一种新的高精度电流/频率转换电路逻辑控制方法  

A new logic control method of the high precision current/frequency converter

作　　者：汪金华[1] 刘嘉 庄永河[1] 杨杨 李鸿高[1] WANG Jinhua;LIU Jia;ZHUANG Yonghe;YANG Yang;LI Honggao(The 43th Research Institute of China Electronics Technology Group Corporation,Hefei 230022,Anhui,China)

机构地区：[1]中国电子科技集团公司第四十三研究所,安徽合肥230088

出　　处：《微电子学与计算机》2023年第6期85-89,共5页Microelectronics & Computer

基　　金：国防科技重点研发项目(1905WX0006)。

摘　　要：电流/频率转换器主要是对加速度计输出电流进行高精度测量,典型展宽复位电荷平衡式电流/频率转换器的逻辑控制方法对精度影响较大.针对典型逻辑控制方法的不足,提出了一种新的逻辑控制方法.电路积分器输出通过一级D触发器作为比较电路实现模拟数字转换输出,然后通过二级D触发器和与门形成的自锁电路产生计数器启动触发脉冲,最后通过计数器电路计数形成开关控制逻辑.新方法避免了典型方法中对积分时间的约束,减小了大电流输入和小电流输入时积分器输出波形的平均值差异,从而有效提高了电路精度.对同一个硬件电路通过编写不同的CPLD算法程序进行性能对比测试,结果表明新的方法比典型的方法使电路精度得到明显提升.The current/frequency converter is mainly used to measure the output current of accelerometers,the logic control method of typical extended width reset charge balance current/frequency converter has a great influence on the accuracy.To overcome the control logic shortage of typical logic control method,a new logic control method is given.The integrator output of the circuit realizes the analog-to-digital conversion output through the primary D trigger as the comparison circuit,then the counter start trigger pulse is generated by the self-locking circuit formed by the second D trigger and the and gate,finally the switch control logic is formed by counting of the counter circuit.The new method avoids the constraint of integration time in typical method,and reduces the difference of the average value of the integrator output waveform between high current input and low current input,thus the circuit accuracy is effectively improved.The performance of the same hardware circuit is tested by writing different CPLD algorithmic programs,the results show that the new method can significantly improve the circuit accuracy compared with the typical method.

关 键 词：电荷平衡 电流/频率 逻辑控制 积分时间 

分 类 号：TN402[电子电信—微电子学与固体电子学]