Abstract
AbstractMultifeedback active circuits are simpler and have low element sensitivity for passive elements; and since they can easily be compensated to operate at higher frequencies, they are among the useful circuits for basic biquad section.Various high‐frequency compensation techniques have been reported which compensate for the finite GB product of an operational amplifier by the passive circuit, but the circuit design should consider the effect of input capacitance.This paper proposes a multifeedback active circuit in which high‐frequency operation can be obtained by compensating the effect of finite GB product and input capacitance of the operational amplifier. The proposed circuit is studied to obtain the pole sensitivity with respect to the GB product.The spread of circuit element values and the influence of the secondary pole of the operational amplifier are discussed, and the compensation for the circuit is proposed. Finally, a fifth‐order lowpass filter with f0 = 100 kHz and passband ripple of 0.1 dB is designed, and its operation is confirmed through experiment.
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