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On a family of new two‐op‐amp switched‐capacitor biquads for high‐frequency applications
Author(s) -
Mulawka J. J.,
Konczykowska A. D.,
Bon M. L.
Publication year - 1990
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490180403
Subject(s) - switched capacitor , operational amplifier , transfer function , capacitor , electronic circuit , control theory (sociology) , electronic engineering , integrator , computer science , topology (electrical circuits) , engineering , amplifier , electrical engineering , cmos , voltage , control (management) , artificial intelligence
This paper presents three novel biquads derived by applying the concept of so‐called basic elements for switched‐capacitor (SC) circuits. These biquads are without continuous feedback and comprise two op‐amps. They were derived assuming a transfer function denominator of the same form as the Fleischer‐Laker type E circuit. It is shown that by a simple modification of the switching arrangement, i.e. by changing the type of the basic SC element, the effect of the amplifier finite gain on the performance of SC filters can be significantly reduced. the efficiency of this approach has been established by extensive simulation studies using the dedicated symbolic analysis program SCYMBAL. Design equations and comparison with already known biquads of this type are presented. Examples are provided to demonstrate that the proposed circuits require a low total capacitance while finite‐gain effects are considerably reduced.