CAJ | 학술논문

在测量电路中，往往需要对一些微弱的信号进行采集放大，以便于对其进行分析计算，为了得到精度较高、动态范围较大的放大电路，本系统采用程控高增益放大器，并以按指数衰减正弦波信号源作为系统测试输入信号。程控高增益放大器由固定增益放大器和以DAC7541为核心构成的程控放大器两部分组成；程控选频网络以状态变量滤波器为核心，以DAC7800内部权电阻网络作为可调电阻实现中心频率精确控制。系统以 MSP430单片机为控制核心，工作稳定可靠、具有较高的性能指标。
재측량전로중，왕왕수요대일사미약적신호진행채집방대，이편우대기진행분석계산，위료득도정도교고、동태범위교대적방대전로，본계통채용정공고증익방대기，병이안지수쇠감정현파신호원작위계통측시수입신호。정공고증익방대기유고정증익방대기화이DAC7541위핵심구성적정공방대기량부분조성；정공선빈망락이상태변량려파기위핵심，이DAC7800내부권전조망락작위가조전조실현중심빈솔정학공제。계통이 MSP430단편궤위공제핵심，공작은정가고、구유교고적성능지표。
In the measurement circuit, it is often required to some weak signal collection, in order to enlarge the calculation and analysis, in order to get higher precision, dynamic range larger amplifying circuit, this system USES program-controlled high-gain ones.the amplifiers, and with exponentially decreasing sine wave signal source as system test the input signal. SPC high-gain ones.the amplifier by fixed gain amplifier and to DAC7541 for core SPC amplifier two parts;SPC frequency selective network with state variable filters as the core, with DAC7800 internal resistance network as a variable resistor realize accurate control center frequency. System to MSP430 microcontroller as control core, stable and reliable, high performance indicators.