程控增益放大器 程控可变增益射频宽带放大器.doc

程控增益放大器 程控可变增益射频宽带放大器 导读：就爱阅读网友为您分享以下“程控可变增益射频宽带放大器”的资讯，希望对您有所帮助，感谢您对92的支持! 程控可变增益放大器 参赛队员： 摘要 本系统由宽带放大器OPA847、压控放大器VCA810和电流型运放OPA695组成。系统前级通过OPA847实现10倍固定增益放大，中间级由压控放大器VCA810实现0.05~5V/V增益变化，后级由OPA695和继电器实现5~25V/V增益变化，末级由电阻网络进行10倍衰减，达到0dB~60dB增益范围可调。系统采用屏蔽盒进行电磁屏蔽，提高稳定性和抗干扰能力。经测试，系统达到了题目所设定的所有指标。 关键词：放大器， Abstract The system is designed with a broadband amplifier OPA847, Voltage controlled VCA810， OPA847 ，OPA695 amplifierVCA810 and current-feedback operational amplifier OPA695.In the first stage, the system can achieve 10 times fixed-gain by OPA847.Then, in the intermediate stage, it uses VCA810 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 10 times attenuation by the resistor network, so that the overall gain can be adjusted in the range of 0~60dB.In order to improve the stability and anti-jamming capability, the systemuses the shield case to carry electromagnetic shielding. According to the test,all the indicators of the topic have reached . 目录 1、 方案论证 1.1、 ≥60dB增益设计 1.2、放大增益可调设计 1.3、系统框图 2、理论分析与计算 2.1、宽带放大器设计 2.2