Active filters can be designed using operational amplifiers with resistors as the only external components. The reactance of these filters is derived from the parasitic capacitances associated with the amplifiers. For internally compensated amplifiers the integrator model is employed Some basic blocks are presented in this paper. These would serve to realize a variety of active circuits when the signal flow graph of the desired transfer function is drawn.
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Li et al. (1979) studied this question.
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