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If both the MOSFET’s are identical and have channel length modulation, what is the output impedance at node S?
  • a)
    R1 || ro1 || ro2
  • b)
    R1 + (ro1 || ro2)
  • c)
    R1 + (ro1 + ro2)
  • d)
    R1 || (ro1 + ro2)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If both the MOSFET’s are identical and have channel length modul...
If we perform a small signal analysis at node S, we will find that three resistors are connected from node S to ground. They are R1, and the resistances appearing between source and drain of the MOSFET’s due to channel length modulation ie ro1 and ro2. Hence, the output resistance is R1 || ro1 || ro2.
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If both the MOSFET’s are identical and have channel length modulation, what is the output impedance at node S?a)R1 || ro1 || ro2b)R1 + (ro1 || ro2)c)R1 + (ro1 + ro2)d)R1 || (ro1 + ro2)Correct answer is option 'A'. Can you explain this answer?
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