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hello sand thanx for the answer but can u justify that maximum gain of the nmos and pmos is in the saturation region?

Asked By: absjoshi
On: Jul 19, 2004 12:05:37 PM

Comments(2)

gain = Gm * Ro Gm => Device Transconductance Ro => Output Resistance In the Ids Vs Vds curve, slope gives conductance or 1 / Ro. (Slope formula => m =y2 -y1/x2 -x1) => dIds/dVds) Therefore , slope = 1/Ro = (also equal to lambda, channel length modulation factor) In saturation region, slope is '0', therefore Ro is infinity. Thus gain is maximum. mfk

Comment By: mfk
On: Jul 24, 2004 7:34:48 PM

In mos amplifier, gain depends on the maximum change in current for a given change in input voltage. This occurs when the transistors are in saturation, as I is proportional to (vgs-vt)^2 as opposed to linear proportionality in the linear region. Hope this helps.

Comment By: sand
On: Jul 19, 2004 1:42:28 PM

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