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

Mathew Breton ab8vj at outlook.com
Fri Jan 22 22:14:36 UTC 2016

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).
Mat Breton 		 	   		  

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