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Subject: Re: CMOS differential amplifier

Date: 12/12/00 at 11:47 PM
Posted by: cm
E-mail: tancming@yahoo.com
Message Posted:

In Reply to: Re: CMOS differential amplifier posted by Kristena Louie on 12/12/00 at 11:00 PM:

The gain of the differential amplifier is given by the slope of the transfer characteristics between inp(+) and inp(-) terminals of the differnetial amp. The transconducance gain(voltage to current gain) is given by
Gm=sqrt(2*beta*Ibias)/4=gm/4
where Ibias is the bias current of the differential amp.
Increasing Ibias increases the gain of the differential amp.
The transconductance gm can also be increased by increasing the width of the differential amp.

The SR is affected by the bias current of the differential amp, i.e. dV/dt=ibias/C

will let you know the title of a suitable book later.


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