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Design >> Analog Design >> Schottky diode based Sense Circuit...
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Message started by george on Apr 7^th, 2011, 5:02pm

Title: Schottky diode based Sense Circuit...
Post by george on Apr 7^th, 2011, 5:02pm

Hi,

I am new to circuit design dealing with high-speed signals and I need help finding a solution to what is a simple problem for most of you.

I need a high-Z voltage sense circuit for a high-speed I/O line. I have heard this can be done with a Schottky diode but I am not sure how. The point of the circuit is to probe a signal without disrupting it.

Any ideas or directions?

Thanks,
-George

Title: Re: Schottky diode based Sense Circuit...
Post by Rakesh on Apr 7^th, 2011, 7:29pm

What is the signal u r looking at like wat is the magnitude range etc

Title: Re: Schottky diode based Sense Circuit...
Post by george on Apr 8^th, 2011, 9:33am

It is for a pass-through/break-out board for Display Port. The peak to peak of the signal shouldn't be more than 1V. However, I would like to spec it at 2V for extra resilience. The signal is differential if you aren't aware of this. It is like USB.

Title: Re: Schottky diode based Sense Circuit...
Post by loose-electron on Apr 8^th, 2011, 1:54pm

PCB or IC level design?

Digital sense output or buffered analog signal out?

Maximum frequency?

Accuracy of sensor (offsets?)

To be helpful, need a lot more info to define the problem.

Jerry