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Precision opAmp with a GBW Greater than 200MHz

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Amr Wael

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Hello,
I am looking for a precision opamp with a high gain bandwidth product above 200MHz that can tolerate high common mode voltages , +/- 20V
I have seen a lot of ICs for different manufacturers , analog devices , TI,ST etc but all the ICs I find either have very low voltage supply which results in low common mode voltage or their GPW is less than my requirement. Do you have any recommended ICs or do you have a solution for decreasing the common mode voltage without attenuating the differential input?
Thank you very much in Advance!
 

dick_freebird

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If you want 200MHz GBW are you really also
looking for DC accuracy? Maybe it's time to
revisit the error budget and what really matters.
Not "nice to have" or "wouldn't it be great?".

DC-blocking might take care of the common
mode if that varies slowly. Breaking the chain
into stages might let you do common mode
subtraction and then your differencing, at low
stage gains apiece preserving BW@gain.

If common mode is slow then perhaps a CMFB
and resistor-summing could be a way to go,
but all that adds to input DC inaccuracy
unless you use super accurate resistors etc.
(and complexity may add AC inaccuracy,
gain error from shunt C mismatches etc. in
the larger assembly?).
 

danadakk

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