A low noise sample and hold is still required.
Bruce
Bob Camp wrote:
Hi
Does the synchronous filter on the PWM still have a sample and hold in it, or
has somebody come up with a different approach?
Bob
On Dec 5, 2012, at 3:06 AM, Bruce Griffiths<bruce.griffi...@xtra.co.nz> wrote:
Hal Murray wrote:
albertson.ch...@gmail.com said:
What is the simplest phase detecter that could work? I think only that, and
then a duouble oven crystal from eBay, a GPS and and Arduido.
You also need a good D2A to drive the EFC on the osc.
A synchronous filter of a suitably level translated (CMOS analog switch plus
low noise reference) PWM output should work well.
Yes the Aruino is expensive compared to a bare uP chip but using one, I thin
you could build a GPSDO without a PCB and the Arduino's USB connection could
be usful for power and logging/control.
I wouldn't want to power a GPSDO from USB. It will get power cycled every
time I need to work on the logging PC. Besides, you only get 2.5 watts. The
oven will probably take more than that during warm-up.
Bruce
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