Charles,
ADA4817 has a very high input impedance (I think in parallel with 1-2pF) and
works well up to 500MHz.
Alternatives are
AD8000
LTC6417
EL5166
LTC6409
LM301
CLC425
LMH6629
OPA687
All of them are trade-offs between impedance, noise and bandwidth.
David
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Grasso, Charles
Sent: Friday, February 12, 2016 2:45 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Measuring HF signals with no corruption.
Hello,
We need to use a high speed clock from our mother board to enable a functional
check circuit. One of the obvious constraints is that the signal "tap" is not
permitted to change the signal in any way.
One solution would be to use opamps (which have a high z input) however I
cannot seem to find a solution that is fast enough. (The signal is LVDS based
and the spec says the 20-80 rise time min is 500ps running at 200MHz)
My initial thought is that I would need a gain/bw product of around 1GHz.
Does this august body agree?
That being the case - would someone be so kind as to point me at a part that
might work?
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications
(w) 303-706-5467
(c) 303-204-2974
(t) 3032042974@xxxxxxxxx<mailto:3032042974@xxxxxxxxx>
(e) charles.grasso@xxxxxxxxxxxx<mailto:charles.grasso@xxxxxxxxxxxx>
(e2) chasgrasso@xxxxxxxxx<mailto:chasgrasso@xxxxxxxxx>
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