Full-digital debouncing circuit and method

Abstract

The invention discloses a full-digital debouncing circuit and a full-digital debouncing method. The debouncing circuit comprises an edge detection circuit, a digital clipping circuit and a sampling circuit. The edge detection circuit is composed of two D triggers and an XNOR gate and is used for detecting a rising edge and a falling edge of an input square signal with jitter; the digital chipping circuit is composed of counter with an asynchronous reset end and the D trigger and is used for chipping the signal; the sampling circuit is composed of two D triggers and is used for sampling the signal so as to output clean square signal finally. Compared with the debouncing method such as current digital chipping, the debouncing method presented by the invention can be used for reducing delay of introducing the digital chipping while effectively debouncing to ensure duty ratio of the square signal. The full-digital debouncing circuit and the full-digital debouncing method of the invention are particularly applied to the application field that moving phase triggering control has relative strict phase requirement.

Description

technical field [0001] The invention relates to an integrated circuit technology, in particular to an all-digital debounce circuit capable of obtaining low-delay and reliable square waves. Background technique [0002] In any circuit design, the correctness of the signal is very important. When there is jitter in the signal, it often causes false triggering of the circuit, which leads to the operation error of the entire circuit system. Square wave signals are widely used in the field of integrated circuits. Due to noise and interference in the actual environment, there is jitter near the rising and falling edges of square wave signals entering the circuit, such as button signals, comparator outputs, etc., such as figure 1 The input signal shown is noisy. After passing through the zero-crossing comparator, there are relatively dense pulse jitters near the rising and falling edges of the output square wave. These pulse signals will cause the malfunction of the next-stage circ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the duty cycle of the processed square wave signal changes relative to the original signal and there is a phase delay in the existing de-jittering method,

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