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Physical electronics devices and ics miscellaneous

Physical Electronics Devices and ICs

  1. 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—


    1. 4.6 V and 1.98 mA
    2. 3.18 V and 2.5 mA
    3. 5.4 V and 1.56 mA
    4. 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 =
9.43
2.7 × 103 + { (200 + 2.7) 103 / 990}

or IC =
9.43
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.



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