Abstract
A universal active biquad using the four-terminal floating nullors (FTFNs) is presented. The propsed circuit uses two FTFNs, three capacitors and two resistors. The proposed circuit has three input voltages and can simultaneously provide a high-impedance output current and/or an output voltage. Without changing the circuit topology, the output voltage can realise lowpass, highpass, bandpass, notch and allpass transfer functions and the output current can realise bandpass and highpass transfer functions. The proposed circuit enjoys low active and passive sensitivities and independent control of the parametersωoandω0/Q0.
Highlights
The four-terminal floating nullor (FTFN) is a more flexible and versatile building block than the operational amplifier and the currentconveyor [1,2,3,4]
A stable grounded-capacitor first-order allpass filter using an FTFN was proposed by Higashimura [4]
A current-mode configuration using two FTFNs was presented by Liu and Lee [9]
Summary
King Fahd University of Petroleum and Minerals, Box 203, Dhahran 31261, Saudi Arabia (Received 7 July 1997; In finalform 3 November 1997). A universal active biquad using the four-terminal floating nullors (FTFNs) is presented. The propsed circuit uses two FTFNs, three capacitors and two resistors. The proposed circuit has three input voltages and can simultaneously provide a high-impedance output current and/or an output voltage. Without changing the circuit topology, the output voltage can realise lowpass, highpass, bandpass, notch and allpass transfer functions and the output current can realise bandpass and highpass transfer functions. The proposed circuit enjoys low active and passive sensitivities and independent control of the parameters Vo and ovo/Qo
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