Method and device for measuring time interval through delay line in cascaded two stages

Abstract

A method for measuring time interval with two stage cascade delay line includes measuring numbers of clock leading edge in time interval to be measured i e cycle number of clock, measuring two time intervals not being complete cycle of front and back time intervals to be measured, sending those less than resolution of first stage relay line to the second stage for further subdivision, calculating out value of time interval to be measured by utilizing measured results. The measuring device is composed of only delay unit and D trigger for both delay lines.

Description

technical field [0001] The invention relates to high-precision time interval measurement technology, and belongs to the field of optical disc read signal analysis and detection Background technique [0002] The most common method of measuring time intervals is the pulse counting method, the principle of which is as follows figure 1 shown. The high / low level (that is, the time interval) of the signal to be tested controls the switch of the high-frequency counter, and the time width to be tested can be obtained by calculating the number of pulses during the period. Assuming that the number of pulses measured is n, the counting clock cycle T 0 , then the actual measurement result T w 'is an integer multiple nT of the counting clock period 0 . The measurement process of this method is relatively simple, but the measurement accuracy and resolution are not easy to improve. Since the position of the rising edge or falling edge of the signal to be measured relative to the coun...

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Problems solved by technology

But this method is based on digital CMOS technology and ASIC chip design, the cost of one design is very high, especially when

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