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Unified active filter biquad structures

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3 Author(s)
Chang, C.-M. ; Electron. Syst. Design Group, Univ. of Southampton, UK ; Al-Hashimi, B.M. ; Ross, J.N.

The authors present a new biquad filter model based on ators, norators, current mirrors and passive R (resistor) and C (capacitor) elements. Two implementations derived from the new biquad filter model by using second generation current-controlled conveyors (CCCIIs) and operational transconductance amplifiers (OTAs) are also proposed. The two biquad implementations are capable of achieving five important filter performance parameters simultaneously and without trade-offs, including universal filtering, minimum components count and independent control of ωo and ωo/Q. This is unlike recently reported filter structures which make certain trade-offs that emphasise some parameters at the cost of others. Simulation results are included confirming the theoretical prediction.

Published in:

Circuits, Devices and Systems, IEE Proceedings -  (Volume:151 ,  Issue: 4 )