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If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if only M1 has channel length modulation?
  • a)
    R / ((1/g || r) + R) * g *R * R / (1/g + R)
  • b)
    R / ((1/g || r) + R) * g *R * R * g
  • c)
    R / ((1/g || r)) * g *R * R / (1/g + R)
  • d)
    R / ((1/g) + R) * g *R * R / (1/g + R)
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If g is the transconductance and r is the resistance due to channel le...
This is a cascade of a follower stage follower by a CS stage which precedes another follower stage. The gain due to each stage gets multiplied until we reach the output. For the first stage, the gain is R/ ((1/g || r)+ R) since M1 has channel length modulation. The second stage has a gain of g * R while the final stage has a gain of R/ (1/g + R). After multiplying the gains, we get R/ ((1/g || r )+ R) * g *R * R/ (1/g + R).
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If g is the transconductance and r is the resistance due to channel length modulation – what is the total voltage gain if only M1 has channel length modulation?a)R / ((1/g || r) + R) * g *R * R / (1/g + R)b)R / ((1/g || r) + R) * g *R * R * gc)R / ((1/g || r)) * g *R * R / (1/g + R)d)R / ((1/g) + R) * g *R * R / (1/g + R)Correct answer is option 'A'. Can you explain this answer?
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