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Large-signal frequency responses of 2nd-order filters containing multiple amplifiers

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2 Author(s)
A. S. S. Al-Kabbani ; United Arab Emirates University, College of Engineering, Al-Ain, United Arab Emirates ; P. Bowron

The describing-function technique is extended to predict the large-signal performance of active filters containing any number of operational amplifiers. This is achieved by generalising the theory of active filters whose amplifiers are each represented by a dominant pole and a saturation nonlinearity. As examples, the jump-resonance amplitude and phase characteristics of several popular 3-amplifier 2nd-order bandpass filter circuits are then evaluated and compared. The conditional-stability problem appears to be more severe than for single- and double-amplifier filters.

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IEE Proceedings G - Electronic Circuits and Systems  (Volume:134 ,  Issue: 5 )