基于施密特触发器的相对时延校准电路

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英文篇名：A Relative Delay Calibrate Circuit Based on Schmidt Trigger 作者：蔡春贵 ; 王登峰 ; 钟兴旺 ; 胡经民 ; 王玉凡 英文作者：CAI Chungui;WANG Dengfeng;ZHONG Xingwang;HU Jingmin;WANG Yufan;China Academy of Space Technology (Xi'an);Capital Aerospace Machinery Corporation; 关键词：施密特触发器 ; 相对时延 ; 校准 英文关键词：High-speed ADC;;High-speed signal acquisition;;ADC analog front-end;;Coded clock source 中文刊名：KJDZ 英文刊名：Space Electronic Technology 机构：中国空间技术研究院西安分院;首都航天机械公司; 出版日期：2019-06-25 出版单位：空间电子技术 年：2019 期：v.16;No.183 语种：中文; 页：KJDZ201903012 页数：4 CN：03 ISSN：61-1420/TN 分类号：75-78

摘要

为了同步导航设备播发的多路秒脉冲,需对多路秒脉冲进行相对时延校准。文章将秒脉冲由方波转换为梯形波,输入至施密特触发器,通过控制施密特触发器的判决阈值电压,便可改变秒脉冲的相对时延。使用方波信号控制差分恒流源器件对电容进行充电,电容两端的压差为方波转换的梯形波。利用减法电路将压差提取出来并进行放大;利用加法电路为压差信号增加直流偏置,直流偏置等于施密特触发器的供电电压的1/2。将秒脉冲信号输入到该电路,可以通过改变电阻来控制方波信号的相对时延,从而降低各秒脉冲接收设备的相对同步误差,提高测量精度。通过电路设计和仿真验证两路信号30ns的相对时延校正,仿真结果显示误差优于50ps。
        For synchronization multiple second pulses broadcasted by navigation devices,the relative delay of multiple second pulses can be calibrated. The second pulse can be converted from square wave to trapezoid wave and input to the Schmidt trigger. By controlling the threshold voltage of the Schmidt trigger,the relative delay of the second pulses can be changed. The square wave signal is used to control the differential constant current source device to charge the capacitor,and the voltage difference at the two ends of the capacitor is trapezoidal wave converted by square wave. The voltage difference is extracted and amplified by subtraction circuit. The addition circuit adds DC bias to the differential voltage signal,and the DC bias is equal to the 1/2 of the power supply voltage of the Schmidt trigger. Inputting second pulses signal to the circuit can control the relative delay of the square wave signal by changing the resistor,thus reducing the relative synchronization error of each second pulse receiving device and improving the measurement precision. The relative delay calibration of two signal 30 ns is verified by circuit design and simulation. The simulation results show that the error is better than 50 ps.

引文

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