1. Quote of the week:
2. New challenge AQQ270 about a Difference Amplifier challenge (this is a proposal from our colleague
Martin Walker, Product Marketing Leader at ADI UK – warm thanks to him!):
Below is the classic difference amplifier circuit.
Questions:
1. What is the Common Mode Rejection Ratio (CMRR) if we have perfectly matched resistors? [Assume the amplifier’s CMRR is 120dB]
2. What is the CMRR if the resistors have a tolerance of 0.1%?
3. What is the CMRR if the resistors have a tolerance of 1%?
4. What input resistance does V2 ‘see’?
5. What input resistance does V1 ‘see’?
6. If the difference amplifier was AC-coupled, what impact would this inequality in input impedance have?
Good luck!
Edit Notes
removed inappropriate Quote[edited by: GenevaCooper at 1:18 PM (GMT -4) on 20 Sep 2024]
