[time-nuts] Wavecrest noise measurement hardware

[Magnus Danielson]

From: "John Miles" <jmiles at pop.net>
Subject: [time-nuts] Wavecrest noise measurement hardware
Date: Wed, 25 Apr 2007 11:43:30 -0700
Message-ID: <PKEGJHPHLLBACEOICCBJCEDHNMAA.jmiles at pop.net>

> As an aside, how do the Wavecrest machines work?  Do they just run the
> signal into a low-jitter ADC with a high-quality clock and derive all the
> timing information digitally, or is the box full of low-noise tunable
> synthesizers, mixers, filters, and the usual stuff?

It is a fairly traditional design in which they have a coarse clock (100 MHz
for the DTS-207X and 200 MHz for the SIA-3000), generate an error signal which
charge a capacitor and then A/D convert the accumulated voltage into digital.

They have a patent from the DTS-207X days which should give you more than
enought feeling of how it works. ;)

Cheers,
Magnus