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  • Test 1 - Analog Circuits (Electronics and Communication)
  • The current ib through the base of a silicon npn transist...
Multiple choice

The current ib through the base of a silicon npn transistor is 1 + 0.1 cos(10000 $\pi$t) mA. At 300 K, the r$\pi$ in the small signal model of the transistor is

  1. 250$\Omega$
  2. 27.5$\Omega$
  3. 25$\Omega$
  4. 22.2$\Omega$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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