SU1554109A1 - Controllable phase shifter - Google Patents

Abstract

The invention relates to radio engineering and can be used in devices of rectangular voltage, the phase of which is regulated relative to the original signal by changing the control voltage. The purpose of the invention is to increase the reliability of the phase shifter. The controlled phase shifter contains a summing amplifier, integrator, inverter, first and second comparators, the second inputs of which are connected to the control input of the phase shifter, the output of the first comparator is connected via the first differentiator to the S-input of the RS flip-flop, and the output of the second comparator is connected to the second differentiator The R input of the RS flip-flop, the output of the RS flip-flop is the output of the controlled phase shifter, the first capacitor and the second capacitor, the first terminals of which are connected to the input of the controlled phase shifter, the second output of the first The capacitor is connected to the first input of the summing amplifier, the second output of the second capacitor is connected via an integrator to the second input of the summing amplifier, the output of which is connected to the first input of the first comparator and through an inverter connected to the first input of the second comparator. 2 Il.

Description

The invention relates to radio engineering and can be used in voltage-forming devices — rectangular in shape, the phase of which is regulated relative to the original signal by changing the control voltage.

The purpose of the invention. - increase in reliability of the phase shifter by higher-. neither the stability of operation at the limiting values of the range of the phase control.

FIG. 1 shows a functional diagram of the phase shifter; Fig. 2 are diagrams explaining the operation of the device.

The controlled phase shifter contains a summing amplifier 1, integrator 2, inverter 3, first 4 and second 5 comparators, the second inputs of which are connected to the control input of the phase shifter, the first differentiator 6, the RS flip-flop 7, the output of which is connected to the output of the controlled phase shifter, the second the differentiator 8, the second capacitor 9 and the first capacitor 10, the first terminals of which are connected to the input of the controlled capacitor.

Managed phase shifter works as follows

A rectangular-shaped voltage signal is supplied to the yoke input;

cl

SP

four

WITH

two (Fig. 2c). This signal goes through the second capacitor 9 to the input of the integrator 2 and through the first capacitor 10 to the first input of the summing amplifier 1. At the output of the integrator 2, a bipolar sawtooth voltage is formed (Fig. 2c), which is fed to the second input of summing amplifier 1.

The first capacitor 10 and the input impedance of summing amplifier 1 form a differentiating circuit. The voltage form at the first input of summing amplifier 1 is shown in FIG. 2d.i At the output of summing amplifier 1, a sawtooth voltage is generated, the shape of which is shown in FIG. 2e, which has short peaks at inflection points corresponding to phase shifts of 0 and 180 °, whose leading edge exactly corresponds to these points.

Next, the signal from the output of summing amplifier 1 is fed to the first input of the first comparator 4, and also through the inverter 3 to the first input of the second comparator 5 (FIG. 2f). At comparators 4 and 5, the sawtooth voltage is compared with the level of the control signal may have any polarity.

The waveforms of the output of comparator 4 and 5 and their temporary position are shown in FIG. 2g and k, respectively.

The output signals of the comparators are differentiated by differentiators 6 and 8 (Fig. 2m and n) and are fed to respectively

0

five

the current inputs of the RS flip-flop 7. The output signal of the latter is shown in FIG. 21. When the control signal is changed from minimum to maximum, a phase control range of 0 ° tfil80 ° is provided.

Claims (1)

Invention Formula A controlled phase shifter containing an integrator, an inverter, the first and second comparators, the second inputs of which are connected to the control input of the phase shifter, the outputs of the first and second comparators are connected via the first and second differentiators respectively to the S and R input RS-flip-flop, the output of which is connected to the output of a controlled phase shifter, an amplifier, the output of which is connected to the first input of the first comparator, characterized in that, in order to increase reliability by increasing the stability of operation at limit values The first and second capacitors are introduced, the first terminals of which are connected to the input of the controlled phase shifter, the second output of the first capacitor is connected to the first input of the summing amplifier. , and the second output of the second capacitor through the integrator is connected to the second input of the summing amplifier. 1 V f FIG. 2