Two-port network

In <a href="/facts/Electronics/E4JhgISq">electronics</a>, a two-port network (a kind of four-terminal network or quadripole) is an <a href="/facts/Electrical_network/zt94kTW0">electrical network</a> (i.e. a circuit) or device with two pairs of <a href="/facts/Terminal_(electronics)/CwbKGSuB">terminals</a> to connect to external circuits. Two terminals constitute a <a href="/facts/Port_(circuit_theory)/g2mokqv0">port</a> if the <a href="/facts/Electric_current/Dc1xdnUX">currents</a> applied to them satisfy the essential requirement known as the port condition: the current entering one terminal must equal the current emerging from the other terminal on the same port. The ports constitute interfaces where the network connects to other networks, the points where signals are applied or outputs are taken. In a two-port network, often port 1 is considered the input port and port 2 is considered the output port.
It is commonly used in mathematical <a href="/facts/Network_analysis_(electrical_circuits)/IjmVqbG8">circuit analysis</a>.

Two-port network open-in-new

Two-port network