[time-nuts] Fast frequency counting question
bruce.griffiths at xtra.co.nz
Sun May 4 17:30:17 EDT 2008
Murray Greenman wrote:
> Thanks for your reply. Yes, I believe Leon has 30dB gain post mixer. He
> is using an FSS 1000E as his mixer. So, we don't think the problem is
> slew-rate limiting. Your suggestions for checking the performance with
> changes in level is a good one.
> This is an area of counting I've not considered before. We are working
> with the chip manufacturers, and they report the problem, which we would
> like to replicate. Personally I can't see it as an issue, but it has
> been raised, and we would like to understand how to measure it. The chip
> manufacturer has a high-speed A-D system and some method (unknown to us)
> for post-processing the data.
> I've suggested that Leon reply to you directly, as he has a better grip
> on what the problem and requirement is. I understand that the problem is
> relayed to warm-start TTFF performance in a GPS application.
> Murray Greenman
Just adding a post mixer amplifier of unspecified bandwidth isnt the
optimum way of amplifying the slope of a signal.
Using a cascade of stages with the gain and bandwidth increasing for
each successive stage will produce an amplified signal with less jitter
than just using a single gain stage.
More information about the time-nuts