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Explain behaviour of $g_m$ as a function of below parameters: i) Overdrive voltage with W/L constant. ii) Overdrive voltage with ID constant.

Subject: CMOS VLSI Design

Topic: CMOS analog building blocks

Difficulty: Difficult

cvd • 792  views
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MOSFET operating in saturation region produces a current in response to its gate to source overdrive voltage. So we define a parameter which gives this variation. This parameter is called transconductance (gm).

This is the behavior of gm as a function of overdrive voltage with W/L constant. Gm can also be expressed as,

This is the behavior of gm as a function of overdrive voltage with ID constant.