Abstract
A new current-mode universal filter is presented. The proposed filter uses three four-terminal floating nullors (FTFNs), three grounded capacitors, and four grounded resistors. The proposed filter has three inputs and one output and can realize lowpass, highpass, bandpass, notch, and allpass transfer functions without changing the circuit topology. The proposed filter enjoys low active and passive sensitivities and independent control of the parametersω0andω0Q0using grounded elements.
Highlights
The four-terminal floating nullor (FrFN) is a more flexible and versatile building block than the operational amplifier and the current-conveyor 13]
We present a new current-mode biquad filter structure using three FFFNs, three grounded capacitors and four grounded resistors
All the passive elements are grounded ii
Summary
The four-terminal floating nullor (FrFN) is a more flexible and versatile building block than the operational amplifier and the current-conveyor 13]. In [8], a cascadable current-mode configuration using single FrFN is presented This configuration can realize second-order lowpass, highpass, bandpass, notch, and. In [9], a current-mode configuration using two FTFNs is presented This configuration enjoys low active and passive sensitivities and can simultaneously realize lowpas/bandpass, or highpass/bandpass or bandpass/notch filters using two grounded capacitors. In 10], a cascadable current-mode configuration using single FTFN enjoying low active and passive sensitivities is presented This configuration can realize second-order lowpass, highpass, bandpass, allpass, and notch filters using six passive elements at most. These five filters, cannot be realized without changing the circuit topology to achieve a specific filter function. The proposed circuit enjoys the attractive features of low active and passive sensitivities and the independent control of the parameters o0 and to0/Q0 using grounded elements
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