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From: Mirek on 9 Oct 2009 13:10
On pi�, 09 pa� 2009 19:03:06 in article news:<m3bpkgwldh.fsf(a)ieee.org>
Randy Yates wrote:
>>> Very, very good tutorial is here:
>>> http://www.lr.ttu.ee/irm/sideseadmete_mudeldamine/AD_MT_Tutorial.pdf
>>>
>>
>> I don't know who Walt Kester is, but I'm a fan!
>>
>> That's an excellent reference for all things having to do with ADC/DAC
>> technology and issues.
>
> It *is* a very nice reference. He looks like he was (or is) an Analog
> Devices engineer - probably the type that writes their application notes. I
> guess these *are* application notes?


Newer versions here: D/A Converters - Tutorials
http://www.analog.com/en/training-and-tutorials/tutorials/design-center/products/digital-to-analog-converters/da-converters/resources/index.html
From: Alexander Sotnikov on 9 Oct 2009 14:26
>
>I don't know who Walt Kester is, but I'm a fan!
>
>That's an excellent reference for all things having to do with ADC/DAC
>technology and issues.
>
>--
>Eric Jacobsen
>Minister of Algorithms
>Abineau Communications
>http://www.abineau.com
>

Walt has been working at ADI for many years. He is the editor of Data
Conversion Handbook and these tutorials are just the excerpts from there.
You can find the whole book here:
http://www.analog.com/library/analogDialogue/archives/39-06/analog_digital_conversion.zip

--Alexander



From: m26k9 on 10 Oct 2009 10:56
Thank you very much for that text... it is indeed really good... many
concepts described nicely...
From: Rick Lyons on 22 Oct 2009 11:58
On Fri, 09 Oct 2009 13:03:06 -0400, Randy Yates <yates(a)ieee.org>
wrote:

>Eric Jacobsen <eric.jacobsen(a)ieee.org> writes:
>
>> On 10/9/2009 1:07 AM, Mikolaj wrote:
>>> On 09-10-2009 at 08:33:39 m26k9 <maduranga.liyanage(a)gmail.com> wrote:
>>>
>>>> Hello,
>>>>
>>>> I am looking for some facts or specifications about an ADC quantizer.
>>>> Firstly I want to know if it possible for quantizers to dynamically
>>>> change
>>>> their resolution? or is it fixed for a quantizer.
>>>
>>> My first thought was oversampling,
>>> shortly it is changing resolution within increasing sampling rate
>>> (and there is a strict formula on that)
>>>
>>> Very, very good tutorial is here:
>>> http://www.lr.ttu.ee/irm/sideseadmete_mudeldamine/AD_MT_Tutorial.pdf
>>>
>>
>> I don't know who Walt Kester is, but I'm a fan!
>>
>> That's an excellent reference for all things having to do with ADC/DAC
>> technology and issues.
>
>It *is* a very nice reference. He looks like he was (or is) an Analog
>Devices engineer - probably the type that writes their application notes. I
>guess these *are* application notes?

Hi Randy,
you're right.

Some years ago I called Walt Kester to warn him
of a rogue Interent site that illegally posted a copy
of one of Walt's books. He is a nice guy.

m26k9 might want to have a look at:

http://www.analog.com/processors/learning/training/design_techniques.html

See Ya',
[-Rick-]
From: rickman on 23 Oct 2009 14:33
On Oct 9, 2:33 am, "m26k9" <maduranga.liyan...(a)gmail.com> wrote:
> Hello,
>
> I am looking for some facts or specifications about an ADC quantizer.
> Firstly I want to know if it possible for quantizers to dynamically change
> their resolution? or is it fixed for a quantizer.
>
> If the quantizer can actually change its resolution, I would be very
> grateful if somebody could direct me to a site or a article about this
> mechanism. Specifically;
> 1) The connection between resolution and sampling rate
> 2) Resolution and power consumption.
>
> Any wisdom or reference is greatly appreciated.
> Thank you.

I haven't had a chance to read any of the references posted here, so
this may have been described, but one easy way to change the
resolution of an ADC is to use a successive approximation type
converter and only digitize as many bits as you need. The converter
has to be designed to handle the max number of bits you require. You
improve both speed and power by converting fewer bits. Of course this
is not as fast or power efficient as a converter designed for fewer
bit since the comparison operation can go faster and use a lower power
comparator if you design it for less resolution.

Rick
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