运算放大器特性参数偏差对控制系统稳定性的影响分析

The Impact Analysis of Opertional Amplifier Characteristic Parameters on System Stability

摘要:

对一种运算放大器AD8692(以下简称运放)的特性参数偏差对整机控制稳定性的影响机理进行了研究,运放在整机中用于处理器前级对位移闭环控制信号的处理,实验证明,运放特性参数偏差会引起位移信号自激振荡,进而导致整机性能下降,系统失稳。对标GJB 9147进行运放各项参数的系统测试和分析,找出了影响闭环控制稳定性的参数,并对多批运放的性能参数进行了对比测试,验证了参数分析的正确性和普适性。经实验测试提出了运放性能参数的测试筛选控制措施,对装机器件的性能控制提供了有效手段。

Abstract:

The paper do research on the impact of the Amplifier AD8692 characteristic parameter of the stability whole control system. The Amplifier AD8692 is used in the system to deal with the feedback shifting signal. The experiment proved that, the Amplifier AD8692 characteristic parameter departure may cause self-oscillation, and then the performance of the complete device descended, meanwhile the system became unstable . Several batches of Amplifier were tested and contrasted,and confirmed that it is by the Amplifier open loop gain being too large。The devices should be selected by the parameters before they are fixed。