Transistor Biasing

The basic function of transistor is to do amplifica-tion.  The weak signal is given to the base of the transistor and amplified output is obtained in the collector circuit.  One important requirement during amplification is that only the magnitude of the signal should increase and there should be no change in signal shape.  This increase in magnitude of the signal without any change in shape is known as faithful amplification. In order to achieve this, means are provided to ensure that input circuit (i.e. base-emitter junction) of the transistor remains forward biased and output circuit (i.e. collector-base junction) always remains reverse biased during all parts of the signal.  This is known as transistor biasing.  In this chapter, we shall discuss how transistor biasing helps in achieving faithful amplification.