Voltage gain by external resistor Rf and Rin the ratio of the decision.
电压增益由外接电阻Rf与Rin的比值决定。
Current is established with one external resistor and no other parts are required.
它只需一只外接电阻就可设定所需的电流值。
The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.
对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。
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