电子器件2018，Vol.41Issue(2)：395-399,5.DOI:10.3969/j.issn.1005-9490.2018.02.023
电缆分布电容引起的宽带放大电路自激振荡探讨
Discussion on Self-Excited Oscillation of Broadband Amplifier Caused by SMA Long Cable Distributed Capacitance
黄明 1丁照雨 1李争平 1徐德仁1
作者信息
- 1. 北方工业大学电子信息工程学院,北京100144
- 折叠
摘要
Abstract
Aiming at the phenomenon that the SMA cable in the broadband amplifier circuit is easy to cause self-oscillation,the influence of the distributed capacitance on the performance of the operational amplifier is studied, and a solution to the 50 Ω resistor between the output terminal and the load capacitance is proposed. Amplification circuit's design uses TI's OPA691 chip,according to the Tina simulation analysis for frequency response of the capacitive load drive circuit,it shows that when the capacitive load is added,the 50 Ω resistor can make -180 ° phase amplitude to -12.26 dB,much smaller than 0 dB. In the circuit measurement self-oscillation disappeared,the rationality of the solution has been verified.关键词
运算放大电路/容性负载/自激振荡/频率响应/负反馈Key words
operational amplifier/capacitive load/self-oscillation/frequency response/negative feedback分类
信息技术与安全科学引用本文复制引用
黄明,丁照雨,李争平,徐德仁..电缆分布电容引起的宽带放大电路自激振荡探讨[J].电子器件,2018,41(2):395-399,5.
