How remove DC offset from signal?

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Astrid

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Hello,
I have 3 step amplifier compound from three AD8021, non inverting amp G=10x,
viz. https://www.analog.com/static/imported-files/data_sheets/AD8021.pdf
Intention is amplified small AC signal 10x10x10=1000x with low noise, low phase shift and low distorsion.
Problem is relatively large DC offset of AD8021 ~1000uV.
How and where remove DC component from signal?

Thanks
 

Take a look at application note AN-202.
**broken link removed**
 

Store offset in one phase and cancel offset in another phase with stored offset.
 

Depending on the frequency range of the signal, you could simply drop in a series capacitor to AC couple the signal between the gain stages. Without any information about the frequency content of your signal, it's hard to say if that would be a good solution or not.
 

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