[time-nuts] HP5370B & HP5345B Front-End IC Redesign Effort

paul swed paulswedb at gmail.com
Sat Jan 23 19:47:34 EST 2016


I have 5370s and 5345 working and then those that aren't so interested. I
did play with some ecl chips but they worked poorly. Can't do any clever
math or dispersion...
But good with a soldering iron.
Regards
Paul
WB8TSL

On Sat, Jan 23, 2016 at 1:23 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz
> wrote:

> Mat
>
> I can help out with a few design ideas and check your calculations.I only
> have a 5370A so I probably cant help with dispersion measurements.
>
> I'm tempted to replace the power hungry 5370A with something with a power
> consumption of under 10W and noise (jitter) at least 5x smaller.
>
> Bruce
>
>     On Saturday, 23 January 2016 3:12 PM, Mathew Breton <ab8vj at outlook.com>
> wrote:
>
>
>  I was gifted an HP 5370B with the usual problem: front-end problems,
> probably due to overstress. It is currently up and running again with a set
> of 5345A series A3/A4 boards as I wasn't able to get a cheap pair of
> 5088-706x hybrid ICs.
> This sounds like a common problem. As a result, I'm designing an
> open-source drop-in (hopefully) replacement. My hat is off to the original
> IC designer, as it is not a trivial effort due to the wide input signal
> common-mode range, and very tight trigger timing requirements. Other items
> (like the E-ECL) output) are also adding a bit of extra effort.
> I'm hoping that someone(s) might be interested in working with me on it. I
> would like to have my assumptions and math checked before I start the
> detailed design phase, and perhaps contribute some better ideas.
> In addition, it would be really helpful if someone could run a few
> rise-time dispersion tests on an instrument with a working "B"-series A3/A4
> PCB set (my unit obviously doesn't qualify).
> Regards,
> Mat Breton
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