Digital pulse signal width measurement circuit and measuring method

Abstract

The invention discloses a digital pulse signal width measurement circuit and method, and the measurement circuit comprises a sampling clock which is used for driving all registers in a circuit; an edge detection and interruption control unit, used for detecting a rising edge and a falling edge of a pulse signal on the input pin Input so as to control signal acquisition; an integer encoding unit, comprising a counter and a register and used for measuring an integer part mu of the width of a high level or a low level on the input pin Input by taking 1 / f of one period of the sampling clock as a reference unit; a signal capture chain, used for sampling an output level value of each delay unit DLL; a decimal encoding unit, used for finding out and recording the propagation position of the pulseedge on the signal capture chain; and a calibration control unit, used for calibration. The measurement method is realized based on the measuring circuit. The method has the advantages of high precision, simple structure, low resource cost and the like.

Description

technical field [0001] The invention mainly relates to the technical field of high-precision digital pulse signal measurement, in particular to a digital pulse signal width measurement circuit and a measurement method. Background technique [0002] In a large number of industrial and consumer equipment and instruments, it is generally necessary to measure voltage, current, capacitance, speed, distance and other signals, and the measurement accuracy directly affects the accuracy of equipment and instruments. [0003] High-precision digital pulse signal width measurement is widely used in pulse sequence period / duty cycle measurement, instantaneous speed measurement, voltage measurement across isolation boundaries, distance / sonar measurement and scanning, capacitive touch sensing and other applications. [0004] In digital signal processing devices, the signal measurement is generally to quantify the voltage, capacitance, speed, distance and other signals into digital pulse ...

AI Technical Summary

Problems solved by technology

However, this method limits the operating range of the sampling clock. At the same time, it requires a separate capture delay chain and periodically executes the software calibration procedure, which increases the hardware and software overhead.

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