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VCEQ, ICQ, and IBQ are dc Q-point values with no input sinusoidal voltage applied.

Point B corresponds to the negative peak, and point Q corresponds to the zero value of the sine wave. Point A on the load line corresponds to the positive peak of the sinusoidal input voltage. As a result, the collector-to-emitter voltage varies 2.2 V above and below its Q-point value of 3.4 V. This causes the collector current (IC) to vary 10 mA above and below its Q- point value of 30 mA. The DC Operation Point Assume a sinusoidal voltage, Vin, is superimposed on VBB, causing the base current to vary sinusoidally 100 mA above and below its Q-point value of 300 mA. The DC Operation Point Figure 2 Variations in collector current and collector-to-emitter voltage as a result of a variation in base current. Fixed Bias with Emitter Resistor Potential Divider Bias Circuit.Fixed Bias Circuit emitter-feedback bias circuit.The circuit used for transistor biasing is called the biasing circuit. The later method is more efficient and is frequently used. The DC Operation Point HOW A TRANSISTOR CAN BE BIASED? A transistor is biased either with the help of battery or associating a circuit with the transistor. The DC Operation Point Figure 1 Examples of linear and nonlinear operation of an inverting amplifier (the triangle symbol). In this chapter, several types of bias circuits are discussed.