When a split supply (dual power supply) is available, this biasing circuit is the most effective, and provides zero bias voltage at the emitter or collector for load. The negative supply V is used to forward-bias the emitter junction through R. The positive supply V is used to reverse-bias the collector junction. Only two resistors are necessary for the common collector stage and four resistors for the common emitter or common base stage.

We know that,

V − V = V

If R is small enough, base voltage will be approximately zero. Therefore, emitter current is,

Ie = (V − V)/R

The operating point is independent of β if Re » R/β

Advantages:

Disadvantages:

This type can only be used when a split (dual) power supply is available.

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