Synthesis of Transformerless Active N-Port Networks

The development of the transistor has provided the network synthesist with an efficient low-cost active element and has stimulated considerable interest in the theory of active RC networks during the last decade. Several techniques have been proposed for the transformerless active RC realization of transfer and driving-point functions.1"18 It has, in fact, been established that any real rational fraction (in the complex frequency variable) can be realized as the transfer or driving-point function of a transformerless active RC network containing one active element. In particular, Linvill's technique 3 has been the basis for much of the later work. 761 772 THE 13ELL SYSTEM TECHNICAL JOURNAL, MAY 1961 Fig. 1 -- Realization of an a r b i t r a r y A T X N s y m m e t r i c i m m i t t a n c e m a t r i x .