射频放大器
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2015-06-05
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射频宽带放大器（D 题）
作者：郭培培 韩家斌 茹田力（中国地质大学（武汉））
赛前辅导教师：赵 娟 文稿整理辅导教师：赵 娟
摘 要
本系统由宽带放大器 OPA847、压控放大器 VCA824 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
VCA824 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：射频放大器， VCA824， OPA847，OPA695
Abstract
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 10 times 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 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 system uses the shield case to carry electromagnetic shielding. According
to the test, all the indicators of the topic have reached .
Keywords：RF broadband amplifier，VCA824，OPA847，OPA695
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