A pulse filter circuit and method thereof

Abstract

The present invention relates to a pulse filter circuit and a method thereof, wherein the pulse filter circuit comprises: a receiving circuit (001) for receiving a pulse signal; a filter circuit (002) for detecting the width of the pulse signal; output and feedback The circuit (003) is used to output a feedback control signal to the filter circuit (002) according to the width of the pulse signal, and adjust the output pulse signal to be in phase with the pulse signal and output it; the filter circuit (002) is set according to the feedback control signal Determine the width of the pulse signal. The invention can transmit any pulse signal larger than the set width without distortion, avoids the problem of narrow-wave pulse distortion in traditional circuits, and has important application value in the field of analog circuit design.

Description

technical field [0001] The invention relates to the field of analog circuit design, in particular to a pulse filter circuit and a method thereof. Background technique [0002] Input pulse signal filtering is an important function in the circuit system, which has a great influence on the performance and reliability of the system. [0003] figure 1 It is a schematic structural diagram of a simple pulse filter circuit in the prior art. Such as figure 1 As shown, the circuit is composed of a non-inverter, an RC filter circuit, and a Schmitt trigger, and the power supply of the circuit is VDD. This structure can filter out the noise below the fixed pulse width through the RC structure and the Schmitt trigger. The principle is that the input signal passes through the non-inverter to control the charging and discharging of the capacitor. When the input signal pulse width is narrow, the capacitor cannot be charged to When it is enough to make the Schmitt trigger flip, the output...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a pulse filter circuit and method for the above-mentioned shortcomings in the prior art, which can transmit any pulse signal larger than the set width without distortion, avoiding the problem of narrow pulse distortion in traditional circuits, Therefore, it is necessary to make the filtered time before reaching the positive increasing threshold of the Schmitt trigger during the capacitor charging process and the extra time before reaching the negative decreasing threshold during the capacitor discharging process exactly equal; it is also necessary to use any threshold value. Mitt trigger, avoiding the strict requirements on the Schmitt trigger threshold in traditional circuits

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