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Need help on switched CMFB

 
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prince_123



Joined: 07 Oct 2008
Posts: 17
Post07 Oct 2008 13:31   Need help on switched CMFB
I am making a residue amplifier for pipelined ADC on 65 nm node

Can any one tell me detailed working of switched CMFB
What will happen if there is an offset in the bias voltage set by the replica and actual bias voltage required?
Is there any way to ensure zero offset across all process cornets and temperatures?
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surajit



Joined: 11 Aug 2005
Posts: 25
Helped: 2
Post04 Nov 2008 10:20   Need help on switched CMFB
U can see in 1)Razavi and 2) Baker
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naalald



Joined: 02 Dec 2006
Posts: 287
Helped: 23
Post04 Nov 2008 14:52   Re: Need help on switched CMFB
Hi,
I don't tink it would be zero in all corners, but you can decrease it adequately. This paper includes a good research on CMFB:
"Analysis of Switched-Capacitor Common-Mode Feedback Circuit",
By: Ojas Choksi and L. Richard Carley,
TCAS II, 2003.
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prince_123



Joined: 07 Oct 2008
Posts: 17
Post05 Nov 2008 6:12   Re: Need help on switched CMFB
Thanks naalald

It will be really great if you can post that paper, I don't have IEEE access in my company.
Thanks once again
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naalald



Joined: 02 Dec 2006
Posts: 287
Helped: 23
Post05 Nov 2008 10:43   Re: Need help on switched CMFB
Hi,
The paper is attached. Hope it helps you!

Sorry, but you need login in to view this attachment
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prince_123



Joined: 07 Oct 2008
Posts: 17
Post05 Nov 2008 12:08   Re: Need help on switched CMFB
Its really useful
Thanks for help
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