摘要
为了提高加速度计转换电路的转换精度，减小非线性和对称性误差，减小测量误差，提出了一种双频加速度计转换电路设计方案。在I／F＋AD数字处理的电路设计的基础上，以一种频率I／F转换，另一种频率AD采样，通过逻辑控制和数字处理，得到较高的转换精度。同原电路相比，提高了转换分辨率和动态转换特性。经试验验证，精度可以达到1．0E-05g。
A double- frequency controlled circuit is presented in this paper. This circuit is based on I/F conversion circuit. However, a chip of AD converter is added. Double frequencies are used in this circuit, one for I/F conversion circuit and the other for AD converter. The design can improve the resolution and dynamic performance of conversion circuit, re- duce measurement error and decrease non - linear error and symmetry error. An experiment is followed. The experiment re- suits show that the measurement precision could be up to 1.0×10^-5g.
关键词
双频
逻辑控制
动态转换
分辨率
double-frequency
logic control
dynamic conversion
resolution
