If channel length modulation is present. what is the overall output impedance of the following CG stage?

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answerhappygod
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If channel length modulation is present. what is the overall output impedance of the following CG stage?

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a) Rd || {Rs*(1+gm * ro) + ro}
b) Rd || {Rs*(1+gm * ro) + 2ro}
c) Rd || {Rs*(1+gm * ro) – ro}
d) Rd || {Rs*(2+gm * ro) + ro}
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