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low Signal amplification ?

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namster:
Hi,
I want to amplify a signal that has a full scale of 20mV, the major problem is the bottom of the signal (bellow the offset of Amplifier), I use a 4 wire Kelvin measurements, the two methods I think about is:
1 - a non inverting Amplifier with Jfet input like 34420a and a DAC For offset compensation
2- an Instrumentation Amplifier  ( Like AD8552 with 1 µV Offset )
so how can I amplify a voltage of 10µV with a gain of 350!

Marco:
How about just using a MAX4209 and manual zero'ing to get rid of the final offset?

dom0:
Bandwidth? Acceptable offset error?

Also


--- Quote ---a full scale of 20mV
--- End quote ---

vs


--- Quote ---mplify a voltage of 10µV with a gain of 350!
--- End quote ---

Those numbers are four orders of magnitude apart.

_Wim_:
If bandwidth is low, typically a chopper-stabilzed (CMOS) opamp is recommended for this application

_Wim_:

--- Quote from: dom0 on October 25, 2019, 07:20:49 pm ---Those numbers are four orders of magnitude apart.

--- End quote ---

I think he means the smallest expected input signal for the amplifier is 10µV, the largest is 20mV, both will be amplified with a gain of 350. The small signal has a high risk to be swamped by the offset voltage due to temperature variations

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