A high-precision pulse time interval measurement method and circuit
A pulse time and interval measurement technology, applied in the direction of electrical unknown time interval measurement, time interval measurement devices, clocks and watches, etc., can solve the problems of complex process, high production cost, and susceptibility to external interference, etc., and achieve high measurable signal frequency , simple circuit and high measurement accuracy
Active Publication Date: 2020-07-14
SHANDONG JIAOTONG UNIV
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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 the measurement accuracy is high, but it needs the LSI ASIC support, complicated process and high production cost
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[0020] In conjunction with the accompanying drawings, the high-precision pulse time interval measuring method of the present invention is carried out according to the following steps:
[0021] a. Select a PECL integrated phase and frequency detector MC12040, and its two pulse input terminals are R and V respectively.
[0022] b. Introduce one of the two input pulse signals to be tested from the input 1 terminal, and input it to the input terminal R of the phase and frequency detector MC12040 after passing through the first coupling and limiting circuit. The other one of the input pulses to be tested is introduced from the input 2 terminal, and after passing through the second coupling and limiting circuit, it is input to the input terminal V of the MC12040.
[0023] c. The output terminal U of PECL integrated phase and frequency detector MC12040 is connected to the non-inverting input terminal of the first level conversion circuit TLV3501, the inverting input terminal of TLV35...
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The invention belongs to the technical field of electronic measurement, and particularly relates to a high-accuracy pulse time interval measurement method and circuit. The high-accuracy pulse time interval measurement method comprises the steps of performing amplitude limitation on two paths of pulse signals by an amplitude limitation circuit, performing phase comparison to obtain phase differencepulse by a high-frequency integrated phase detection discriminator, judging, calculating and correcting an error by a DSP after level conversion to obtain a time interval value between the two pathsof pulse signals, and sending the time interval value for displaying. Accurate measurement of a time interval parameter between two paths of same-frequency input pulse signals within a relatively widefrequency range is achieved by comprehensively employing a high-speed phase detection technology and rapid operation and processing of the DSP.
Description
technical field [0001] The invention relates to pulse time interval measurement technology in the technical field of electronic measurement, in particular to a high-precision pulse time interval measurement method and circuit. Background technique [0002] Pulse time interval measurement technology 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 expansion method, vernier method and so on. 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 the measurement ac...
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IPC IPC(8): G04F10/04
CPCG04F10/04
Inventor 司朝良张广渊饶中洋
Owner SHANDONG JIAOTONG UNIV