Abstract
Improvements in the performance of the basic current-differencing operational amplifier (CDOA) enable a basic all-pass filter section, having high performance in the 300–3400 Hz range, to be simply designed. Furthermore, one amplifier may be eliminated from the basic design as a method of reducing undesirable effects of active device parameters, but with some added design problems. Performance details of the circuits are given, together with a theoretical assessment of the effects of parasities performance.
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