Let us have a look at the factors that affect the stabilization of operating point. The below figure shows a transistor amplifier that is provided with DC biasing on both input and output circuits.įor a transistor to be operated as a faithful amplifier, the operating point should be stabilized. The given DC voltage and currents are so chosen that the transistor remains in active region for entire input AC cycle. If appropriate DC voltages and currents are given through BJT by external sources, so that BJT operates in active region and superimpose the AC signals to be amplified, then this problem can be avoided. The BJT should be in the active region, to be operated as an amplifier. The input voltage should exceed cut-in voltage for the transistor to be ON. Because, for a BJT, to amplify a signal, two conditions have to be met. If a signal of very small voltage is given to the input of BJT, it cannot be amplified. The circuit which provides transistor biasing is called as Biasing Circuit. The proper flow of zero signal collector current and the maintenance of proper collectoremitter voltage during the passage of signal is known as Transistor Biasing. In the previous chapter, we explained how a transistor acts as a good amplifier, if both the input and output sections are biased. A transistor is based in order to make the emitter base junction forward biased and collector base junction reverse biased, so that it maintains in active region, to work as an amplifier. Emitter Follower & Darlington Amplifierīiasing is the process of providing DC voltage which helps in the functioning of the circuit.Transformer Coupled Class A Power Amplifier.
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