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Design >> Mixed-Signal Design >> error correction circuit for 1.5bit/stage pipeline
https://designers-guide.org/forum/YaBB.pl?num=1117170602

Message started by ericjohnson on May 26^th, 2005, 10:10pm

Title: error correction circuit for 1.5bit/stage pipeline
Post by ericjohnson on May 26^th, 2005, 10:10pm

Can someone please provide some good reference on how to design error correction circuit for 1.5b/stage pipelined ADC? If detailed circuit topology/schematic can be provided, that'll be greatly appreciated!

Title: Re: error correction circuit for 1.5bit/stage pipe
Post by ywguo on May 30^th, 2005, 10:56pm

Ericjohnson,

The earliest paper presented the 1.5bit/stage algorithm (RSD) is by B. Ginetti, P. Jespers, "A 1.5 Ms/s 8-bit Pipelined RSD A/D Converter," in European Solid-State Circuits Conference Digest of Technical Papers, pp. 137-140, Sep. 1990. But I havn't that paper since only ESSCIRC papers after 1996 are availabe on its website. But I have another paper by G. Ginetti, et al., A CMOS 13-b cyclic RSD A/D converter, JSSC, July, 1992. I hope it will be helpful for you.

Best regards,
Yawei

Title: Re: error correction circuit for 1.5bit/stage pipe
Post by ericjohnson on May 31^st, 2005, 8:12am

Thank you , Yawei. I will read the paper.

Title: Re: error correction circuit for 1.5bit/stage pipe
Post by Paul on Jun 1^st, 2005, 12:52pm

Eric

you can also try to find Jesper's book. I find it well written, but sometimes too concise on the details:
http://www.oup.co.uk/isbn/0-19-856446-5

Anyway this scheme has been used by many people, so you should be able to find many papers on it. It seems to me it's just about addition of output codes, but make sure to use the right format and offset. There's also the following Maxim appnote:
http://maximic.com/appnotes.cfm/appnote_number/1023
although, I dislike some statements like "The implication is that none of the flash ADCs in Figure 1 has to be as accurate as the entire ADC." This may be true for the gain error, but the non-linearity of any stage directly affects the overall non-linearity directly. So be careful...

Paul

Title: Re: error correction circuit for 1.5bit/stage pipe
Post by ericjohnson on Jun 4^th, 2005, 11:24am

Thank you, Paul. If I understand correctly, the digital error correction part is just a simple adder, right?

Title: Re: error correction circuit for 1.5bit/stage pipe
Post by ywguo on Jun 6^th, 2005, 9:51pm

Ericjohnson,

You are right.

Yawei