Universal biquad filter topology using low‐voltage current mirrors

SUMMARY A single input multiple output biquad filter topology realized using current mirrors as active elements is introduced in this manuscript. The proposed topology simultaneously realizes all the standard transfer functions of a biquad filter without modifying its structure. Some attractive characteristics offered by the proposed topology are the employment of only grounded capacitors as passive elements, the electronic adjustment of the resonant frequency, and the capability for operation under a low‐voltage environment. The operation of the proposed topology has been validated through simulation results, where the most important performance factors have been evaluated in the case of a bandpass filter transfer function.