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From: boB <boB@K7IQ.com>
Newsgroups: sci.electronics.design
Subject: Re: AD5791
Date: Sat, 08 Jun 2024 20:12:27 -0700
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On Fri, 07 Jun 2024 20:38:57 -0400, Steve Goldstein
<sgoldHAM@alum.mit.edu> wrote:

>On Fri, 07 Jun 2024 16:21:33 -0700, boB <boB@K7IQ.com> wrote:
>
>< snip>
>>
>>I'm not sure why ADI calls their Sigma-Delta rather than Delta-Sigma.
>>
>>Delta-Sigma is at least in the correct order for an A/D converter of
>>
><snip>
>
>They were called Delta-Sigma (using the upper-case Greek characters)
>in the original paper by Inose, Yasuda, and Murakami (IRE Trans. Space
>Electron. Telemetry, vol. 8, pp 205-209, Sep 1962) and in quite a
>number of subsequent papers.
>
>Whether they're called Sigma-Delta or Delta-Sigma seems to be almost a
>religious argument.

We were happy to be able to use real hardware in the late 1980s.
Crytal Semiconductor at first I think.

The way I look at it, the delta part is the input and then the sigma
from decimation and filtering.  They worked really well for the time.

boB