Analog to digital converters

On Thu, 09 Mar 2017 14:57:56 +0100, David Brown
<david.brown@hesbynett.no> wrote:

>On 09/03/17 14:46, Rick C. Hodgin wrote:
>> On Thursday, March 9, 2017 at 5:59:27 AM UTC-5, David Wade wrote:
>>> On 09/03/2017 09:46, Rick C. Hodgin wrote:
>>>> Are analog to digital converters fundamentally, in their core inner
>>>> design, basically tiny systems which operate like 555 timers, with a
>>>> series of resistors and capacitors designed to sample ranges, essentially
>>>> counting ticks per fixed units of time, resulting in the digital data
>>>> necessary to perform an indexed lookup from the inner sampler
>>>> that's in range, to produce an output bit patfern?  With then
>>>> some tail logic to prevent jitter beyond an expected operating
>>>> range / frequency?
>>>
>>> There are several designs. Why not start with the obvious place...
>>>
>>> https://en.wikipedia.org/wiki/Analog-to-digital_converter
>>>
>>> for an over view of the varios techniques..
>> 
>> I was able to look at it on my desktop computer.  Thank you for the
>> assistance. :-)
>> 
>
>You can see there are many methods - none of which fits very well with
>the description you wrote, as far as I can see.
>
>Successive approximation ADC's are the most common for general purpose
>ADCs.  Flash (direct conversion) ADC's are used for very high speed, and
>Sigma-Delta is the usual method for high resolution (such as audio ADC's).
>
>

Pure flash ADCs are rare these days; they need too many power-hungry
comparators. Most fast ADCs are pipeline architectures with radical
levels of digital calibrations.


-- 

John Larkin         Highland Technology, Inc

lunatic fringe electronics