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IPC classes for russian patent Selective amplifier with extended frequency band (RU 2517681):
Another patents in same IPC classes:
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Invention 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 / 2467469
Present 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.
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Selective 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).
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FIELD: radio engineering, communication.
SUBSTANCE: device includes a main operational amplifier, between the output and the inverting input of which a first frequency-dependent resistor is connected, first and second frequency-setting capacitors connected in series between the output of the main operational amplifier and its inverting input, a second frequency-setting resistor, the first lead of which is connected to the common node of the series-connected frequency-setting capacitors, an input voltage source, first and second power supply buses; the second frequency-setting resistor is connected between the common node of the first and second frequency-setting capacitors and the first power supply bus; the input voltage source is connected to the inverting input of an additional voltage-to-current converter, the non-inverting input of which is connected to the inverting input of the main operational amplifier; the common emitter circuit of the additional voltage-to-current converter is connected to the second power supply bus, and the current output of the additional voltage-to-current converter is connected to the common node of the frequency-setting capacitors.
EFFECT: wider frequency band of the selective amplifier by reducing the effect of gain-crossover frequency f1 of the main operational amplifier on the quasi-resonance frequency f0.
15 dwg
The present invention relates to the field of radio and communication and can be used in filtration devices radio, television, radar, etc.
In the tasks of separating high-frequency signals are now widely used integrated operational amplifiers (op amps) with elements of the RC-correction form of the amplitude-frequency characteristic of the resonance type [1-7]. However, the classical construction of such election amplifiers (in-amps) leads to a significant dependence of the main parameters (quality factor Q and frequency quasiresonance f0from the frequency of a single amplifier f1used OS. It is not possible to provide PS with ricochette OS. In this regard, it is highly important task search architectures selective amplifier having a weak dependence of the frequency of quasiresonance f0from f1used active elements (OS).
The closest prototype of the proposed device is a classic selective amplifier, known to specialists as the scheme Rauch [1-7], presented in the patent US 5.336.242 fig. 3. It contains the basic operational amplifier 1, between exit 2 and the inverting input of which included the first 3 customizability resistor, the first 4 and second 5 castorocauda capacitors, connected in series between the output of the 2 main one is sure of the amplifier 1 and its inverting input, the second 6 frequency control resistor, a first output of which is connected to a common node 7 consistently included the first 4 and second 5 frequency control capacitor, the input voltage 8, the first 9 and second 10 bus power sources.
A significant disadvantage of the known PS-prototype is that the frequency of quasiresonance f0its amplitude-frequency characteristics (AFC) essentially depends on the numerical values of the unity gain frequency f1OS.
The main objective of the present invention is to extend the frequency range Yiwu due to the weakening of the influence of the unity gain frequency f1the main OS (1) on the frequency of quasiresonance f0. This allows, in some cases, to implement high-quality polling the device is in the range of high and ultra-high frequencies on the type of OS with small values of f].
The problem is solved in that in the election amplifier with an extended frequency range 1, containing the main operational amplifier 1, between exit 2 and the inverting input of which included the first 3 customizability resistor, the first 4 and second 5 castorocauda capacitors, connected in series between the output 2 of the main operational amplifier 1 and its inverting input, the second 6 frequency control resistor, the first wypadkowego connected to a common node 7 consistently included the first 4 and second 5 frequency control capacitor, the source of the input voltage 8, the first 9 and second 10 bus power sources, there are new elements and communications - 6 second frequency control resistor connected between a common node 7 of the first 4 and second 5 frequency control capacitor and the first 9-bus power supply, the input voltage 8 is connected with the inverting input of the Converter "voltage-current" 11, the non-inverting input of which is connected with the inverting input of the main operational amplifier 1, the common emitter circuit of the additional Converter "voltage-current" 11 connected to a second 10 bus power supply and current output 12 additional inverter voltage the current" 11 connected to a common node 7 of the first 4 and second 5 frequency control capacitor.
The amplifier circuit of the prototype shown in the drawing figure 1. In the drawing figure 2 presents the diagram of the inventive device in accordance with the invention.
In the drawing figure 3 presents Yiwu figure 2 with the first example of a practical implementation of the Converter "voltage-current" 11 on the basis of differential cascade (items 13, 14, 15).
In the drawing figure 4 shows a diagram PS 3 with the input RC circuit (items 16, 17), which is entered for the additional attenuation of the input signal in the low frequency range (the second implementation of the Converter 11).
In the drawing Fig is a diagram Yiwu figure 2 with the third option of the run input of the inverter 11 "voltage-current" (items 18, 19, 20, 21, 22).
Drawing 6 shows a diagram of the PS 2 with the fourth alternative implementation, the input of the inverter 11 "voltage-current" (elements 23, 24, 25, 26, 27).
In the drawing Fig.7 presents Yiwu 6, whose frequency control resistor 6 includes p-n junction, managed static current Iy=var (32), and in the drawing Fig presents Yiwu 6, in which the parameters (Q, K0depend on dvukhpolosnykh 30:I30=Ivar(30).
In the drawing, figure 9 presents a selective amplifier 2 with varicaps are given 5, 4 (capacitors 5, 4)changing the frequency of quasiresonance f0under the action of the control voltage Uy.
In the drawing figure 10 shows a diagram of the PS 6 in the environment of computer simulation Cadence on models integrated SiGe transistors.
In the drawing 11 shows the logarithmic amplitude-frequency characteristic Yiwu figure 10 in the frequency range 100 MHz÷10ggts, which is obtained by a circuit simulation in the Cadence environment on SiGe transistors.
In the drawing Fig shows the amplitude-frequency characteristic Yiwu figure 10 (LATCH) with input RC filter in the frequency range 100 kHz÷HTC.
In the drawing Fig shows a diagram Yiwu 6 in the Cadence environment for the case when the non-inverting input of the Converter "voltage-current" 11 is not connected with the inverting input of the main operational amplifier the in this scheme excluded proposed in the application circuit compensation f1OS (1) on the parameters of the selective amplifier.
In the drawing Fig shows a diagram Yiwu 6 in the Cadence environment for the case when the non-inverting input of the Converter "voltage-current" 11 is connected to the inverting input of the main operational amplifier. I.e. in this scheme included in the proposal chain compensation unity gain frequency fj of the main OS (1) on the parameters of the selective amplifier.
In the drawing Fig shows the amplitude-frequency characteristics of the compared schemes PS: curve 1 corresponds to the diagram Fig, i.e. Yiwu without a compensation circuit; figure 2 is cleared for the case when the scheme Yiwu Fig applies the ideal operational amplifier 1 with an infinitely large values of f1; figure 3 corresponds to the diagram Fig, which introduced the compensation circuit in accordance with the invention.
Analysis of the drawing Fig shows that the proposed device has a significantly lower impact frequency unity gain shelter on the frequency of quasiresonance f0and the Q. this inventive scheme is similar in its properties to the ideal (graph 2).
Selective amplifier with an extended frequency range contains the main operational amplifier 1, between exit 2 and inverting I the house which included the first 3 customizability resistor, the first 4 and second 5 castorocauda capacitors, connected in series between the output 2 of the main operational amplifier 1 and its inverting input, the second 6 frequency control resistor, a first output of which is connected to a common node 7 consistently included the first 4 and second 5 frequency control capacitor, the input voltage 8, the first 9 and second 10 bus power sources. The second 6 frequency control resistor connected between a common node 7 of the first 4 and second 5 frequency control capacitor and the first 9-bus power supply, the input voltage 8 is connected with the inverting input of the Converter "voltage-current" 11, the non-inverting input of which is connected with the inverting input of the main operational amplifier 1, the common emitter circuit of the additional Converter "voltage-current" 11 connected to a second 10 bus power supply and current output 12 additional Converter "voltage-current" 11 connected to a common node 7 of the first 4 and second 5 frequency control capacitor.
Yiwu figure 3 contains the first version of the construction of the input Converter "voltage-current" And the transistors 13, 14 and the reference voltage 15.
In the scheme of Yiwu figure 4 Converter "voltage-current" 11 contains elements 13, 14, 15, 16 and 17.
In the scheme of Yiwu figure 5 Converter "voltage-current" 1 performed on the elements 18, 19, 20, 21 and 22.
To increase the level of attenuation of the input signals in the low frequency range in the scheme Yiwu 6 use the Converter "voltage-current" 11 on the elements 23, 24, 25, 27, 27.
In PS 7, which belongs to the class of control amplifiers, as a frequency control resistor 6 is used differential resistance of the additional p-n junction, which is controlled by the current dvukhpolosnykh 32 (Iy=var).
In the scheme Fig management options Yiwu is the current change dvukhpolosnykh 30.
The feature of this circuit Fig.9, in which the input Converter "voltage-current" 11 implemented on the elements 32, 33, 34, 35, 36, is that as capacitors 4 and 5 here are the varicaps are given 5, 4, the voltage of which depends on the control voltage Uythat allows you to change settings Yiwu.
Consider the circuit of figure 2.
The complex transmission coefficient PS 2 as the ratio of the output voltage (output 13) to the input voltage andI(1) is determined by a formula, which can be obtained by using methods of analysis of electronic circuits:
where f is the frequency of the input signal;
f0frequency quasiresonance electoral amp;
Q - q AFC electoral amp;
To0the gain of the DUT at a frequency of quasiresonance f0.
It is possible to show analytically and by computer simulation (see drawing Fig)that the proposed selective amplifier 2 is characterized by a weak influence of the unity gain frequency f1used operational amplifier 1 on the main parameters of the PS - q and frequency unity gain. This allows ceteris paribus to get a wider range of operating frequencies Yiwu when using relatively low-frequency operational amplifiers (1).
Represented in the drawings, 11, Fig, Fig the simulation results Yiwu confirm these properties of the proposed schemes.
BIBLIOGRAPHIC LIST
1. Patent US 4.189.681 fig. 1.
2. Patent US 6.404.279 fig. 1.
3. Patent US 7.081.788 fig. 6.
4. Patent US 6.268.766 fig. 4.
5. Patent US 5.336.242 fig. 3.
6. Patent US 6.492.865 fi. 4.
7. Patent US 7.838.809 fig. 13c.
Selective amplifier with an extended frequency range that contains the main operational amplifier (1), between the output of (2) and inverting input of which is enabled first (3) customizability resistor, the first (4) and second (5) castorocauda capacitors, connected in series between the output (2) of the main operational amplifier (1) and its inverting input, the second (6) frequency control resistor, a first output of which is connected to a common node (7) series of the first (4) and second (5) the frequency control capacitor, the input voltage (8), the first (9) and second (10) bus power supply, characterized in that the second (6) frequency control resistor connected between a common node (7) first (4) and second (5) the frequency control capacitor and the first (9) bus power supply, input voltage (8) connected to the inverting input of the Converter "voltage-current" (11), the non-inverting input of which is connected with the inverting input of the main operational amplifier (1), common emitter circuit of the additional Converter "voltage-current" (11) connected to the second (10) bus power supply and current output (12) additional Converter "voltage-current" (11) connected to a common node (7) first (4) and second (5) the frequency control of the condenser base is impressive.
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