Independent Tunable-Q Current-mode OTA-C Universal Filter

An OTA-C current-mode universal filter with independent tunable-Q realized by band-reject function is proposed. The proposed circuit employs OTAs and grounded capacitors. The parameter Q_P can be tuned independently from omega_P. However, the other different kinds filter function as low-pass, high-pass, band-pass and band-reject response can be also obtained without changing circuit topology. The parameters omega_P and Q_p can be electronically tuned through adjusting the transconductance gains of the OTAs. Moreover, the parameter Q_p can be also tuned by changing component manually without effect to the omega_P The simulation results have been carried out by PSpice