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本文提出用两个运算放大器和五个电阻组成的有源R二阶滤波器的两种电路。第一种电路具有带通,低通和对称带阻传输特性,第二种电路具有带通、低通和高通传输特性。两种电路的极点参数ω_0,Q和增益均由相应电阻比来确定。两种电路带通传输的中心频率、3dB带宽和中频增益均可分别独立调节。两种网络对全部有源参量和无源参量呈现很低的灵敏度。实验结果与设计值基本符合。
This paper proposes two circuits of an active R second-order filter composed of two operational amplifiers and five resistors. The first circuit has band pass, low pass and symmetric band-stop transmission characteristics, and the second circuit has band pass, low pass, and high pass transmission characteristics. The pole parameters ω_0, Q and gain of the two circuits are determined by the corresponding resistance ratio. Two kinds of circuit band-pass transmission center frequency, 3dB bandwidth and the intermediate frequency gain can be adjusted independently. Both networks exhibit low sensitivity for all active and passive parameters. Experimental results and the design value of the basic line.