Requirements of a biasing circuit
· Emitter base junction must be forward biased and collector base junction must be reverse biased. That means the transistor should be operated in the middle of the active region or Q point should be fixed at the centre of the active region.
· Circuit design should provide a degree of temperature stability.
· Q point should be made independent of the transistor parameters such as β.
To maintain the Q point stable by keeping IC and VCE constant so that the transistor will always work in active region, the following techniques are normally used,
1. Stabilization technique
2. Compensation technique