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Increasing the AD-system precision with 2 or more ADCs

Colleagues,

could you give me some links to app. notes that discuss the issue how to increase the AD-system precision with 2 or more ADCs.

We are looking for a solution to split a dynamic range into zones and scale them to ADC full scale dynamic range. Alternatively, we think about a possibility to sample by 2 ADCs with phase shift of 180 degrees. We expect many noise issues in the solutions and other possible problems.