Pulse filtering circuit and method thereof

Abstract

The present invention relates to a pulse filtering circuit and a method thereof, wherein the pulse filtering circuit comprises: a receiving circuit (001) for receiving a pulse signal; a filtering circuit (002) for detecting the width of the pulse signal; and an output and feedback circuit (003) for outputting a feedback control signal to the filtering circuit (002) according to the width of the pulse signal, and adjusting the outputted pulse signal into a same-phase pulse signal, and outputting; and the filtering circuit (002) sets the width of the pulse signal according to the feedback control signal. The present invention can transport the pulse signal having the width that is greater than the set width without distortion, and avoid the distortion of the narrow pulse in a traditional circuit, so the present invention 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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