带宽可编程高速跟踪滤波器的研制

针对文献（3）的不足之处,分析了光电传感器的工作原理及其信号特点,设计了锁相倍频电路的预偏电路及环路滤波器自适应变带宽电路,缩短了捕捉时间,提高了跟踪精度。对开关电容带通滤波器的通带进行编程,进一步提高了抗干扰能力,拓宽了它的使用范围。

Development of Programmable Band Width and High Speed Following up Band Pass Filter

To counter the defect of reference 3], the principle and the signal characteristic of the sensor are analyzed. The bias circuit of the PLL (phase-locked loop) multiple frequency loop and the self-adapting change band-width circuit of the loop filter are designed. With this instrument the catch time of the PLL is shortened, and the following up precision of the band pass filter is raised. The anti-interference ability is improved because of the programming of the pass band of the switch-capacitor band pass filter, and the used range is expended.