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The operating point of the transistor is the point of DC bias that allows full AC swing, thereby maximizing stage amplification
operating pint means the v,i values that make the transistor operate in its linear region.
In electronics, a bias point, also known a quiescent point or a operating point, is a dc voltage which, applied to a device, causes it to operate in a certain desired fashion. The term is normally used in connection with devices such as transistors and diodes which are used in amplification or rectification.
For example, for Bipolar Junction Transistors the bias point would keep the transistor operating in the active mode, drawing a dc current. A small signal is then applied on top of this bias voltage, thereby either modulating or switching the current, depending on the design of the circuit. The input dc voltage is chosen to satisfy the required large signal parameters.
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Sources
* Sedra, Adel; Smith, Kenneth (2004). Microelectonic Circuits. Oxford University Press. ISBN 0-19-514251-9.