SU621082A1 - Amplitude-pulse demodulator - Google Patents

Description

The invention relates to the hospitality industry and can be used in devices for converting pulse signals.

A device for demodulating signals with amplitude-impulse modulation (AIM), which contains a DIM signal source, is known. source of control pulses, storage capacitor and key circuit | l.

The disadvantage of such a device is an increase in output distortion at high switching currents and when operating in a wide range of temperatures.

Closest to the proposed invention, the amplitude-pulse demodulator contains a memory capacitor connected / via a four-diode bridge key diagonal to the output terminals of the LIM signal source, as well as a source of control pulses connected in series with the RC-4ieno key diagonal of the other bridge key, the latter connects the source of the pum signal to the storage capacitor only

for the duration of the existence of the control pulses jp.

A disadvantage of this device is the difficulty of balancing the bridge key circuit in a wide temperature range due to the strong temperature dependence of the volt characteristic of the drives. ,

The purpose of the invention is to reduce the nonlinear distortion of the output signal in a wide temperature range.

Claims (3)

This is achieved by the fact that a pulse demodulator containing a storage capacitor that connects through the first diode switch to the output terminals of the source pulse amplitude modulated signals, the source of control pulses and the source of the bias voltage, additionally introduces a second diode switch that is connected to the storage capacitor, the counter to the first diode key, the source of the amplitude-pulse-modulated signal and the source of control pulses are switched on by the output terminals in the circuit about DIODE and key sequentially consent but, as in the other chain - sequentially and opposite, and the source is connected to one terminal of the bias to the first and other key with a second diode. The drawing shows a circuit of one of the variants of the amplitude-pulse demodulator, in which the sources of the signal demodulator and control pulses are included in the diode switch circuits by means of pulse transformers. The pulse-amplitude demodulator contains a source of 1 PAM signals, a source of 2 control pulses, a source of 3 voltage offset, a storage capacitor 4, and a diode switch 5 to 6 connected between the storage capacitor 4 and the source 1 of the LIM signal. The source 1 of PAM signals and the source 2 of control pulses are connected with the help of pulse transformers 7 and 8 in series to the circuit of each diode switch, and they are connected in series and counter to the circuits of diode switch 5, and in series and in diode switch circuits 6. The device works as follows. In the initial state, the diode keys 5 and 6 are locked by the bias voltage from source 3. At the time of arrival of the PIM signal, control pulses are generated, which coincide in time with the PIM pulses and the duration of which is shorter than the pulse duration of the AIM pulses. At the moment of arrival of the control pulse in the circuit of each diode, the sum of three voltages is in effect: an AMF signal, a control pulse and a bias voltage. The last two voltages compensate each other, and under the action of the first, a diode switch 6 is opened and the storage capacitor 4 is charged to the amplitude of the pulse AIM. Upon receipt of the following control and AIM pulses of impulses, conditions are created for —charging or discharging capacitor 4. In this case, depending on the ratio between amplitude. The previous and subsequent PAM signals are 6,824, capacitor 4 will either be charged through diode switch 6, or discharged through diode switch 5. Thus, the installation of the second switch (diode) and the sequential switching on of the source of the PW signal and control source impulses into the circuit of each key is opposed and, accordingly, eliminates the connection between the control and output voltages, as well as between the input and output voltages in the absence of a control in a wide temperature range, which leads to a decrease in nonlinear distortions in output signal in a wide range of temperatures. Amplitude-pulse demodulator containing a memory capacitor, which is connected via a first diode switch to the output terminals of a pulse-amplitude-modulated signal source, a source of control pulses and a bias voltage source, in order to reduce non-linear distortion of the output signal in the wide temperature range, a second diode key is additionally introduced, which is connected to the storage capacitor opposite the first diode key, the source is amplt-like ulsno modulated signal and a source of control pulses included in the output terminals of the diode circuit and key sequentially according to, and in another chain - sequentially and opposite, and the source is connected to one terminal of the bias to the first and the other - with a second diode key. Sources of information taken into account in the examination:. 1. USSR author's certificate number 409363, cl. H 03 K 11 / GS, 1971. 2.Karamov 3. S. and Fomin A, F. Elements of analog radio telemetry systems. M.-L., Energie, 1966, p. 196197.