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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 |
August 25, 2018 |
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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. |
by mikerogerswsm August 25, 2018 |
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