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icfb
Joined: 10 Jun 2004
Posts: 26
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 02 Aug 2004 8:12 about offset cancelling in comparator |
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how to implement offset cancellling in comparator or AMP?
Anybody have some good circuits?
thanks!
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rauol
Joined: 02 Oct 2002
Posts: 364
Helped: 11
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| 02 Aug 2004 9:12 Re: about offset cancelling in comparator |
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 you can trim the offset using a potentiometer from the ofset pin.
which op amp are u using
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papyaki
Joined: 13 Apr 2002
Posts: 564
Helped: 19
Location: A small village somewhere in Gaul
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| 02 Aug 2004 9:35 Re: about offset cancelling in comparator |
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Hi,
See this app note from maxim : h**p://www.maxim-ic.com/appnotes.cfm/appnote_number/803
* = t
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sunking
Joined: 25 May 2004
Posts: 914
Helped: 46
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| 03 Aug 2004 2:33 Re: about offset cancelling in comparator |
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| You can use chopped method to cancel the offset
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piao
Joined: 12 Feb 2003
Posts: 223
Helped: 7
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| 04 Aug 2004 6:39 about offset cancelling in comparator |
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| you can refer to Razavi's principle of Data conversion. there are something about offset cancellation.
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icfb
Joined: 10 Jun 2004
Posts: 26
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| 06 Aug 2004 1:40 Re: about offset cancelling in comparator |
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hi sunking,
how to use chopped method ? Please tell me.
thank you
| sunking wrote: |
| You can use chopped method to cancel the offset |
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icfb
Joined: 10 Jun 2004
Posts: 26
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| 06 Aug 2004 2:07 Re: about offset cancelling in comparator |
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hi piao,
could you offer me the file?
thank you
| piao wrote: |
| you can refer to Razavi's principle of Data conversion. there are something about offset cancellation. |
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sunking
Joined: 25 May 2004
Posts: 914
Helped: 46
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| 06 Aug 2004 4:14 Re: about offset cancelling in comparator |
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| http://www.edaboard.com/viewtopic.php?t=81220&highlight=cmos+analog+circuit+design
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colonel
Joined: 28 Aug 2003
Posts: 30
Helped: 1
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| 25 Nov 2004 10:01 Re: about offset cancelling in comparator |
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| piao wrote: |
| you can refer to Razavi's principle of Data conversion. there are something about offset cancellation. |
can I find this book on this site ? thanks 
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leo_o2
Joined: 03 Sep 2004
Posts: 330
Helped: 20
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| 29 Nov 2004 10:40 Re: about offset cancelling in comparator |
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| You can design a circuit to increase or decrease output current at the output stage of comparator step by step till the offset is cancelled. Then the circuit burned some trimming cell bits to record the result.
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Markie
Joined: 16 Nov 2004
Posts: 29
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| 02 Dec 2004 6:47 Re: about offset cancelling in comparator |
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hi, I have know a good network that "h**p://www.edacafe.com"
then you can seach for chopper,
a PHD thesis will give you a lot of knowledge about it.
Or IEEE will help you.
I am also interested with chopper. ^$^
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zmliu
Joined: 21 Mar 2004
Posts: 92
Helped: 4
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| 02 Dec 2004 8:05 Re: about offset cancelling in comparator |
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| you can downlaod this book by Razavi on EBOOK section in this EDAboard.
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yyliang
Joined: 26 Aug 2004
Posts: 43
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| 08 Dec 2004 7:18 Re: about offset cancelling in comparator |
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| to use a chopper amp or view the page 464 of CMOS Analog Circuit Design by P.E.Allen and Holberg.
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okawa
Joined: 23 Nov 2004
Posts: 23
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| 08 Dec 2004 11:13 about offset cancelling in comparator |
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| chopping or SC are very wide used methods in offset cancellation ,and both of the two metods are dynamic .Is there any other method in offset cancellation? Now i am trying an offset cancellation method without capacitor. I tried several methods but they were very unstable.
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cetc1525
Joined: 08 Oct 2004
Posts: 177
Helped: 3
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| 08 Dec 2004 11:29 about offset cancelling in comparator |
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| can you put a picture on this site?
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jyq_analog
Joined: 10 Dec 2003
Posts: 17
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| 12 Dec 2004 14:03 about offset cancelling in comparator |
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Autozeroing techniques about comparator
CDS,CHS about Opamp
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