10) input transistor and a second (18) additional load circuit. |
 Selective amplifier / 2467469Present invention relates to radio engineering and communication and can be used in devices for microwave filtration of radio signals of cellular communication systems, satellite television, radar etc. In some cases, the invention enables to reduce total power consumption and realise a high-quality selective microwave device with f0=1-5 GHz. To this end, the selective amplifier has a signal source (1) connected to the input (2) of the device, a first (3) input transistor, whose collector is connected through a first (4) current-stabilising two-terminal device to the first (5) power supply bus and the input of an additional current mirror (6), the current output of which is connected through a first (7) frequency-setting resistor to the first (5) power supply bus, a first (8) balancing capacitor, connected through alternating current in parallel to the first (7) frequency-setting resistor, a second (9) current-stabilising two-terminal device, connected between the emitter of the first (3) input transistor and the second (10) power supply bus, a second (11) input transistor. Between the emitter of the first (3) and second (11) input transistors, there are series-connected second (12) balancing capacitor and second (13) frequency-setting resistor, the base of the second (11) input transistor is connected to the input (2) of the device, the collector is connected to the first (5) power supply bus, and the emitter is connected to the second (10) power supply bus through a third (14) current-stabilising two-terminal device, wherein a voltage repeater is connected between the output of the device and the base of the first (3) input transistor. |
 Selective amplifier / 2468498Selective amplifier has a signal source (1), a first input transistor (2), a first current stabilising two-terminal device (3), a first power supply bus (4), a second power supply bus (5), a second input transistor (6), a first load resistor (7), a second current stabilising two-terminal device (8), a first balancing capacitor (9), a first frequency setting resistor (10), a second balancing capacitor (11), a third input transistor (12), a fourth input transistor (13), a third current stabilising two-terminal device (14), a fifth input transistor (15) base, a voltage source (16), a fourth current stabilising two-terminal device (17), a third balancing capacitor (18). |
FIELD: radio engineering, communication.
SUBSTANCE: invention relates to radio engineering and communication and can be used as a broadband signal amplifier, in analogue interfaces, analogue-to-digital converters, RC filters, instrumentation amplifiers etc. The multi-differential operational amplifier includes an input differential voltage-to-current converter, anti-phase current outputs, two-terminal loads, power supply buses, current outputs of the device, input transistors, an input transistor emitter, power sources, reference current sources, scaling resistors, the reference current sources are in form of controlled reference current sources with corresponding control inputs which are connected to the output of the stage for selecting the output in-phase voltage of the input differential voltage-to-current converter, wherein inputs of the stage for selecting the output in-phase voltage of the input differential voltage-to-current converter are connected to corresponding anti-phase current outputs of the input differential voltage-to-current converter.
EFFECT: high coefficient of attenuation of input in-phase signals of a multi-differential operational amplifier, wider operating frequency range, low temperature drift of the zero offset emf, high input cut-off voltage.
4 cl, 13 dwg
The invention relates to the field of radio engineering and communication and can be used as a device to gain bandwidth signals, in the structure of analog interfaces, analog-to-digital converters, RC-filters, instrumentation amplifiers, etc.
Known scheme of the so-called multidifferential operational amplifiers (MOU)with multiple entries and the total output of the lower level - buffer cascade [1-8]. Due to the small energopotrebleniem MOU became the basis of many microelectronic devices of new generation [1-8].
The closest prototype of the proposed device (Fig 1) is multidifferential operational amplifier described in US patent no 4835488, fig.3. It contains the first 1 input differential Converter "voltage-current", the first 2 and 3 second phase with current output of which is connected with relevant first 4 and 5 second phase current outputs second 6 input differential Converter "voltage-current", the first 7 dvuhgolosyj load is connected between the first 8 bus power supply and the first 2 current output 1 input differential Converter "voltage-current"which is connected with the first 9 output device, the second 10 dvuhgolosyj load, 11 second output device, and the first 1 input differential Converter "voltage-current" includes the first 12 and 13 second input transistors, base which is connected with the first group 14, 15 relevant anti-phase inputs 14, 15 device, the emitter of the first 12 input transistor is connected with the second 16 bus power supply through the first 17 reference current emitter second 13 input transistor is connected with the second 16 bus power supply through the second 18 the reference current, between the emitters of the first 12 and 13 second input transistors included the first 19 scaling resistor, and the second 6 input differential Converter "voltage-current" includes the second 10 dvuhgolosyj load is connected between the first 8 bus power supply and the second 3 current output 1 input differential Converter "voltage-current", connected with the second 5 current output of the second 6 input differential Converter "voltage-current" 11 and the second output device, and the second 6 input differential Converter "the voltage-current" includes third 20 and the fourth 21 input transistors, the bases of which are connected with the second group (22, 23) out-of-phase inputs 22, 23 device emitter third 20 input transistor is connected with the second 16 bus-power supply through a third 24 reference current emitter fourth 21 input transistor is connected with the second 16 bus power supply through the fourth 25 reference current, between the emitters of the third 20 and the fourth 21 input transistors included 26 second scaling resistor.
A significant disadvantage Doo figure 1 is that it has a comparatively low attenuation of the input common-mode signals that affects the precision parameters of analog interfaces based on it.
The main objective of the invention consists in increasing the coefficient of attenuation of the input common-mode signals MOU, as well as the extension of the frequency range, the lower the temperature drift EMF zero offset, the increase in the input boundary stresses.
The task is achieved that multidifferential operational amplifier figure 1, containing the first 1 input differential Converter "voltage-current", the first 2 and 3 second phase with current output of which is connected with the corresponding first 4 and the second 5 counter-current outputs of the second 6 input differential Converter "voltage-current", the first 7 dvuhgolosyj load is connected between the first 8 bus power supply and the first 2 current output 1 input differential Converter "voltage-current", United with the first 9 output device, the second 10 dvuhgolosyj load, 11 second output device, and the first 1 input differential Converter "voltage-current" includes the first 12 and 13 second input transistors, the base of which is connected with the first group 14, 15 relevant out-of-phase inputs 14, 15 device, the emitter of the first 12 input transistor is connected with the second 16 bus power supply through the first 17 reference current emitter second 13 input transistor is connected with the second 16 bus power supply through the second 18 reference current, between the emitters of the first 12 and 13 second input transistors included the first 19 scaling resistor, and the second 6 input differential Converter "voltage-current" includes the second 10 dvuhgolosyj load is connected between the first 8 bus power source and the second 3 current output of the first 1 input differential Converter "voltage-current", connected with the second 5 current output of the second 6 input differential Converter "voltage-current" 11 and the second output device, and the second 6 input differential Converter "voltage-current" includes third and 20 fourth 21 input transistors, the bases of which are connected with the second group (22, 23) out-of-phase inputs 22, 23 device emitter third 20 input transistor is connected with the second 16 bus-power supply through a third 24 reference current emitter fourth 21 input transistor is connected the second 16 bus power supply through the fourth 25 reference current, between the emitters of the third 20 and the fourth 21 input transistors included 26 second scaling resistor, there are new elements and connections of the first 17 and the second 18 sources of reference current is made in the form of managed sources of reference current with the appropriate control inputs 27 and 28, which is connected to the output cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current, with inputs cascade 29 selection of the output common-mode voltage of the first 1 input differential Converter "voltage-current" is connected with the corresponding first 2 and 3 second phase current outputs 1 input differential Converter "voltage-current".
The amplifier circuit prototype presented in figure 1. Figure 2 shows the claimed MOU in accordance with subparagraphs 1-4 of the claims.
Figure 3 presents a schematic diagram of the claimed device on CMOS transistors.
The scheme is studied by the authors of MOU (figure 2) in the environment of computer modeling Cadance Virtuoso on models SiGe transistors are presented in figure 4.
Figure 5 shows the frequency dependence of gain common-mode voltage MOU figure 4 for a single differential gain.
Figure 6 shows a graphic to define the boundary voltage the input common-mode signal MOU figure 4, within which ensures a high level of attenuation of the input common-mode voltage.
Figure 7 presents the amplitude-frequency characteristic of MOU (figure 4), and on Fig - its phase-frequency characteristic.
Figure 9 shows the amplitude-frequency characteristic of MOU figure 4 mode nennwertlose of voltage follower.
Figure 10 shows the charts to determine the maximum slew rate output voltage MOU figure 4, and figure 11 - its amplitude characteristics.
On Fig shows the temperature dependence EMF offset MOU (figure 4).
Figure 2 in accordance with claim 2 24 third and fourth 25 sources supporting current second 6 input differential Converter "voltage-current" is made in the form of managed sources supporting current with the appropriate control inputs 30 and 31, which is connected to the output cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current".
Furthermore, figure 2 in accordance with section 3 of the claims as the first 12, 13 second, third, 20 and the fourth 21 input transistors used compound transistors in the form of field-effect transistors, the origins of which correspond to the emitters, sewage - collectors, and shutters - bases bipolar transistors.
Figure 2 in accordance with paragraph 4 of the claims outputs 11 and 9 of the device are also associated with additional inputs differential buffer cascade 32.
Consider the work multidifferential operational amplifier (MOU) figure 2.
Input signals containing common-mode and differential components, served on the base of the first 12 input transistor and the second 13 input transistor. This raises the increment currents i, 12 , 13 , and through the use of the first 19 scaling resistor connected between the outputs of the first 17 and the second 18 sources of reference current, there is a partial deduction phase and the sum differential components of the increments of the currents i 12 i 13 , resulting in the first 7 and the second 10-two-terminal loads occur voltage drops summarized differential and left after partial deduction common-mode components increments currents i 12 i 13.
The presence of the cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current" allows to create two paths negative feedback:
1. The first the circuit. "The first 2 output 1 input differential Converter "voltage-current - output cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current" is the control input 27 of the first 17 reference current source output of the first 17 reference current source - emitter first 12 input transistor collector of the first 12 input transistor";
2. The second circuit. "The second 3 output 1 input differential Converter "voltage-current - output cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current" is the control input 28 the second 18 reference current source output of the second 18 reference current source - emitter second 13 input transistor collector second 13 input transistor".
These contours negative feedback provide additional common mode rejection components due to their summation cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current".
At that, these paths do not affect differential (antiphase) components the voltage drops on the first 7 and the second 10-two-terminal pressures from zero result, when combined cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current".
Similarly describes the principle of operation of the first 1 input differential Converter "voltage-current with the first 7 and 10 second a two-terminal loads and cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current" functions the second 6 input differential Converter "voltage-current".
After this, the differential gain and attenuation-phase components of the stress on the first 7 and the second 10-two-terminal loads with additional differential buffer cascade 32, the output of which is the output of the MOU.
Analysis scheme allows you to define the coefficients of transmission on each channel MOU
K 1 + ( j ω ) = u In s x . ∑ ( j ω ) u 15 ( j ω ) = - K 1 - = - u In s x . ∑ ( j ω ) u 14 ( j ω ) = ( S E. 12 ( j ω ) Z n 7 + S E. 13 ( j ω ) Z n 10 ) K ( j ω ) , ( 1 ) K 2 + ( j ω ) = u In s x . ∑ ( j ω ) u 23 ( j ω ) = - K 2 - = - u In s x . ∑ ( j ω ) u 22 ( j ω ) = ( S E. 20 ( j ω ) Z n 7 + S E. 21 ( j ω ) Z n 10 ) K ( j ω ) . ( 2 )Here's a (jω) is equivalent to the steepness of the i-th transistor
S E. 12 ( j ω ) = S 12 ( j ω ) 1 + S 12 ( j ω ) / S 13 ( j ω ) + S 12 ( j ω ) R 19 ≈ 1 R 19 , ( 3 ) S E. 13 ( j ω ) = S 13 ( j ω ) 1 + S 13 ( j ω ) / S 12 ( j ω ) + S 13 ( j ω ) R 19 ≈ 1 R 19 , ( 4 )where S i is the steepness of the i-th transistor, R j - resistance of the j-th scaling resistor of the schema To - differential gain additional differential buffer cascade 32.
Thus attenuation coefficients of the input common-mode voltage of the first 1 and the second 6 input differential converters "voltage-current", respectively, are determined by the expression
K about with with n 1 = ( 1 1 + S 13 R i 17 1 + R i 17 ( S 17 + S 24 ) K c - 1 1 + S 12 R i 18 1 + R i 18 ( S 18 + S 25 ) K with ) - 1 , ( 7 ) K about with with n 2 = ( 1 1 + S 21 R i 24 1 + R i 24 ( S 24 + S 17 ) K with - 1 1 + S 20 R i 25 1 + R i 25 ( S 25 + S 18 ) K with ) - 1 , ( 8 )where R ij - differential output resistance of the j-th transistor or reference current source(17, 18, 24, 25), K c - gain voltage cascade 29 selection of the output common-mode voltage 1 input differential Converter "voltage-current".
IfR i17 (S 17 +S 24 )C K >>1, R i18 (S 18 +S 25 )c K >>1 and R i24 (S 24 +S 17 )C K >>1, R i25 (S 25 +S 18 )C K >>1,then you find that:
K about with with n 1 = ( 1 1 + S 13 ( S 17 + S 24 ) K C - 1 1 + S 12 ( S 18 + S 25 ) K C ) - 1 . ( 9 ) K about with with n 2 = ( 1 1 + S 21 ( S 24 + S 17 ) K C - 1 1 + S 20 ( S 25 + S 18 ) K C ) - 1 . ( 10 )So by the way, in the MOU 2 coefficients K ASSN , K ASSN
are minimized by the depth of input into the scheme feedback (K C ) without changing the differential coefficients of transmission channels (1) and (2). Feature of this scheme is a rigid correlation their gain channels the differential conversion of an input signal
K 1 + K 2 + = K 1 - K 2 - = R 26 R 19 . ( 11 )Therefore, the use of this MOU in the devices with feedback
provides through R 19 and R 26 necessary correlation and coordination local transfer functions of complex electric circuits.
As is seen from (1), (2) increased Z H7 , Z H10 and symmetry of channels allows to reduce the effect of difference boundary stresses active circuit elements. In particular, zero drift amplifier open condition MOU is determined by the expression
U D. R = U D. R 1 K , ( 12 )where U DR1 - zero drift input dual differential cascade MOU, K - differential gain additional differential buffer cascade 32.
In addition boundary voltage input circuits of MOU, which is provided by their linear range, increase at the expense of application of these scaling resistors (R 19 , R 26 ). This leads to an increase in the rate of output voltage rise MOU and stabilizes the modes of operation of the input transistors 12, 13, 20 and 21. Indeed, the boundary voltage 1 first and second 6 input differential converters "voltage-current" accordingly defined by the following expressions
U g R 1 ≈ U g R .12 * + U g R .13 * + R 19 I 0 , ( 13 ) U g R 6 ≈ U g R .20 * + U g R .21 * + R 26 I 0 , ( 14 )where I 0 =I 17 =18 I =I 24 =25 I - static current sources supporting current 17, 18, 24, 25.
U g R . i *- boundary input voltage of the i-th transistor
( U g R . i * ≈ 25 m In ) .The increase boundary stresses (13) and (14) by resistors R 19 and R 26 reduces the influence of error manufacturing input transistor converters 12, 13; 20, 21 on currents equivalent loads and, therefore, the drift. As can be seen from formula
i 12, ( 13 ) ( Δ U * ) = S 12, ( 13 ) Δ U * 1 + S 12, ( 13 ) R 19 + S 12, ( 13 ) / S 13, ( 12 ) ( 15 ) i 20, ( 21 ) ( Δ U * ) = S 20, ( 21 ) Δ U * 1 + S 20, ( 21 ) R 19 + S 20, ( 21 ) / S 21, ( 20 ) , ( 16 )where ΔU I - technological difference boundary stresses input converters, this increases the stability of the modes of operation of active elements of the input circuits, the defence Ministry.
The results of computer simulation of the defence presented in diagrams 5-12? confirm that the proposed device has a higher value of attenuation of the input common-mode signals and is characterized by the improved values of other parameters.
The proposed MOU can be used in structure of broadband interfaces, sensor and measuring systems.
THE BIBLIOGRAPHIC LIST
1. Patent US 4835488, fig.3.
2. The patent application US 2008/0064359, fig.4.
3. Patent US 7205799, fig.4.
4. Patent application WO 2007/022705.
5. Patent US 7271647.
6. The patent of the FRG 2146418.
7. The patent application US 2003/0084377.
8. Patent US 5045804, fig.2.
1. Multidifferential operational amplifier that contains the first (1) differential input inverter voltage-current", the first (2) and second (3) counter-current outputs of which are connected with the corresponding first (4) and second (5) anti-phase current the outputs of the second (6) input differential Converter "voltage-current", the first (7) dvuhgolosyj load is connected between the first (8) bus power supply and the first (2) a current output of the first (1) input differential Converter "voltage-current"which is connected with the first (9) the output of the device, the second (10) dvuhgolosyj load, the second (11) output device, and the first (1) differential input inverter voltage-current" contains the first (12) and the second (13) of the input transistors, the base of which is connected with the first group (14), (15) corresponding antiphase inputs (14), (15) device, the emitter of the first (12) of the input transistor is connected with a second (16) bus power supply through the first (17) reference current emitter second (13) of the input transistor is connected with a second (16) bus power supply through the second (18) reference current, between the emitters of the first (12) and the second (13) input transistors included first (19) scaling resistor, and the second (6) input differential Converter "voltage-current" includes the second (10) dvuhgolosyj load is connected between the first (8) bus power source and the second (3) current the release of the first (1) input differential Converter "voltage-current", connected with a second (5) a current output of the second (6) input differential Converter "voltage-current" and the second (11) the output device, and the second (6) input differential Converter "voltage-the current " includes third (20) and fourth (21) input transistors, the bases of which are connected with the second group (22, 23) out-of-phase inputs (22), (23) device, the emitter of the third (20) of the input transistor is connected with a second (16) bus power supply through the third (24) reference current emitter the fourth (21) of the input transistor is connected with a second (16) bus power supply through fourth (25) the reference current, between the emitters of the third (20) and fourth (21) input transistors enabled second (26) scaling resistor, wherein
the first (17) and second (18) sources of reference current is made in the form of managed sources supporting current with the appropriate control inputs (27) and (28), which is connected to the output cascade (29) the selection of the output common-mode voltage of the first (1) input differential Converter "voltage-current, with inputs cascade (29) the selection of the output common-mode voltage of the first (1) input differential Converter "voltage-current" is connected with the corresponding first (2) and the second (3) counter-current outputs of the first (1) input differential Converter "voltage-current".
2. Multidifferential operational amplifier according to claim 1, wherein the third (24) and fourth (25) sources supporting current second (6) input differential Converter "voltage-current" is made in the form of managed sources supporting current with the appropriate control inputs (30) and (31), which is connected to the output cascade (29) the selection of the output common-mode voltage of the first (1) input differential Converter "voltage-current".
3. Multidifferential operational amplifier according to claim 1, wherein the first (12), second (13), third (20) and the fourth (21) input
transistors are used compound transistors in the form of field-effect transistors, the origins of which correspond to the emitters, sewage - collectors, and shutters - bases bipolar transistors.
4. Multidifferential operational amplifier according to claim 1
or2, characterized in that the outputs (11) and (9) of the device associated with additional inputs differential buffer cascades (32).