Bias point
From Wikipedia, the free encyclopedia
In electronics, a bias point, also known a quiescent point or a operating point, is a dc voltage which, when 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.
[edit] Sources
- Sedra, Adel; Smith, Kenneth (2004). Microelectronic Circuits. Oxford University Press. ISBN 0-19-514251-9.
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