What is the best op amp or in amp to dc offset a signal from cmos?

Hi Azami,

Basically, both types of amplifiers can meet your requirements. But InAmp would be, in my opinion, an irrational choice, because this type of amplifier is designed to receive a differential signal and provides a high level of CMRR. This is not what you need for your design.

Do you have any initial ideas? Can you share them? Looking at the circuit diagram is much easier to analyze

Regards,

Kirill

Hi,

Thank you for your recommandations.

Actually i would like to you use AD8274 or AD8271 difference amplifier.

Should i use buffer amplifier (like LT1818) at inputs?

Hi Azami,

You can always find out if you need to use a buffer amplifier yourself, just by studying the specification of your CMOS device. The maximum output current must be specified there. 

Regards,

Kirill

I disagree with KirV.  An InAmp is fine for your application.

Look at the equation.  The InAmp will handle single ended or differential inputs

and then the REF pin offsets the result.

The choice of InAmp will depend on your supplies, signal frequency, how far you need to offset,

and temperature range.

Harry