A High Input Impedance OTA-C Universal Biquad Filter
K. Kumar and K. Pal
A high input impedance OTA-C universal biquad filter configuration is presented 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 the attractive features of wide range electronic tunability of its pole frequency, bandwidth and pole Q. In addition, the circuit enjoys excellent sensitivity performance. The proposed circuit has no requirement for component matching conditions except for low pass filter.
Keywords: OTA-C univeral biquad filter