SU720690A1 - Multichannel amplifier device with automatic gain stabilization - Google Patents

Description

one

The invention relates to electronics.

A multichannel amplifying device with automatic stabilization of the amplification factor is known, which contains a reference amplifier and N adjustable amplification channels, each of which includes an adjustable amplifier and a multiplier Щ.

However, the well-known multi-channel amplifying device with automatic stabilization of the gain does not have the necessary stability of the gain and the simplicity of the design.

The purpose of the invention is to increase the stability of the gain and simplify the device.

To achieve this goal, a multichannel amplifying device with automatic stabilization of the amplification factor, containing the reference amplification power "1" and N retractable gain channels, each of which includes

adjustable amplifier and multiplier, a common pulse generator for the entire device is introduced, and in each of the regulated gain channels - a switch and averaging filter, the output of the clock generator is connected to the control inputs of the switches, and the output of the averaging filter is connected to each channel the control input of the adjustable amplifier, the signal inputs of the switch are respectively connected to the direct and inverse of the multiplier, to the input and output of the adjustable amplifier, to the input And the output the reference amplifier, and the switch outputs, respectively, are connected to the input of the averaging filter and to the first and second inputs of the multiplier.

The drawing shows a structural electrical circuit of the proposed device.

A multichannel amplifying device with an automatic stabilization of the gain factor contains a reference amplifier 1, S of adjustable gain channels, each of which contains an adjustable amplifier 2.1, 2.2, ... 2 N, transn6, 1Ttel 3.1, 3.2, .., ZN switch 4.1, 4.2, .. 4N, averaging filter 5.1, 5.2, ... 5N, generator of 6 clock pulses. A multichannel amplifying device with automatic stabilization of the gain operates as follows. The signal and., Is fed to the input of this amplifier of the amplifier 1, the output of which is the signal Ugm where is the gain of the reference amplifier. Simultaneously with the signal to the inputs of adjustable amplifiers 2.1.4. 2. Q1 receives signals and). , on the output of which signals Ue,. K., U. where i is the index number of the adjustable amplifier (i 1 2, 3 ... N). In addition, c. each channel signals u, b. , ... And and ,, „. The following inputs of switches 4.1 ... 4.N come to .coTBetcT. The switches 4.1 ... 4.1, controlled by the generator of 6 clock pulses, having implemented the principle of time separation of signals, alternately feed the first inputs of the respective multipliers 3.1 ... 3.N signals Ugj. and .i and on the second inputs signals Ug ,. and Mvykh- on the direct and inverse outputs of the multipliers 3.1 ... 3. And the signals U are alternately formed. . Ubmx. which at the terminals of the commutators 4 ..... 4.N are fed to the inputs of the corresponding averaging filters 5.1 ... 5.N, at the outputs of which control signals are generated and, IR, i, b.- ex. J bmh.d) l where t is the time constant of the averaging IX) filter. These signals are sent to the control input of the corresponding adjustable amplifier 2.1 ... 2.N and 6 process; they equalize the gain factor of the gain Kj of the adjustable amplifiers relative to the Ra of the reference amplifier 1 If the condition is met in each channel; ()

Claims (1)

720690 or (1), then the magnitude of the control voltage of the LCU corresponding to the channel must be equal to zero. If the condition (1) is not fulfilled, any of the gain channels at the output of the averaging filter 5.1 ... 5.N of the corresponding channel results in a control voltage di. Proportional to the change in the gain of the corresponding adjustable amplifier 2.1 ... 2 N relative to the reference the amplifier 1 and under its influence the gain of the given channel changes until equality (1) is fulfilled. In this case l. The feasibility of a multichannel amplifying device with automatic stabilization of the gain is to increase the stable gain and simplify the device. Claims of the Invention A multichannel amplifying device with automatic stabilization of the gain, containing a reference amplifier and N adjustable gain channels, each of which includes an adjustable amplifier and multiplier, e e III so that, in order to increase the coefficient stability amplification and maturation of the device, a clock pulse generator common to the entire device is introduced into it, and in each of the N adjustable gain channels, a switch and averaging filter, the generator output t Actual pulses are connected to the control inputs of the switches, and in each channel the output of the averaging filter is connected to the control input of the adjustable amplifier, the signal inputs of the switch are respectively connected to the forward and inverse outputs of the multiplier, to the input and output of the adjustable amplifier, to the input and the output of the reference amplifier, and the switch outputs, respectively, are connected to the input of the averaging filter and to the first and second inputs of the multiplier. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 543141, cl. H 03 Q 3 / 2O, 31.07.75 (prototype).  Ti I h : t TU - ".