High-accuracy phase frequency detector

Abstract

The invention discloses a high-accuracy phase frequency detector, which comprises a basic phase frequency detection unit and a rapid locking unit, wherein the basic phase frequency detection unit can be used for realizing detection of two input waveform frequencies and phases; and the rapid locking unit can be used for increasing the accuracy of the phase frequency detector. When two input waveform frequencies and phases of the phase frequency detector are consistent, the rapid locking unit does not work, and two paths of outputs of the phase frequency detector are at low levels; when two input waveform frequencies or phases of the phase frequency detector are inconsistent, the rising edge of one input waveform comes to turn corresponding output to a high level immediately, and the other output is kept at a low level; and when the rising edge of the other input waveform comes, the rapid locking unit starts working, and two outputs turn to low levels once again. The high-accuracy phase frequency detector is compact in structure, and has small phase frequency detection errors and low resource consumption.

Description

technical field [0001] The invention relates to a high-precision frequency and phase detector, which compares waveforms of different frequencies and phases, and is applied in the field of frequency and phase detection and synchronization. Background technique [0002] In the field of signal synchronization and signal frequency and phase detection, the frequency and phase detector plays a very important role. It compares the frequency and phase of two input waveforms and outputs the comparison result, which can be used to control the circuit to achieve signal synchronization and detection. At present, commonly used frequency and phase detector circuits include XOR gate phase detectors, edge phase detectors, and frequency and phase detectors. The XOR gate frequency phase detector circuit is relatively simple, but its performance is relatively poor and the capture time is long; the edge phase detector compares the signal edges, and the commonly used ones are Hogge phase detecto...

AI Technical Summary

Problems solved by technology

[0003] There is an output delay in the existing frequency and phase detection circuit. When both input signals are high level, the reset signal passes through a delay of an AND gate. and a trigger delay It only works, and the two waveforms in the output result are increased by one The high level of the width affects the synchronization and detection effect, especially when the signal frequency is relatively high, The level effect of the width is more obvious

Images