Extension to multi-access circuits
Linear circuits - Parametric representation

The notion of parametric representation can be extended to a multi-access circuit under the same conditions as in the case of a quadripole:

• no independent sources in the circuit ;

• for each access, the current entering one terminal exits through the other terminal.

Let there be an n-port circuit satisfying the above conditions. We define, for each access k, the 2 n quantities V_k and I_k. Since the circuit is linear, n quantities can be expressed in linear form as a function of n others. For example, we define the Z parameters of the n-port circuit by expressing voltages as a function of currents: