In the circuit shown below , transistor M1 is in saturation and has transconductance gm=0.01S . Ignoring internal parasitic capacitances and assuming the channel length modulation λ to be zero, then the small signal input pole frequency (in kHz) is
A
None
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B
87.57 kHz
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C
57.87 kHz
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D
75.78 kHz
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Solution
The correct option is C 57.87 kHz With respect to AC
Taking Miller's equivalent and assume r0=∞
AV=−gmRD=−0.01×103
Small signal input pole frequency,
f=12πRC
where C is the input capacitance after taking miller circuit