[time-nuts] Precision DACs
lajeunesse at mail.com
Wed Jul 27 14:55:20 EDT 2016
The concept of track & hold was well understood in 1966 and documented in the classic Philbrick Researches amplifier application book, now available at http://www.analog.com/library/analogdialogue/archives/philbrick/computing_amplifiers.html
> Sent: Wednesday, July 27, 2016 at 2:15 PM
> From: "Scott Stobbe" <scott.j.stobbe at gmail.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Subject: Re: [time-nuts] Precision DACs
> The first reference at hand I checked was the ADI Data Converter Handbook,
> 1986. Pg 60 Discusses track & hold, with a reference to the HDD-1206 as
> including track/hold on die.
> On Tue, Jul 26, 2016 at 2:46 PM, Richard (Rick) Karlquist <
> richard at karlquist.com> wrote:
> > On 7/25/2016 10:42 PM, Scott Stobbe wrote:
> >> dramatically different due to glitching on code transition. That being
> >> said, they are kept separate not to confuse sources of error.
> > FWIW:
> > The 5071A has a "home brew" DDS that was designed by the late
> > (and great) Robin Giffard. He used what he called a "blanking"
> > circuit that disconnected the DAC during the time period when it
> > is at risk for glitching on code transitions. He described it
> > in terms of some new innovation he had invented. It seemed to
> > me an "obvious" (that loaded word) idea that surely must have
> > been used before. In any event, he was clearly doing something
> > right (as usual).
> > Rick
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