Anti-jitter circuit

Abstract

Provided is an anti-jitter circuit which comprises a switching pulse generating circuit, a forward anti-interference circuit, a backward anti-interference circuit, and a data selector. An output pulse controls the data selector in order to switch an output signal of either the forward anti-interference circuit or the backward anti-interference circuit as the output pulse. The anti-jitter circuit may automatically filter out a positive narrow pulse during a negative wide pulse and a negative narrow pulse during a positive wide pulse, especially may filter out key or switch contact jitter narrow pulse interference signal. The maximum widths of the positive narrow pulse and the negative narrow pulse required to be filtered out can be regulated by changing a charge time constant and a discharge time constant, respectively. The anti-jitter circuit can be used in the fields where a circuit is required to reliably remove key or switch pulse jitter influence.

Description

technical field [0001] The invention relates to a mechanical button or switch pulse signal processing circuit, in particular to an anti-vibration circuit. Background technique [0002] In digital signal circuits, it is often required to output pulses when mechanical buttons or switches are pressed. When the mechanical key switch is pressed or released, the switch pulse will generate a jitter interference pulse due to the jitter of the contact. Using software to eliminate switch jitter needs to consume CPU working time, which greatly wastes system resources. When it is necessary to use a circuit to eliminate the influence of the jitter pulse of the key switch, the commonly used methods are RS flip-flop and RC filter circuit. When the RS trigger is used, the key switch is required to have a normally closed switch and a normally open switch at the same time, and its application is limited. When the RC filter circuit is used, when the jitter interference is continuous narrow ...

AI Technical Summary

Problems solved by technology

When using the RS flip-flop, the key switch is required to have both a normally closed switch and a normally open switch, and its application is limited

When the RC filter circuit is used, when the jitter interference is continuous narrow pulse interference, the filter time constant needs to be increased to affect the rapid response capability of the circuit; or when there is continuous narrow pulse interference in the button circuit, the RC filter circuit has a DC memory effect. The previous narrow pulse will affect the filtering of the following narrow pulse

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