CDTA based universal transadmittance filter

A new transadmittance-mode (TM) universal filter with three inputs and a single output is presented. The circuit employs only two current differencing transconductance amplifiers (CDTAs), two capacitors one of which is permanently grounded and as many resistors. The proposed circuit realizes lowpass (LP), highpass (HP), bandpass (BP), notch and allpass (AP) functions from the same configuration. Both the active and passive sensitivities are no more than unity. The natural frequency ω_o and bandwidth ω_o/Q are independently and electronically tunable. PSPICE simulation results are included.