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  4. The collector supply voltage is 6 V and the voltage drop across a resistor of 600 Ω . in the collector circuit is 0.6 V, in a transistor connected in common emitter mode. If the current gain is 20, the base current is

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Q. The collector supply voltage is $6 \,V$ and the voltage drop across a resistor of $ 600\,\Omega $ . in the collector circuit is $0.6 \,V$, in a transistor connected in common emitter mode. If the current gain is $20$, the base current is

KEAMKEAM 2010Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

$ {{i}_{C}}{{R}_{C}}={{V}_{C}} $
$ {{i}_{C}}=\frac{{{V}_{C}}}{{{R}_{C}}}=\frac{0.6}{600}=1\,mA $
$ \therefore $ $ \beta =\frac{{{i}_{C}}}{{{i}_{B}}} $
or $ {{i}_{B}}=\frac{{{i}_{C}}}{\beta }=\frac{1}{20}=0.05\,mA $