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GATE ECE 2011 | Question-54

Statement for Linked Answer Questions 54 and 55 :

In the circuit shown below, assume that the voltage drop across a forward biased diode is $0.7 \mathrm{~V}$. The thermal voltage $\mathrm{V}_{\mathrm{t}}=\mathrm{kT} / \mathrm{q}=25 \mathrm{mV}$. The small signal input $\mathrm{v}_{\mathrm{i}}=\mathrm{V}_{\mathrm{P}} \cos (\omega \mathrm{t})$ where $\mathrm{V}_{\mathrm{p}}=100 \; \mathrm{mV}$.

The bias current $\mathrm{I}_{\mathrm{DC}}$ through the diodes is

  1. $1 \mathrm{~mA}$
  2. $1.28 \mathrm{~mA}$
  3. $1.5 \mathrm{~mA}$
  4. $2 \mathrm{~mA}$
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