Clock Delay Control Method Based on Printed Circuit Board

Abstract

The invention provides a clock delay control method based on a printed circuit board. The method includes the steps: firstly, setting up a shunt circuit in the printed circuit board design; secondly, extracting a topological structure of the shunt circuit; thirdly, setting a laminated structure in the printed circuit board design; fourthly, adding pulse excitation at a source end and extracting waveforms; fifthly, adding periodic excitation at the source end and extracting waveforms; sixthly, acquiring constant delay waveforms. The clock delay control method based on the printed circuit board is used for realizing high-precision data sampling by a clock, and belongs to innovation on high-precision data acquisition systems. Multichannel signals are subjected to board delay control by means of a characteristic of constant delay of signals transmitted in media, the delay control precision can reach a ps level, and data sampling precision by the clock is improved by controlling delay of a group of clock signals.

Description

technical field [0001] The invention belongs to the field of data sampling, and in particular relates to a clock delay control method based on a printed circuit board. Background technique [0002] With the construction of the smart grid, the collection of high-frequency signals in power communication is gradually increasing. Due to the limitations of existing components, it is difficult for low-speed analog-to-digital converters to collect high-frequency signals in real time. The equivalent sampling technology utilizes the periodicity of the signal, reduces the sampling rate at the cost of increasing the acquisition time, and restores the original signal by reorganizing the multi-sampled data, which can realize high-speed data acquisition in the substation. The clock delay control method based on the printed circuit board belongs to the category of sequential equivalent sampling. This method can greatly simplify the hardware system structure of the substation, reduce the pr...

AI Technical Summary

Problems solved by technology

This kind of method has the problems of high cost and complicated peripheral circuits. In the actual use process, there is an urgent need for a flexible, economical and high-performance clock delay control method to achieve high-precision data acquisition.

[0004] The biggest problem of the existing delay control method based on printed circuit boards is that when the signal is transmitted on the multi-channel shunt circuit, the overshoot of the waveform is caused by the continuous reflection formed by the impedance mismatch between the transmitting end and the receiving end of the transmission line. And ringing and other phenomena, when there are multiple reflections with a long duration, serious timing conflicts and waveform distortion may occur. At this time, it is necessary to add matching resistors at the source and receiver to reduce this emission

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