Multiple choice

In the circuit shown below, assume that the voltage drop across a forward biased diode is 0.7 V. The thermal voltage Vt = kT / q = 25mV. The small signal input vi = Vp cos $\omega t$ where Vp = 100 mV.

The bias current IDC through the diodes is

  1. 1 mA

  2. 1.28 mA

  3. 1.5 mA

  4. 2 mA
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A Correct answer
Explanation

The current flows in the circuit if all the diodes are forward biased. In forward biased there will be 0.7 drop across each diode. Thus $ I_{DC} = \dfrac{12.7-4(0.7)}{9900} = 1\ mA$

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