Bandpass RC filters of the second-order based on the micropower two-component differential stages

The article considers a new circuitry of the second-order bandpass RC filter on the base of the JFETs, BiJ and CMOS transistors, their special inclusion in a structure of nontraditional double-element differential stages (DSs). The main analytical expressions, setting the interrelation of the parameters of BF and characteristics of the active and passive components, are given. The main feature of the suggested circuit solutions is low currents of consumption in the steady-state behavior, which are determined by the geometrical dimensions of the applied FETs channels. In case of necessity the DC current of transistors can also be set due to the entering of the additional resistor of the local negative feedback to the circuit of DS. The computer simulation results of the practical circuit of BF for XFab process are given.

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