A High Input Impedance OTA-CUniversal Biquad Filter

摘要

A high input impedance OTA-C universal biquad filter configuration ispresented in this paper. The circuit uses three OTAs and two capacitors.The circuit is capable of realizing all standard filter transfer function, i.e.low pass high pass, band pass, notch and all pass filters. The circuit has theattractive features of wide range electronic tunability of its pole frequency,bandwidth and pole Q. In addition, the circuit enjoys excellent sensitivityperformance. The proposed circuit has no requirement for componentmatching conditions except for low pass filter.