Chapter 4. S-Parameters and Noise Parameters
4.1 S-Parameters
A two-port network is a circuit that has two accessible ports. A port is a pair of terminals that satisfies a port condition. The port condition requires that the current flowing into one port’s terminal should be equal to that flowing out of the other port’s terminal. Among multiport networks, a two-port network may be the basic building block for composite functional circuits. Reference directions for the port variables, such as port currents and voltages, will usually be defined as shown in Figure 4.1(a). Generally, this kind of two-port network is represented by two-port parameters that use the ...
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