![]() 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.and voltages called the dc operating point or quiescent point (Q-point).DC biasing is used to establish fixed dc values for the transistor currents.a transistor must be properly biased in order to operate as an amplifier. ![]() Salahaddin University Engineering College Electrical Engineering Depatrment 2018-2019 Transistor Bias Circuits Asst. ![]()
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