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cmos amp design: input is close to ground
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freewing



Joined: 16 Mar 2005
Posts: 36
Post29 Oct 2009 16:29   

cmos amp design: input is close to ground
The input is close to ground, what type of CMOS amp or comparator can handle this?
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dick_freebird



Joined: 04 Mar 2008
Posts: 309
Helped: 45
Location: USA
Post29 Oct 2009 18:54   

cmos amp design: input is close to ground
You are looking for either "rail to rail input" or "input common
mode range includes ground" input features. Anything
from the venerable LM339 to CMOS R-R op amps can do
it, but not all are set up that way.

Searching for things like

rail input "op amp" schematic

or

input common mode ground "op amp" schematic

ought to turn you up plenty of viable hits to study.
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Post29 Oct 2009 18:54   

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jesseyu1984918



Joined: 16 Jun 2008
Posts: 13
Helped: 1
Location: Singapore
Post02 Nov 2009 10:10   

cmos amp design: input is close to ground
I think you could use PMOS input differential pair and using very small W/L ratio.
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