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Differential preamplifier for oscilloscope
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jonpaul:
See Tektronix diff amp model AM502 , manual at w140, Bama archive.

https://w140.com/tekwiki/wiki/AM502

Also Oscilloscope Vertical Amplifiers  (Circuit Concepts Series) Tektronix: Bob Orwiler

Jon
sonpul:
I’ll add a few screenshots of SSM2019 working together with Siglent SDS1202X-E. 100kHz For the correct RMS value, see Stdev.

100kHz 1x probe



100kHz 1x probe Eres



100kHz SSM2019




David Hess:

--- Quote from: TimFox on December 07, 2023, 07:57:09 pm ---The simple four-resistor-plus-op-amp differential amplifier does have a CMRR limited by the resistor matching.
--- End quote ---

There is going to be confusion if confusing terms are used.  We should at least agree on definitions.

Differential amplifiers have differential inputs and outputs.  Difference and instrumentation amplifiers have differential inputs and single ended outputs.  Instrumentation amplifiers have high impedance inputs which minimize the effects of source impedance.

Texas Instruments among others likes to confuse the issue, but resist it.
TimFox:
At least the first eight definitions of "differential amplifier" that come up on Google state "A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs" (Wikipedia), and some others use the same definition for a "difference amplifier".
A push-pull, balanced, or "differential" output is not required, but may be used.
rfguy2020:
I have been considering to use AD8129 with their evaluation board:

https://www.analog.com/media/en/technical-documentation/user-guides/UG-133.pdf

AD8129 is not probably lowest noise, but it might do the job?
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