宜宾学院学报
宜賓學院學報
의빈학원학보
JOURNAL OF YIBIN UNIVERSITY
2011年
6期
48-52
,共5页
徐娟%周启忠%岳琨%刘伟平
徐娟%週啟忠%嶽琨%劉偉平
서연%주계충%악곤%류위평
噪声%宽带直流放大器%增益%零点漂移
譟聲%寬帶直流放大器%增益%零點漂移
조성%관대직류방대기%증익%영점표이
noise%wideband direct current amplifier%gain%zero drift
为解决小信号易受干扰、难以实现线性放大的问题,以MSP430F247单片机为控制核心,采用压控可变增益宽带放大器VCA820作为程控增益放大器,设计了一个低噪声宽直流放大器.系统能对直流到20MHz的信号,实现增益从0dB到80dB范围内以1dB为步进的程控放大,带内增益起伏小于0.5dB,50负载时输出信号峰-峰值高达30V.系统的零点漂移小,工作带宽高,驱动能力强,性能稳定,可广泛应用于传感器网络和通信设备等电路中.
為解決小信號易受榦擾、難以實現線性放大的問題,以MSP430F247單片機為控製覈心,採用壓控可變增益寬帶放大器VCA820作為程控增益放大器,設計瞭一箇低譟聲寬直流放大器.繫統能對直流到20MHz的信號,實現增益從0dB到80dB範圍內以1dB為步進的程控放大,帶內增益起伏小于0.5dB,50負載時輸齣信號峰-峰值高達30V.繫統的零點漂移小,工作帶寬高,驅動能力彊,性能穩定,可廣汎應用于傳感器網絡和通信設備等電路中.
위해결소신호역수간우、난이실현선성방대적문제,이MSP430F247단편궤위공제핵심,채용압공가변증익관대방대기VCA820작위정공증익방대기,설계료일개저조성관직류방대기.계통능대직류도20MHz적신호,실현증익종0dB도80dB범위내이1dB위보진적정공방대,대내증익기복소우0.5dB,50부재시수출신호봉-봉치고체30V.계통적영점표이소,공작대관고,구동능력강,성능은정,가엄범응용우전감기망락화통신설비등전로중.
To solve the problem that small signals are easily disturbed and difficult to be amplified,a low noise and wideband direct current programmable amplifier is designed with the single-chip computer MSP430F247 as the control core,and with voltage-controlled variable gain wideband amplifier VCA820 as a programmable gain amplifier.The signals from 0Hz to 20MHz can be programmably amplified from the range of 0dB to 80dB with the step of 1dB.The in-band gain variation is less than 0.5Db.The signal peak-peak value of 50 ohm load output is up to 30 volts.The system is of small zero drift,wide bandwidth,high-driven capability and stable performance.This design can be widely applied in communications equipment and sensor networks.