Method for detecting phase difference between two channels of square wave input signals by using D trigger

Abstract

The invention discloses a method for detecting phase difference between two channels of square wave input signals by using a D trigger; the method adopts the clock signal input ports of two D triggersas the input ends of the two channels of detected signals, and can realize the detection of 0-360 degrees on the phase difference between the two channels of signals, namely IN1 and IN2; and the circuit has simple and reliable organization and strong interference resistance. As the general D trigger has extremely short response time, the detection accuracy can reach nanosecond degree. Besides, the invention adopts a very common device, avoids working at high clock frequency, has easy realization and wide application range, and can be effectively applied to industrial places.

Description

Technical field: [0001] The invention relates to a method for detecting the phase difference of two square wave input signals by using a D flip-flop, which belongs to the application field of electronic technology. Background technique: [0002] With the development of electronic technology, phase detectors are more and more widely used in electronic technology, but the structure of existing phase detectors is relatively complicated. Accuracy requires a clock frequency of up to 100MHz. At this time, the requirements for device requirements and circuit integrated wiring anti-interference are extremely high, and implementation is extremely difficult. As we all know, the D flip-flop is the most convenient to use when the input signal is single-ended. Its state equation is Qn+1=Dn, and its output state is updated on the rising edge of the CP pulse, so it is also called rising edge trigger. Edge trigger, the state of the flip-flop only depends on the state of the D terminal befo...

AI Technical Summary

Problems solved by technology

[0002] With the development of electronic technology, phase detectors are more and more widely used in electronic technology, but the structure of existing phase detectors is relatively complicated. Accuracy requires a clock frequency of up to 100MHz. At this time, the requirements for device requirements and circuit integrated wiring anti-interference are extremely high, and the implementation is extremely difficult.

As we all know, the D flip-flop is the most convenient to use when the input signal is single-ended. Its state equation is Qn+1=Dn, and its output state is updated on the rising edge of the CP pulse, so it is also called rising edge trigger. Edge trigger, the state of the flip-flop only depends on the state of the D terminal before the arrival of the clock, the D flip-flop is widely used, and can be used as digital signal registration, displacement registration, frequency division and waveform generation, etc., but it has not been found to be used in On square wave signal phase discrimination

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