One possible relatively simple module could use an ACAM TDC-GP2 to
compare the relative stability of a pair of low noise oscillators.
Performance comparable to a 5370A/B at a fraction of the power, weight
should be achievable in this application.
One of the oscillators would be divided down to at least 1KHz and used
to drive the start input whilst the undivided oscillator output drives
the 1st stop channel and the other oscillator drives the 2nd stop channel.
The divider output jitter need not be state of the art as its only used
to arm the device.
However its clock to output delay should be somewhat less than 1 period
of the input frequency.
The ACAM TDC-GP2 uses an SPI interface.
In principle one can process all 4 hits in each of the 2 stop channels
to reduce the noise.
The usable oscillator frequency range is around 200KHz to 50MHz.
Bruce
David C. Partridge wrote:
If your spend is in that sort of region it doesn't cost a great deal more to
get a batch of boards professionally pasted, picked, placed and reflowed.
Regards,
David Partridge
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Bob Camp
Sent: 16 December 2010 19:20
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Frequency counter recommendation
Hi
Yes indeed, been there done that. Not very hard at all.
All you need is the six layer pc board (can be bought), the FPGA (Digikey has
them), a few of these and a couple of those. Spend less than $100 and you are
in business if the PC board volume is high enough.
In this case the next step in the business is to solder the 256 ball 1 mm
spacing BGA package down on the pc board. Not so easy without the right tools...
Bob
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
