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In the circuit shown VCC = 10, RC = 2.7 K, RF = 200 K, β = 99, VBE = 0.6V. The operating point VCE, IC are given by—
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- 4.6 V and 1.98 mA
- 3.18 V and 2.5 mA
- 5.4 V and 1.56 mA
- 4.2 V and 2.1 mA
Correct Option: A
From given figure
VCC – Ie RC – Ib Rf – VBE = 0
VCC – IC RC – Ib (Rf + Rc) – VBE = 0
VCC – IC RC – IC β (Rf + RC) – VBE = 0
10 – IC | RC + | (Rf + RC) | – 0.6 = 0 | ||
β |
or IC = | 2.7 × 103 + { (200 + 2.7) 103 / 990} |
or IC = | 2700 + 2047.47 |
or IC = 1.98 mA
or VCE = VCC – IC RC = VCC – (IC + Ib) RC
or VCE = 10 – | 1.98 + | 1.98 | × 10–3 × 2.7 × 103 | ||
99 |
or VCE = 10 – 5.4 = 4.6 V
Hence alternative (A) is the correct answer.