Measuring method and circuit for pulse time interval based on integrated phase detection discriminator

Abstract

The invention belongs to the technical field of electronic measurement, and particularly relates to a measuring method and circuit for a pulse time interval based on an integrated phase detection discriminator.According to the measuring method and circuit, two input pulses are subjected to amplitude limiting through an amplitude limiter, a phase difference pulse is obtained through the phase ratio of the high-frequency integrated phase detection discriminator, and after active proportional-integral filtering and A / D conversion are carried out, the phase difference between the two input pulses is calculated through an MCU; one of the two input pulses is subjected to frequency division to be input into one port of the MCU, and the period of the pulse is measured through the MCU; according to the measured phase difference and the measured pulse period, the time interval between the two pulses is calculated through the MCU, and the result is sent to be displayed.The high-speed phase detection technology, the bipolar analog-digital conversion technology and the high-speed frequency division technology are synthetically used, and under the control of the MCU, the time interval between the two same-frequency pulse signals within the wide frequency range is accurately measured.

Description

technical field [0001] The invention relates to pulse time interval measurement technology in the technical field of electronic measurement, in particular to a pulse time interval measurement method and circuit based on an integrated phase and frequency detector. Background technique [0002] Pulse time interval measurement technology is of great significance to the national economy and national defense construction, and has a wide range of applications in modern communications, positioning timing, aerospace measurement and control, digital oscilloscopes and other fields. Time interval measurement technology has a long history, and can be roughly divided into two categories: analog method and digital method, mainly including time-amplitude conversion method, time interval extension method, vernier method, tapped delay line method, etc. The traditional analog method is inseparable from the analog-to-digital conversion process, which is easily affected by external interference...

AI Technical Summary

Problems solved by technology

The traditional analog method is inseparable from the analog-to-digital conversion process, which is easily affected by external interference, and the measurement accuracy cannot be very high; while the digital method does not require analog-to-digital conversion and has high measurement accuracy, but requires a large-scale integrated circuit (ASIC) Circuit) support, complex process, high production cost

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