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Instrumentation versus Fully Differential Amplifier

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Hi,

I understand my question might be a little to broad, but I was wondering what should be considered when selecting between either using a fully differential or instrumentation amplifier before an ADC?

My design consists of three stages, an RFI filter, pre-amplifier (FDA or In-Amp) and low-pass filter before the ADC. The ADC I am using will accept both single and differential inputs. I would prefer to use the differential input because I can obtain better resolution.

I am interested in low frequency signals (<1 Hz), and the source impedance is variable.

Please let me know there are any other details that would help answer the questions.
thanks.:grin:
 

either using a fully differential or instrumentation amplifier before an ADC?
Click to expand...
depends upon the nature of sensed signal.
If you are concerned about offset,CMRR and also higher gain of the input signal, then IA will be useful. Best of luck.
 

If the LPF is made from passive elements I prefer to have a buffer as 1st stage, RFI, another buffer, and LPF. So the overall performance is not a function from the signal source impedance. This scenario assumes IA as a buffer.
 

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