SU1406750A1 - Zero-level stabilized pulsed amplifier - Google Patents

Abstract

The invention can be used in radar, ranging and nuclear physics. The purpose of the invention is to expand the functionality of the device. The pulse amplifier contains a DC amplifier 1, a limiting resistor 2, an integrator 3 and diodes 7 and 8. The introduction of an operational amplifier 4, which forms a nonsynverting amplifier configuration with a feedback resistor 5 and a resistor 6, provides a two-polar mode of operation of the device. 1 il.

Description

ABOUT)

vi

01

The invention relates to a pulse technique and can be used in radar, ranging and nuclear physics.

The aim of the invention is to enhance the functionality of the amplifier by providing a dual polar mode of operation.

The drawing shows the functional scheme of the proposed device.

A zero-level impulse amplifier consists of a DC amplifier 1, covered with negative feedback through, a limiting resistor 2 and an integrator 3 The common point of the integrator and a limiting resistor is connected to the input of an operational amplifier 4, first with a reverse resistor 5 The connection and the resistor 6 form the configuration of a non-inverting amplifier. The input of the operational amplifier is shunted by anti-parallel on-25 diodes 7, 8.

Resistor values must satisfy ratios:

R

oGy

 R input / T

where is the output voltage of the pulse amplifier;

ABOUT

duration of amplified

pulses;

V, k is the maximum rate of rise of the output voltage of the operational amplifier and its gain; R, oCr resistances of resistors connecting the inverting input of the operational amplifier with the ground and with its output; 45 Rj is the input resistance of the operational amplifier; K - resistance of the limiting resistor.

In order to increase the degree of suppression of the pulse component of the amplified signal fed to the integrator, two counter-parallel-connected diodes are connected between the inverting and non-inverting inputs of the operational amplifier.

The amplifier works as follows.

In the absence of HMrry.TfiCHoi o the signal on the hg, on the go of the amplifier 1 P (and the current of the current (the amplifier A is in linear mode, its equivalent resistance on the N (the inverting input R l ReiroA therefore, influence of the amplifying device. The DC amplifier is covered by deep negative feedback through the limiting resistor and the integrator, which ensures a clear fixation of the zero level at its output. The appearance of a pulse signal of any polarity at the output of the amplifier An 1 dc current that meets the overload condition of an op amp:

R

R off

brings it to nonlinear mode of operation. The negative feedback circuit spanning the feedback amplifier through the feedback resistor 5 is discharged, and the equivalent input resistance becomes equal to the resistance Rd. Since the resistance Rg RgxoA I during the nonlinear operating mode of the operating accelerator does not receive a signal at the integrator input, which leads to the absence of a charge on its capacitance of the pulse component of the signal. As a result, the range of amplitudes and frequencies of the amplified pulses are spread. At the end of the pulse signal, the operational amplifier returns to linear mode in a time approximately equal to the duration of the amplified pulse, and the whole device is again ready for operation, I

The degree of suppression of the pulse signal by the proposed device depends on the ratio of the nominal limiting resistor and the magnitude of the input resistance of the operational amplifier. Due to the fact that the degree of suppression of the impulse component of the amplified signal arriving at the integrator does not depend on its polarity, it is possible to amplify different polarity pulses. The advantage is that the notch depth of the pulse part of the signal does not depend on its constant component due to the automatic sub- | 4 () f. 7

CTpoiiKH operadnimog-n amplifier gi. I reverse SPN1N.

In the linear pOMHMf operation of the device, the diodes 7 are under a zero potential, their resistance is high, and in nonlinear mode one of the diodes, depending on the polarity (output voltage, opens and short-circuits the non-inverting input of the operational amplifier with its inverting input which provides a high degree of suppression of the pulse component of the signal,

Claims (2)

1. A pulse amplifier with zero-level stabilization, containing an integrator, a limiting resistor, an input and output terminal, and a DC amplifier whose first input is connected to the input terminal and the output to the output terminal and the first output of a limiting resistor direct current is connected to the output of the integrator, characterized in that, in order to extend the functionality by providing the possibility of amplifying the bipolar signals, an additional resistor is inserted into it, the feedback operational amplifier non-inverting input of which is coupled to a second vshodom limiting resistor and the input of the integrator and is connected via a further inverting ABOUT common busbar and chcpf: feedback resistor with an output of an oggeracioin amplifier, and the nominal index, 1 registor must satisfy the ratios  about “p . Rorp where and v1x and V, k is the output voltage of the pulse amplifier; duration of amplified impulses; the maximum rate of rise of the output voltage of the operational amplifier and its gain; R, Ro6p resistance of resistors connecting the inverting input of the operational amplifier with the ground bus and with its output; Rerp is the resistance of the limiting resistor; Rj - input resistance operational amplifier. 2. The amplifier according to claim 1, characterized in that, in order to increase the degree of suppression of the amplified signal supplied to the integrator, between the inverting and non-inverting inputs of the operational amplifier, two oppositely connected diodes are connected.