A High-Frequency Active RC Filter Based on Pole Sensitivity to the GB Product

摘要

If a general purpose operational amplifier is treated as an ideal model in constructing an active RC filter, the filter performance begins to degrade at several kHz, de- pending on the frequency realized and Q. The main cause is the finite GB product; the second order poles, the output resistance and the input capacitance may be secondary factors. In this paper, a previously reported filter, using a non-inverting amplifier and compensating only for the GB product, is treated.