In a self bias circuit, the stability factor \(\rm \frac{\partial I_C}{\partial V_{BE}}\), keeping I_CO and β constant is :

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In a self bias circuit, the stability factor \(\rm \frac{\partial I_C}{\partial V_{BE}}\), keeping I_CO and β constant is :

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper

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\(\rm \frac{\beta}{R_b+R_e(1+\beta)}\)
\(\rm \frac{-\beta}{R_b-R_e(1+\beta)}\)
\(\rm \frac{-\beta}{R_b+R_e(1+\beta)}\)
\(\rm \frac{\beta + 1}{R_b+R_e(1+\beta)}\)

Answer 1

In a self bias circuit, the stability factor \(\rm \frac{\partial I_C}{\partial V_{BE}}\), keeping ICO and β constant is : \(\rm \frac{\beta + 1}{R_b+R_e(1+\beta)}\)

Key PointsStability Factor:

It is understood that I_C should be kept constant in spite of variations of I_CBO or I_CO.

The extent to which a biasing circuit is successful in maintaining this is measured by the Stability factor. It is denoted by S.

By definition, the rate of change of collector current I_C with respect to the collector leakage current I_CO at constant β and I_B is called the Stability factor.

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In a self bias circuit, the stability factor \(\rm \frac{\partial I_C}{\partial V_{BE}}\), keeping I_CO and β constant is :

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