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Question

Consider the circuit shown in the figure below.

The above silicon transistor is biased at operating point Q(7V, 1 mA) and with Vcc=12V. If the value of β=100, then the value of stability factor S(Ico) is _________

  1. 56.75

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Solution

The correct option is A 56.75


Given, VCE=7V and IC=1mA
RC=VccVCEIC=1271×103=5kΩ
now, IB=Icβ=1×103100=10μA
RB=VccVBEICRCIB=120.71×103×5×10310×106=630kΩ
S=1+β1+β[RCRC+RB]=1+1001+100[5×103(5+630)×103]=56.50

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