Circuit for extracting duty cycle information of digital pulse signal

Abstract

The invention provides a circuit for extracting duty cycle information of a digital pulse signal, mainly solving the problems of unstable working and low calculation accuracy in existing method for extracting duty cycle information of the digital pulse signal. The method for extracting duty cycle information of the digital pulse signal is applied to pulse signals that have the frequency range of 1-1000Hz, voltage of TTL level and duty cycle of 50%-99%. Firstly, an input signal is converted into two paths of direct current signals through two paths of integral circuits with opposite input phases; clutter is filtered through a lowpass filtering circuit; and finally, the direct current signal with high value is selected from the two paths of direct current signals and is sent out. According to the circuit for extracting duty cycle information of the digital pulse signal, it is ensured that the output value of the duty cycle of waveform corresponding level is always greater than 50%, so that real-time, reliable and stable direct current output is provided for a rear end voltage acquisition circuit.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a circuit for determining the duty cycle information of a digital pulse signal. Background technique [0002] Duty cycle is a basic parameter of digital pulse signal, no matter in the design of pulse power supply or in the application of pulse signal, it is necessary to know the duty cycle of pulse signal. Different application situations have different requirements on the duty cycle of digital pulse signal, so it is very necessary to measure the real-time and reliability of the duty cycle of pulse signal. [0003] At present, there are three main schemes for measuring duty cycle: oscilloscope comparison method, single-chip computer calculation method, and average value conversion method. Among them, the oscilloscope comparison method is simple and easy to realize, but the real-time performance is not strong; the single-chip computer calculation method has high real-time perform...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of poor real-time performance, long development cycle and low accuracy in the above three measurement schemes, and propose a new circuit for measuring the duty ratio of digital pulse signals

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