CMRR against Tolerance

I'm given with a difference amplifier with each of the resistors having a tolerance 'alpha'. We're asked to plot CMRR against the variation in 'alpha' as alpha varies from 0.1 to 10%.It has to be done using a simulation software.How should I proceed?Also we're asked to find out the 'alpha' required to get a CMRR of 80dB

by shaileshsuresh
August 25, 2018

1 Answer

Answer by mikerogerswsm

Use the simulation software to find the common mode gain with resistors at their worst tolerances, for various values of alpha, as compared with the differential mode gain. CMRR of -80dB sounds very difficult. I guess resistor tolerances have to be rather better than 0.01%, how much better depending whether you add effects algebraically or statistically.

+1 vote
by mikerogerswsm
August 25, 2018

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