中圖分類號：U666.12 文獻標(biāo)志碼：A DOI: 10.16157/j.issn.0258-7998.223356 中文引用格式： 汪金華，游超，莊永河，等. 一種低功耗電流/頻率轉(zhuǎn)換電路零偏補償方法[J]. 電子技術(shù)應(yīng)用，2023，49(7)：130-133. 英文引用格式： Wang Jinhua，You Chao，Zhuang Yonghe，et al. A zero offset compensation method for low power current/frequency conversion circuit[J]. Application of Electronic Technique，2023，49(7)：130-133.
A zero offset compensation method for low power current/frequency conversion circuit
Wang Jinhua，You Chao，Zhuang Yonghe，Yang Yang，Li Honggao，Wu Xiangdong
(Anhui Province Key Laboratory of Micro System， The 43rd Research Institute of CETC， Hefei 230088， China)
Abstract： The current/frequency conversion circuit is mainly used to measure the output current of accelerometers in inertial navigation system, and at present the typical current frequency conversion circuit consumes so much power, which limits its application scope. Shunt circuit is usually used to design low power current/frequency circuit, however this method will bring large zero bias error, which affects the accuracy of circuit measurement. The reasons that affect the zero bias of low power current frequency conversion circuit are analyzed, and a method to realize zero offset compensation by single chip microcomputer is presented, it only needs to load the program several times to realize iterative compensation, through coarse compensation for three typical temperature points and fine compensation for the whole temperature range, and it is convenient to realize high-precision zero offset compensation. The experiments show the zero offset of the designed product at whole temperature is less than 0.15 Hz, and the power consumption is 1/5 of that of typical circuit, which has high engineering application value and good market prospect.
Key words : current/frequency conversion；low power；single chip microcomputer；zero offset compensation
