Hardware & Software System

A transistor amplifier must satisfy three basic conditions, namely :   1) proper zero signal collector current.   2) proper base-emitter voltage at any instant and   3) proper collector-emitter voltage at any instant. It is the fulfilment of these conditions which is known as transistor biasing.          The proper flow of zero signal collector current and the maintenance of proper collector-emitter voltage during the passage of signal is known as transistor biasing.

The basic function of transistor is to do amplification.The weak signal is given to the base 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 is 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 of the transistor remains forward biased and output circuit always remains reverse biased during all parts of the signal. This is known as transistor biasing.