# Linear Circuit

A linear circuit is an electronic circuit in which, for a sinusoidal input voltage of frequency f, any steady-state output of the circuit (the current through any component, or the voltage between any two points) is also sinusoidal with frequency f. Note that the output need not be in phase with the input.

An equivalent definition of a linear circuit is that it obeys the superposition principle. This means that the output of the circuit F(x) when a linear combination of signals ax1(t) + bx2(t) is applied to it is equal to the linear combination of the outputs due to the signals x1(t) and x2(t) applied separately:

Informally, a linear circuit is one in which the values of the electronic components, the resistance, capacitance, inductance, gain, etc. don't change with the level of voltage or current in the circuit.

### Other articles related to "linear circuit, circuits, linear, circuit":

Linear Circuit - Small Signal Approximation
... So in analysing many circuits where the signal levels are small, for example those in TV and radio receivers, nonlinear elements can be replaced with a linear small-signal model ... Conversely, many linear circuit elements show nonlinearity as the signal level is increased ... If nothing else, the power supply voltage to the circuit usually puts a limit on the magnitude of voltage output from a circuit ...
AC Adapter - Modes of Operation
... Originally, most AC/DC adapters were linear power supplies, containing a transformer to convert the mains electricity voltage to a lower voltage, a rectifier to convert it to ... with load for equipment requiring a more stable voltage, linear voltage regulator circuitry was added ... Losses in the transformer and the linear regulator were considerable efficiency was relatively low, and significant power dissipated as heat even when not driving a load ...

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