SU847487A1 - Amplification regulating device - Google Patents

Description

one

The invention relates to general-purpose electronic devices, namely, devices for adjusting the gain.

A device for adjusting the gain is known, which contains an input control signal bus connected via a control unit to the output busbar of a thermistor heating current. . This device allows for relatively high gain control accuracy to.

However, it has a complex structure.

It is also known a device for adjusting the gain, comprising an input control signal bus j connected to the input of the blocking element and to the first input of a differential amplifier, the second input of which is connected to the first of the input buses of the reference voltage, and the output connected through a switch connected to the output of the blocking element, and a capacitive memory element, having a control input, with an input of a power amplifier, the output of which is connected to the output bus of the heating current of the thermistor. This device has a relatively simple construction G2.

The disadvantage of this device lies in the significant error of the gain control result.

The purpose of the invention is to reduce the error of the result of the gain control.

Claims (1)

The goal is achieved by the fact that a voltage converter connected in series into a well, a pulse generator, a pulse generator, a first additional switch, an integrating circuit, a second secondary switch, a driver of corrective pulses, a third switch and a diode, connected between the output of the power amplifier and the control input of the capacitive memory element. At the same time, the inputs of the first and second additional switches are connected to the voltage converter in the pulse duty cycle, and the input of the third additional switch to the output of the blocking element connected to the second input voltage bar of the reference voltage. The figure shows the proposed device for gain control, an option. The proposed device contains an input bus 1 of a control signal connected to the input of block 2 and to the first input of differential amplifier 3, the second input to which is connected to the first input bus 4 of the reference voltage. The output of the differential amplifier 3 is connected via a switch 5 connected to the output of blocking element 2 and a capacitive memory element 6 having a control input to the input of power amplifier 7, the output of which is connected to the output bus 8 of the heating current of the thermistor that provides the gain control. The device also includes a transducer 9 connected in series, for example, a pulse duration, a pulse generator 10, a first additional switch 11, an integrating circuit 12, a second additional switch 13, a driver of 14 correction pulses, a third additional switch 15 and a diode 16 connected between the output of power amplifier 7 and a control input of the capacitive memory element 6. At the same time, the inputs of the first and second optionals 1x keys 11 and 13 are connected to the voltage converter 9 to the pulse duty cycle, and the output of the third additional key 16 to the output of the blocking element 2 connected to the second input bus 17 of the reference voltage. The voltage converter 9 to the pulse duty cycle forms a sequence of pulses, the duty cycle of which characterizes the heating current of the thermistor. The pulse generator 10 generates a burst of pulses in the intervals between the pulses of the voltage converter 9 to the pulse duty cycle. The integrating circuit 12 forms a sawtooth voltage, which, through the second additional key 13, acts on the shaper 14 of corrective pulses. Corrective pulses of the latter through the third additional key 15 and diode 16 affect the capacitive element 6 of the memory, reducing the level memory error. The use of the invention significantly reduces the gain control error. The invention can find application in transmission systems with frequency division channels. An apparatus for adjusting a gain, comprising a pilot signal input bus connected to the input of a blocking element and to a first input of a differential amplifier, the second input of which is connected to the first of the input buses of the reference voltage, and the output connected through a switch connected to the output of the blocking element and a capacitive memory element, having a control input, with an input of a power amplifier, the output of which is connected to the output bus of the heating current of the thermistor, characterized in that, in order to reduce the error of the result of the gain control, a voltage transformer coherently sequenced into a pulse duty cycle, a pulse generator, a first additional switch, an integrating circuit, a second additional switch, a corrector driver, a third additional switch, and a diode switched on by the output of the power amplifier and control the input of the capacitive memory element, the inputs of the first and second additional switches are connected to a voltage to pulse-duty cycle converter and the input of the third additional key to the output of the blocking element connected to the second bus of the reference voltage. Sources of information taken into account during the examination 1. Japan Patent No. 53-25628, cl. 98 5 All, 1978. lHKatfeemoinn ipeI K.3chwoir2bc "oer.Ein Ueitun (JSre (yger mit tCondenadtor-MOSPET-Speidhe - zur PeqreeVia & tUTiqp i BreHband-TF-S 9tem o (u-Hoa3Lia itab € o : ftotndl 28, g74, Jfг4, d .- ((PROTOTIP). 1 if