摘要
本设计由宽带放大器OPA847、压控放大器VCA824和电流型运放OPA695构成射频宽带放大电路。放大电路前级由OPA847实现20 d B放大,中间级由压控放大器VCA824实现0. 05 V/V～5 V/V的增益变化,后级由OPA695和继电器实现5 V/V～25 V/V的增益变化,末级由电阻网络进行20 dB衰减,达到在0dB～60dB增益范围内可调。
The system is designed with a broadband amplifier OPA847,voltage controlled amplifier VCA824 and current-feedback operational amplifier OPA695.In the first stage,the system can achieve 20 dB fixed-gain by OPA847.Then,in the intermediate stage,it uses VCA824 to achieve 0.05~5V/V gain range.In the latter part,the system achieves 5~25V/V gain variation by OPA695 and relays.In the last stage,the system achieves 20dB attenuation by the resistor network,so that the overall gain can be adjusted in the range of 0~60dB.
作者
杨成林
Yang Chenglin(Xinzhou Medium Wave Broadcasting Station,Shanxi Province Press and Publication Radio and Television Bureau,Taiyuan Xinzhou 034000,China)
出处
《山西电子技术》
2018年第6期67-70,共4页
Shanxi Electronic Technology
作者简介
杨成林(1966-),男,山西原平人,工程师,从事专业:中波广播发射。
