SU883786A1 - Device for signal non-synchronism determination - Google Patents

Description

The invention relates to a pulse technique and automation and can find application in instrumentation, in particular in oscillography for the automatic control of the operating modes of the synchronization channel. *

A device for measuring the phase shift, containing two shapers, the outputs of one of which are connected two coincidence units, a trigger, a pulse generator, an OR element, and two keys £ 1].

A disadvantage of the known device is limited, functionality.

The closest in technical essence to the invention is a device for monitoring time intervals containing a pulse shaper, a trigger, two generators of linearly varying voltage, outputs. which through integrators are connected to the inputs of a differential amplifier [2].

The disadvantage of this device is limited functionality, since it cannot be used to determine non-synchronous ™ signals.

* The purpose of the invention is the expansion of functionality.

To achieve this goal, a device for determining an unsynchronous type of signals containing a first pulse shaper, the output of which is • connected to the counting input of the first trigger. . first and second ramp generators, the outputs of which through integrators are connected respectively to the first and second · inputs of the differential amplifier, the second pulse shaper, commutator, are introduced. an output pulse shaper and a second trigger, the first and second inputs of which are connected to the outputs of the first and second pulse shapers, and the output - with the first input of the switch, the second input of which is connected to the output of the first trigger, and the outputs - with the inputs of the ramp generators, wherein the output of the differential amplifier is connected <to the input of the output pulse shaper.

In FIG. 1 shows a block diagram of a device; in FIG. 2- time diagrams explaining his work.

The device contains drivers 1 and 2 pulses, triggers 3 and 4, switch 5, generators 6 and 7 of a ramp voltage, integrators 8 and 9, differential amplifier 10, output driver 11 pulses.

The device operates as follows.

The signals, the synchronism of which should be determined, are fed to the inputs of the drivers 1 and 2. At the output of the drivers 1 and 2, short pulses are formed, the repetition period of which is proportional to the period of the signals under study (Fig. 2a, b). These pulses switch trigger 4. In this case, pulses are generated at the output of trigger 4, the duration of which is proportional to the phase shift between the signals studied at a certain point in time (Fig. 2, c). If the studied signals are synchronous, then the pulse duration at the output of trigger 4 is constant; ', and if they are not synchronous, then the pulse duration at the' output of trigger 4 is constantly changing in time.

Simultaneously with the operation of the trigger 4, the trigger 3 is started. The output voltage of the trigger 3 (Fig. 2, d) controls the switch 5, which alternately connects the output of the trigger 4 to one of the generators 6 and 7 of the ramp voltage (Fig. 2, d, c) . At the output of the generators 6 and 7, a linearly varying voltage is formed, the amplitude of which is proportional to the duration of the pulses received from their trigger 4 arriving at their input (Fig. 2, w). The pulse voltage from the generators 6 and 7 is converted to constant voltage using integrators 8 and 9, respectively (Fig. 2, and, k) and is fed to the inputs of the differential amplifier 10.

Since the linearly varying voltage generators 6 and 7 have the same parameters, when pulses of the same duration are received at their inputs (the studied signals are synchronous), pulses of the same amplitude will be formed at their outputs, and constant voltage of the same magnitude will be applied to the inputs of the differential amplifier 10. at the output of the differential amplifier 10, the voltage will not change.

If the studied signals are not synchronous, then, thanks to switch 5, the generators 6 and 7 will be started by pulses of different durations, pulses of varying amplitude will be generated at their output, and voltage of various sizes will be supplied to the inputs of differential amplifier 10 at certain times. At the same time, an alternating voltage will be generated at the output of the differential amplifier 10 (Fig. 2, l), which is fed to the input of the former 11 for further processing. The presence of an alternating voltage at the output of the differential amplifier 10 signals the non-synchronism of the monitored signals. This is the voltage after appropriate treatment. can be used to control automation devices. Due to the presence of switch 5, the device can be used in a wide frequency range (from one to several tens) of the signals under study.

In the general case, if the frequencies of the studied signals are not equal, trigger 3 can be connected to any driver, however, for more stable operation at higher frequencies, trigger 3 is advisable to trigger a signal whose frequency is lower.

Claims (2)

1. USSR author's certificate No. 480996, cl. G 01 R 25/00, 06/05/73. 2. USSR author's certificate 488336, cl. H 03 K 5/18, P.P.73. 2 “0 “B I five