- The Q-point of a transistor amplifier is the dc operating point that established the limits for linear operation. The Q-point is specified by the dc collector current and the dc collector-to-emitter voltage (in the case of a BJT).
- Distortion of the output waveform such as clipping of the peaks means that the amplifier is not operating entirely in the linear region.
- By proper selection of the bias resistors, voltage-divider bias can be independent of the transistor
and provide good Q-point stability with a single supply voltage.
- Base bias is very dependent on , resulting in poor Q-point stability, and is not a good choice.
- Emitter bias can provide good Q-point stability but requires two supply voltages.
- Collector-feedback bias can provide reasonably good Q-point stability.
