Multiple choice

A bipolar transistor is operating in the active region with a collector current of 1 mA. Assuming that the $\beta$ of the transistor is 100 and the thermal voltage (VT) is 25 mV, the transconductance (gm) and the input resistance ($r_x$)the transistor in the common emitter configuration, are

  1. gm = 25 mA/V and $r_x$= 15.625 k$\Omega$
  2. gm = 40 mA/V and $r_x$= 4.0 k$\Omega$
  3. gm = 25 mA/V and $r_x$= 2.5 k$\Omega$
  4. gm = 40 mA/V and $r_x$= 2.5 k$\Omega$
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D Correct answer
Explanation

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