A question I have heard on this topic is as follows:
Is an Instrumentation Amplifier with 100 db good enough for an ECG system?
Can you please address this?
Hello Andy !
To answer your question, it depends on the application and the design of the ECG front end system itself. Typically 100 db reference to the isolated common of the ECG system is adequate. However in specific parts of the World such as Australia where the AC mains can reach 264 VAC rms the CMRR may need to be higher like on the order of 120 db.
Please note that there are ways to 'enhance' the effective CMRR by use of Right Leg Drive, Common Mode to Differential mode conversion mitigation, etc.
One of the common problems with CMR is not the CMR of the INA as much as it is the common mode to differential mode conversion that can occur prior to the INA. There are numerous ways to help with this problem and we can discuss if you wish.
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