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Differential Probe - Reverese Engineered
Differential Probe - Reverese Engineered
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Old 5th January 2014, 06:52 PM   #11
Samuel Groner is offline Samuel Groner  Switzerland
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Location: Zürich
I'd say something like a LM6171 or THS4011 would be a more appropriate choice. The main features of the AD797 (DC precision, low distortion, low voltage noise) are of little relevance here, and the higher speed/bandwidth of the above parts probably necessary for 25 MHz operation.

Samuel
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Old 6th January 2014, 05:03 PM   #12
JensH is offline JensH  Denmark
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Differential Probe - Reverese Engineered
You are right about the bandwidth. The AD797 has got a relatively high GBW product, but there isn't much output in the MHz region, and certainly not at 25 MHz. I guess I was mislead by the AD797 shown in the schematic of the through-hole version. Probably just a placeholder.
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Old 7th January 2014, 03:19 PM   #13
underwurlde is offline underwurlde  United Kingdom
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Location: S.England
@JensH : yes, just a place-holder, an OpAmp I chose purely because a) it was in my schematic library and b) the pin-out was the same.

Apologies for any misleading confusion there.

Note use of TrimPot for offset null on the OpAmp (on the THP version), hence maybe not either an LM6171 or THS4011.

Andy

Last edited by underwurlde; 7th January 2014 at 03:28 PM.
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Old 21st March 2014, 04:57 AM   #14
gmphadte is offline gmphadte  India
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The op-amp is most probably a video op-amp. An AD8023 works even at 250MHz.

Gajanan Phadte
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Old 21st April 2014, 06:46 AM   #15
ScreamingLordByron is offline ScreamingLordByron  United States
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What is the package size of C1? I see the front-end R's carrying the big voltage are 1206. But are the front-end C's also?

TIA
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Old 22nd April 2014, 09:43 AM   #16
underwurlde is offline underwurlde  United Kingdom
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As memory serves I think they are 1206's too.

A
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Old 26th April 2014, 02:15 PM   #17
rikkitikkitavi is offline rikkitikkitavi
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What

l
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Old 27th April 2014, 06:28 AM   #18
rikkitikkitavi is offline rikkitikkitavi
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Ok, something went wrong here...

What is the most important in a diff probe , right layout seems very critical to maintain a good CMRR ?
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Old 2nd May 2014, 03:49 PM   #19
AndrewT is offline AndrewT  Scotland
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If these are really this simple, then why are they charging hundreds of GBP for them?

What is increasing the asking price so much?
Testing, calibration?
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Old 6th May 2014, 07:34 AM   #20
underwurlde is offline underwurlde  United Kingdom
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One would imagine the calibration of such devices would be the major cost impact. Other than that, I like yourself cannot see why they would be any more than say £30ish if produced in any great quantity. Maybe they are low (sub 10K p.a.) volume and that too would have an impact on pricing. Shipping and retail markup will add a chunk of cost too.

A
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