CAJ | 학술논문

在微弱信号检测中,当输入信号变化范围很大时,固定增益放大电路不能满足要求,必须采用自动增益控制(AGC)电路。在对 AGC电路进行研究后,提出了一种低成本的 AGC 电路,仅采用1个LM324集成块。其中,二级运放放大输入信号,一级运放产生控制电压。实验表明,电路增益在43~68 dB之间自动变化,AGC 控制达到25 dB。可作为一般弱信号检测放大电路。
재미약신호검측중,당수입신호변화범위흔대시,고정증익방대전로불능만족요구,필수채용자동증익공제(AGC)전로。재대 AGC전로진행연구후,제출료일충저성본적 AGC 전로,부채용1개LM324집성괴。기중,이급운방방대수입신호,일급운방산생공제전압。실험표명,전로증익재43~68 dB지간자동변화,AGC 공제체도25 dB。가작위일반약신호검측방대전로。
When the input signal range is very big in weak signal detection,fixed gain amplifier circuit cannot meet the requirements,must adopt automatic gain control (AGC ) circuit.After the study of AGC circuit,puts forward a low cost of AGC circuit,with a LM324 integration block only, among them,the two stage operational amplifier input signal,the level of op amp produces the control voltage. Experimental results show that the circuit gain automatic change between 43 dB and 68 dB,AGC control range of 25 dB amplifier circuit can be used as general weak signal detec-tion.