Q.Explain biasing of a transistor.

Biasing prepares a transistor for use by fixing its DC operating conditions.

[!ANSWER]

Biasing is the application of a suitable DC voltage of correct polarity and magnitude across the transistor terminals so that it operates in the desired region; the biasing circuit fixes the base current, collector current, $V_{CE}$ and $V_{BE}$.

[!TLDR]

Biasing applies DC voltages that set the transistor's operating point in the region needed for its application.

A transistor must be supplied with steady DC voltages before it can handle a signal. Biasing is the process of applying a DC voltage of correct polarity and magnitude across the transistor terminals so that it works in the desired region - the active region for amplification, or the saturation and cutoff regions for switching. The biasing circuit establishes the base current, collector current, collector-to-emitter voltage and base-to-emitter voltage. Good biasing must keep the operating point at the centre of the active region (so it does not drift into saturation or cutoff), keep the collector current stable against temperature changes, and keep the operating point fixed when the transistor is replaced by another of the same type.

[!ANSWER]

Biasing is the application of a suitable DC voltage of correct polarity and magnitude to the transistor terminals to place its operating point in the desired region, fixing its base current, collector current, $V_{CE}$ and $V_{BE}$.