Question
Download Solution PDFFind the input capacitance for a common source(CS) MOSFET amplifier, when Cgs = 5pF, Cgd = 3pF, and Av = 3.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The small signal model of a common source MOSFET amplifier is:
The input capacitance for a common source(CS) MOSFET amplifier is given by:
\(C_{in}=C_{gs}+(1+A_V)C_{gd}\)
where, Cgs = Gate to source capacitance
Cgd = Gate to drain capacitance
AV = Voltage gain
Calculation
Given, Cgs = 5 pF
Cgd = 3 pF
AV = 3
\(C_{in}=5+(1+3)3\)
Cin = 17 pF
Last updated on Jun 16, 2025
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