Low-noise broadband amplifier dc

 

(57) Abstract:

The invention relates to electronics, instrumentation, automation and can be used in the preliminary stages of devices linear current amplification. The device includes input and output push-pull stages are performed on the MOS transistors (1-4) having a different structure and connected in the circuit, respectively, common gate, common source, current source MOS transistors (5, 6), resistors (11-22). Effect: reduce input capacitance and noise. 1 Il.

The invention relates to electronics, instrumentation, automation and can be used in the preliminary stages of devices linear current amplification.

Known current amplifier operating over a wide dynamic range and low power consumption, made in push pull circuit with MOS transistors included in each arm on the scheme, the total gate - common origin and having a different structure [U.S. patent N 6014056, CL H 03 F 3/26, published. 11.01.2000].

However, the known current amplifier does not have a high accuracy when transmitting a high frequency signal. The closest technical solution is a low-noise broadband will enhance what about the common-gate, having a different structure in the chain of sinks which are included respectively in the first and second current sources connected to the tire, respectively, positive and negative supply voltage, and an output push-pull cascade [U.S. patent N 4893091, CL H 03 F 34/45, 3/30, published. 09.01.1990, Fig. 4].

The disadvantages of this known device is the high input capacity and high noise parameters, reducing the precision high-frequency current amplifier.

The present invention is the reduction of input capacitance and noise through the use of the booster coherent way of self-compensation of noise, the essence of which consists in the following. In the amplifier for controlling series-connected output transistors are automatically generated own coherent noise signals, but in opposition to their own noises. As a result of this formation of the control signals at the output of series-connected output transistors in opposite phase coherent signals are subtracted and the load does not, which is fully equivalent to the reduction of internal noise of the amplifier as a whole.

Thus, the problem is solved in that M and second MOS transistors, included in the circuit with a common-gate having a different structure in the chain of sinks which are included respectively in the first and second current sources connected to the tire, respectively, positive and negative supply voltage, and an output push-pull stage, push-pull output stage is executed in the third and fourth MOS transistors, connected in circuit with a common source and having a different structure, the first and second current sources are made respectively on the fifth and sixth MOS transistors, connected in circuit with a common source and having a structure respectively of the third and fourth MOS transistors, in the circuit of the drain and source of each MOS transistor entered the appropriate resistors and the junction point of the resistors in the circuits drains of the first and fifth MOS transistors connected to the gate of the third MOS transistor, the connection point of the resistors in the circuits drains of the second and sixth MOS transistors connected to the gate of the fourth MOS transistor, the connection point of the resistors in the circuits of the origins of the first and second MOS transistors is input, the connection point of the resistors in the circuits drains of the third and fourth MOS transistors output low-noise broadband amplifier current data with first to fourth pramosone diodes, moreover, the connection point of the second and third pramosone diodes connected to a common bus, the connection point of the first and second pramosone diodes connected to the gates of the first and fifth MOS transistors, and the connection point of the third and fourth pramosone diodes connected to the gates of the second and sixth MOS transistors.

The drawing shows a circuit diagram of a low noise broadband amplifier current.

The amplifier circuit includes first to sixth MOS transistors 1 to 6, first to fourth pramosone diodes 7 to 10, the resistors 11 - 22, the positive bus 23, a negative 24 supply voltage, a common bus 25, the inlet 26 and the outlet 27.

The amplifier operates as follows.

The input signal, entering the inlet 26, through the combined outputs of the MOS transistors 1, 5 and 2, 6 is transmitted to the control electrodes of the respective output complementary MOS transistors 3 and 4. Eventually the load which is connected between the connection points of the output MOS transistors 3 and 4 (connected through resistors 20 and 21), produces an amplified output signal. The amplitude of the output signal can be adjusted by the amount of negative feedback, cotravelers noise allows you to achieve your goal of reducing the input capacitance and noise of the amplifier and thereby increase its precision.

Low-noise broadband amplifier DC containing the input push-pull stage, performed on the first and second MOS transistors included in the circuit with a common-gate having a different structure in the chain of wastewater which included, respectively, the first and second current sources connected to the tire, respectively, positive and negative supply voltage, and an output push-pull stage, characterized in that the push-pull output stage is executed in the third and fourth MOS transistors, connected in circuit with a common source and having a different structure, the first and second current sources are made, respectively, on the fifth and sixth MOS transistors, connected in circuit with a common source and having a structure, respectively, the third and fourth MOS transistors in the circuit of the drain and source of each MOS transistor entered the appropriate resistors and the junction point of the resistors in the circuits drains of the first and fifth MOS transistors connected to the gate of the third MOS transistor, the connection point of the resistors in the circuits drains of the second and sixth MOS transistors connected to the gate of the fourth MOS transistor, the connection point of the resistors in the circuits of the origins of the first and second MOS implemented what hodom low-noise broadband amplifier current, between the trunks of the positive and negative supply voltage which is introduced sequentially connected to the first through fourth pramosone diodes, and the connection point of the second and third pramosone diodes connected to a common bus, the connection point of the first and second pramosone diodes connected to the gates of the first and fifth MOS transistors, and the connection point of the third and fourth pramosone diodes connected to the gates of the second and sixth MOS transistors.

 

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