SU1492449A1 - Phase comparator - Google Patents

Abstract

The invention relates to a pulse technique and can be used in measuring devices. The purpose of the invention is to increase efficiency by reducing power consumption, as well as expanding the functionality by providing an indication of the coincidence of the fronts of the input pulses. A differentiating circuit 6, resistors 9, 10, 11, a diode 12 are inserted into a device containing a differentiating circuit 5, valves 7, 8, and the valves 7, 8 are made in the form of transistors. A short pulse generated by the differentiating circuit 5 (6) along the front of the input pulse passes through the valve 7 (8) only if the pulse has not yet started on the other input bus. With the coincidence of the pulse fronts, a short pulse is formed on the output bus 13. 1 Cp f-crystals, 1 slug.

Description

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The invention relates to a pulse technique and can be used in measuring devices.

The purpose of the invention is to ensure the economics of the device by reducing the power consumption, as well as expanding the functional capabilities of the device by enabling the indication of the coincidence of the fronts of the input pulses.

The drawing shows a comparator diagram,

The device contains the first I and second 2 input buses, the first 3 and second 4 output buses, the first 5 and second 6 differentiating circuits, the first 7 and second 8 valves, the first 9, second 10 and third 11 resistors, diode 12 and the third output power 13 .

The first 1 and second 2 input buses through the first 5 and second 6 differential circuits are connected to the inputs of the first 7 and second 8 valves, respectively, and through the second 10 and first 9 resistors - to the control inputs of the second 8 and first 7 valves, respectively. The outputs of which are connected to the second 4 and first 3 output buses, respectively. The first terminal of the third resistor 11 and the cathode of diode 12 are connected to the outputs of the first 5 and second 6 differentiating circuits, respectively. The second terminal of the third resistor 11 and the anode of the diode 12 are combined and connected to the third output bus 13.

The first 7 and second 8 valves are in the form of transistors, and the emitter, base and collector transistor are the input that controls the input and output of the valve, respectively,

The device works as follows.

The input busbars I and 2 receive pulse sequences of the same frequency, having the form of a square wave. At the outputs of differentiating circuits 5 and 6 short positive circuits 5 are formed to pass through the first valve 7 to the output bus 3. The current will flow from the emitter of the transistor valve 7 its collector and through the load connected to the output bus 3. The fan transistor will remain locked because at its base there is a positive level from the input bus 1. The pulse from the output of the differentiating circuit 6 will not pass to the output bus four.

In the opposite case, a short pulse will pass to the output bus 4, and there will not be a pulse on the output bus 3.

When the fronts of the input pulses coincide, the valves 7 and 8 will remain locked, but the pulse from the output of the first differentiating circuit 5 will pass through the third resistor 11 to the third output bus 13, since the diode 12 is locked at this.

Thus, the proposed device provides an indication of the sign of phase difference and phase equality, the device does not need a power source and consumes energy only from sources of input pulses.

Claims (2)

1. A phase comparator comprising first and second valves, the outputs of which are connected to the first and second output buses, the first differentiating circuit, the output of which is connected to the input of the first valve, the first and second input buses, characterized in that , the first and second resistors and the second differentiating circuit are entered into it, the output of which is connected to the input of the second valve, the inputs of the first and second differentiating circuits are connected to the first and second input buses and through the second and first resistors to the control inputs rows of the second and first valves body pulses coinciding with the front-Q, respectively, each one with the input pulse pulses. Suppose that the pulses on the first input bus 1 are ahead in phase of the pulses on the second input bus 2, i.e. on the input bus 2, the pulse front appears when the positive level is already present on the input bus 1. In this case, a positive impulse c, the output of the first differential The style is in the form of a transistor, the emitter, the base and: the collector of which are, respectively, the input controlling the input and output of the valve. 2. A comparator in accordance with claim 1, which is based on the fact that, in order to extend the functionality by providing the possibility of indicating the coincidence of the fronts, the input 514924496 pulses, the third re- first n second differentiating eistor and diode are entered into it, the first output of the circuits, and the second output of the third resistor and cathode of the resistor and the diode anode are connected to the outputs of the third output bus.