Sorry, Yogi

I wonder why krw thinks that LVDS allows you to "eliminate" coax? LVDS is essentially PECL, and offers much the same edge speeds, which means you almost always have to track the connections as terminated transmission lines.

Coax is a superior sort of transmission line (good to 18GHz with SMA connectors) and you'd only use it for logic if you needed very clean and fast edges, but opting for LVDS doesn't eliminate the need to minimise reflections.

nd

short duration pulse. It really was the domain of the test equipment engi neers, but I was directed to do this. I was told that otherwise the test e quipment guys would say it could not be done.

nal going thru the shield on a coax cap. Then an integrater and another s hield and feed thru cap to the level detection circuit. And it worked. S o gave a sketch to the test equipment department.

ipment guys had made did not work. It turned out that they had carefully s hielded the integrater , but had the load right next to the level detection circuit.

bbon cable (or something else?) to the back panel.

You could use a lower supply voltage for the coil-driving current sources. That would be easy and save a bunch of heat.

Cheers, James Arthur

and

en

er short duration pulse. It really was the domain of the test equipment en gineers, but I was directed to do this. I was told that otherwise the test equipment guys would say it could not be done.

ignal going thru the shield on a coax cap. Then an integrater and another shield and feed thru cap to the level detection circuit. And it worked. So gave a sketch to the test equipment department.

quipment guys had made did not work. It turned out that they had carefully shielded the integrater , but had the load right next to the level detecti on circuit.

tom

ribbon cable (or something else?) to the back panel.

Yup, right now they are driven from 15V! 5V should be fine. Figuring out how to do the power will be part of the redesign.

"To paraphrase Yogi Berra, electronics is 90% packaging, and the other half is thermal.", and the other, other half is the power supply.

George H.