A notch filter employing current differencing operational amplifier
J.H. Brodie · International Journal of Electronics · 1976
A realization of a notch filter based on analogue computing techniques but employing current, differencing operational amplifiers is presented. The realization is canonic with respect to the number of operational amplifiers and passive components except for two bias resistors. An attempt is made to assess theoretically the performance of the filter and compare this with measured performance. A comparison is also made with a gyrator-derived version over which it is assessed to have superior notch rejection under the circumstances considered.