I have to design a bio potential measurement system:

• AD converter and the connecting digital / software part
• an analog amplifier stage: basically a regular ECG amplifier composed of discrete instrumental amplifier

Googling around I see that the instrumental amplifier's reference input is driven by a miller integrator feedback.

My question is: what is the purpose / advantage of this miller integrator feedback?

I think, remove DC component can be easy in software side, hardware cost, size, complexity and PCB design can increase dramatically.

I have to design a bio potential measurement system:

• AD converter and the connecting digital / software part
• an analog amplifier stage: basically a regular ECG amplifier composed of discrete instrumentation amplifier

Googling around I see that the instrumentation amplifier's reference input is driven by a miller integrator feedback.

My question is: what is the purpose / advantage of this miller integrator feedback?

I think, remove DC component can be easy in software side, hardware cost, size, complexity and PCB design can increase dramatically.