Fixed bias (base bias):

Diagram: Fixed bias (Base bias)

This type of biasing is also known as base bias. In the instance above figure, the single power source (for instance, a battery) is employed for both collector and base of transistor, even though separate batteries can as well be used.

In the given circuit,

V_cc = I_BR_B + V_be

Hence,

I_B = (V_cc - V_be)/R_B

For a specific transistor, V_be does not change significantly during use. Since V_ce is of fixed value, on selection of R_B, the base current I_B is fixed. Hence this kind is termed as fixed bias type of circuit.

As well for given circuit,

V_cc = I_CR_C + V_ce

Hence,

V_ce = V_cc - I_CR_C

The common-emitter current gain of a transistor is a significant parameter in circuit design, and is fixed on the data sheet for a particular transistor. It is represents as β on this page.

Because

I_C = βI_B

We can acquire I_C as well. In this way, operating point given as (V_ce,I_C) can be set for specific transistor.

Posted Date: 1/10/2013 7:05:43 AM | Location : United States

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