Filter circuit and filtering method

Abstract

The invention discloses a filter circuit and a filtering method, which can filter different types of glitches in a signal without influencing inherent characteristics of the signal. The filter circuit comprises an edge detection module, a reset bit module and an edge delay module. The edge detection module is used for receiving an input signal from the outside and outputting a first signal and a second signal according to the phase difference between the input signal and an output signal, and the output signal is obtained by processing the input signal through a filter circuit; the reset bit module is used for generating a third signal according to the first signal and the second signal; the edge delay module is used for generating a fourth signal according to the third signal and the input signal, and the fourth signal is obtained by delaying the input signal for a preset duration and is used for filtering the input signal.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a filter circuit and a filter method. Background technique [0002] An integrated circuit is a circuit with specific functions obtained by integrating electronic components such as resistors, capacitors, and transistors through semiconductor technology. [0003] Since electronic components are easily affected by the external environment during work, such as lightning and power grid fluctuations, signals generated by electronic components are prone to glitches. A glitch here can be thought of as a disturbance that affects the frequency and / or amplitude of a signal. Glitches will not only affect the normal operation of integrated circuits, but also cause damage to integrated circuits in severe cases. For this, glitches need to be filtered out. [0004] A current method for filtering glitches is to set a filter circuit on the path of signal interaction, such as a first-o...

AI Technical Summary

Problems solved by technology

However, the first-order passive RC filter circuit can only eliminate the positive or negative burrs of the signal, that is, it can only eliminate unilateral burrs, but cannot eliminate high-frequency burrs; the delay circuit can only eliminate nanosecond delays, which will affect the signal Intrinsic properties such as duty cycle

It can be seen that the current filter circuit is only effective for a certain type of burr, or the inherent characteristics of the signal may be changed during the filtering process

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