[time-nuts] Linear Interpolator

Magnus Danielson cfmd at bredband.net
Thu Jun 29 09:55:39 UTC 2006


From: "Stephan Sandenbergh" <stephan at rrsg.ee.uct.ac.za>
Subject: Re: [time-nuts] Linear Interpolator
Date: Thu, 29 Jun 2006 11:42:16 +0200
Message-ID: <000901c69b60$4eea6e30$401c9e89 at Stephan>

> Magnus,

Stephan,

> Regarding your suggested discrete solution (viz. current mirror, ADC, etc):
> Will it be relatively easy to achieve 1ns resolution and a range of say
> 100ns (for 10MHz) with sub-nanosecond accuracy? 

Well, go and look in the HP5335A service manual and decide for yourself.
Naturally, there is the issue about input/trigger design, but that is a common
problem.

I would not do this stuff with a clock lower than 50 MHz today. It is easy
enought to acomplish it. 10 MHz is nice and dandy for reference, but I would
use a low-jitter VCXO and lock it to the 10 MHz and then use that clock for
measurements.

Cheers,
Magnus




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