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GATE ECE 1996 | Question-28

A Darlington stage is shown in the figure is. If the transconductance of $Q_{1}$ is $g_{m 1}$ and $Q_{2}$ is $g_{m 12}$, then the overall transconductance $g_{m c}\left[\triangleq \frac{i_{c}^{c}}{v_{b c}^{c}}\right]$ is given by

  1. $g_{m 1}$
  2. $0.5 g_{\text {m } 11}$
  3. $g_{m 2}$
  4. $0.5 g_{m 2}$

     

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