A new single operational amplifier active RC bandpass network with reduced sensitivity to amplifier gain‐bandwidth product

Abstract

AbstractA new configuration for realizing a low sensitivity active RC bandpass filter suitable for hybrid integrated realization is given. The network consists of a single operational amplifier (OA) and two identical passive RC bandpass building blocks. The active element sensitivities are given. The frequency limitation equations of the filter based on the one‐pole rolloff model of the OA are derived. It is found that the choice of the element ratios of the passive RC networks plays an important role in the overall performance of the active resonator. Two cases are discussed in detail: one has the advantage of having better element ratios, and the other has the advantage of having lower sensitivities. The given network is less sensitive to the amplifier' gain‐bandwidth product than other low sensitivity active RC bandpass networks using two operational amplifiers.