基于辨识算法的电荷放大器动态特性补偿

Charge Characteristic Dynamic Compensation Based on Identification Algorithm

用于采集冲击振动信号的传感器输出具有上升时间短,峰值高的特点,一般模拟电路的动态特性难以满足瞬态测试要求,且依据电路理论所计算的传递函数以及分析传递函数所做出的动态特性补偿也只是停留在理论可行的层面,实际效果差强人意。针对以上问题,提出了将系统辨识理论以及反滤波技术应用于模拟电路的方法。该方法将系统辨识运用到放大电路,可以较为准确的得到电路的传递函数,通过此传递函数可以有效提高电路的动态性能。通过试验证明该补偿方法能有效改善放大电路的幅频特性和相频特性,极大地提高测试系统的动态性能。

The output of the sensor used to collect the shock signal has the characteristics of short rise time and high peak value,and it is difficult to collect.The dynamic characteristics of the general analog circuit are difficult to meet the transient testing requirements,and the transfer function calculated according to the circuit theory and the compensation of dynamic characteristics are still stay at the level of theoretical feasibility,of which the actual effect is not satisfactory.Aiming at the above series of problems,a method of applying system identification theory and inverse filtering technique to analog circuits was proposed.This method improved the dynamic performance of the charge amplifying circuit,combined experimental testing with theoretical modeling,and determined a model that is closest to the identified system.According to this model,the circuit is subsequently compensated to improve the dynamic performance of the charge amplifier circuit.It has been verified by experiments that the system identification can be applied to the circuit more accurately to obtain the transfer function of the circuit,through which the dynamic performance such as amplitude-frequency and phase-frequency characteristics of the circuit can be successfully improved.