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If channel length modulation is present, what is the impedance looking into node X?
  • a)
    (1/gm2 || ro2 || 1/gm1)
  • b)
    (1/gm2 || 1/gm1 || ro1)
  • c)
    (1/gm2 || ro2 || 12/gm1 || ro1)
  • d)
    (1/gm2 || ro2 || 1/gm1 || ro1)
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
If channel length modulation is present, what is the impedance looking...
The source of M1 and M2 are connected at node X. The impedance looking into the source of a MOSFET is (1/gm || ro). If we look at node X, M1 and M2 are connected from Node X to ground. Hence, they are parallel to each other and the overall impedance becomes (1/gm2 || ro2 || 1/gm1 || ro1).
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If channel length modulation is present, what is the impedance looking into node X?a)(1/gm2 || ro2 || 1/gm1)b)(1/gm2 || 1/gm1 || ro1)c)(1/gm2 || ro2 || 12/gm1 || ro1)d)(1/gm2 || ro2 || 1/gm1 || ro1)Correct answer is option 'D'. Can you explain this answer?
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