电子测试
電子測試
전자측시
Electronic Test
2015年
19期
19-22
,共4页
郭小凤%刘帅%李楠楠%宋洪叶
郭小鳳%劉帥%李楠楠%宋洪葉
곽소봉%류수%리남남%송홍협
OPA842%VCA824%射频放大器%可变增益放大器
OPA842%VCA824%射頻放大器%可變增益放大器
OPA842%VCA824%사빈방대기%가변증익방대기
OPA842%VCA824%RFamplifie%Variable gain amplifier
该系统是由宽带放大器OPA842、可变增益放大器VCA824以及电流型运放THS3202组合而成的增益可控射频放大器，可实现12dB~40dB增益步进可调。系统由三级构成。OPA842实现两倍固定增益放大构成前级放大器，对输入信号做放大处理。中间级电压增益控制和增益步长控制电路由VCA824通过DA模块实现。末级由THS3202实现功率放大输出。该系统使用同轴线输入信号，最大限度地降低外部干扰。经测试，整个系统性能稳定，控制效果好。
該繫統是由寬帶放大器OPA842、可變增益放大器VCA824以及電流型運放THS3202組閤而成的增益可控射頻放大器，可實現12dB~40dB增益步進可調。繫統由三級構成。OPA842實現兩倍固定增益放大構成前級放大器，對輸入信號做放大處理。中間級電壓增益控製和增益步長控製電路由VCA824通過DA模塊實現。末級由THS3202實現功率放大輸齣。該繫統使用同軸線輸入信號，最大限度地降低外部榦擾。經測試，整箇繫統性能穩定，控製效果好。
해계통시유관대방대기OPA842、가변증익방대기VCA824이급전류형운방THS3202조합이성적증익가공사빈방대기，가실현12dB~40dB증익보진가조。계통유삼급구성。OPA842실현량배고정증익방대구성전급방대기，대수입신호주방대처리。중간급전압증익공제화증익보장공제전로유VCA824통과DA모괴실현。말급유THS3202실현공솔방대수출。해계통사용동축선수입신호，최대한도지강저외부간우。경측시，정개계통성능은정，공제효과호。
The system composed of broadband amplifier OPA842,variable gain amplifier VCA824 and current gain amplifier THS3202 is controllable RF amplifier gain.Rf amplifier gain can be adjusted step-by-step from 12dB to 40 dB. The system consists of three level.Prime amplifier competed by OPA842 realizes 2 times fixed gain amplification to enlarge the input signal.Intermediate level gets command of voltage gain and gain step length by VCA824 and DA model.The last level implemented power amplifier output through THS3202. The input signal is given by coaxial line and reduce the external interference to the limit.After testing, the whole system has stable performance and good control effect.
