16.2 EQUIVALENT CIRCUITS FOR A TWO-PORT NETWORK
The describing equations for a memoryless linear time-invariant two-port network using y-parameters is given by
The left side of the equations consists of currents. Hence, the terms on the right-side must also be currents. Consider the first equation. We can see that the term y11v1 represents the current drawn by an admittance of y11 from the port-voltage v1. Hence, this term can be accounted for by connecting an admittance of y11 across the first port. However, the second term represents a current drawn from the first port with the value of this current decided by the second port-voltage. ...
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