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bl965
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Homework Statement
A bypass capacitor increases gain in the mid-band region. Explain how with the figure and small signal model. Assume gm=0.5mS.
Homework Equations
Rs = 1 k Ohm
The Attempt at a Solution
With the bypass capacitor, the source would be treated as grounded and the equations to find gain would be:
Vo= -gm x Vgs x Rd
Vgs= Vsig x R1||R2 / (R1||R2 + Rsig)
How does the source resistor effect the circuit? Vgs will be different because Vs will no longer be 0. Vs will be gm x Vgs x Rs.
Thank you.
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