Abstract :
The transfer matrices of linear bilateral and unilateral networks are distinguished by the vanishing of the determinant of the matrix, in the case of the latter, and the non-existence of the matrix of the reversed four-pole. Illustrative examples are given. The voltage gain, current gain, input impedance and output impedance of a four-pole are deduced in terms of the transfer matrix elements. Expressions are developed for the transfer matrices of the four-poles resulting from combining pairs of four-poles, which may be either bilateral or unilateral, in parallel - parallel, in series - parallel and in series - series connection. These expressions are used to obtain the transfer matrices of some passive and active networks, including feedback amplifiers, to illustrate the possibilities of the technique.
