Problem 3 (40 points): out Rc Suppose you have designed the circuit above with R

Question

Problem 3 (40 points): out Rc Suppose you have designed the circuit above with Ra-Rc-100 , and chosen Rb and Rd such that where, Adm is the difference-mode gain, and the common mode gain is zero (i.e. CMRR is infinity). However, the resistors you've used to build the circuit are not precise. Each of them has an x% error (therefore, a resistor with a nominal value of 100 ohms will actually have a resistance of 99 or 101 ohms). Write a MATLAB program to find the worst possible CMRR for a given value of x and Adm. Plot the CMRR (in dB) vs. x for x -1,2,... 10. Obtain three graphs (and display in the same window) for Adm = 1, 10 and 100.

Explanation / Answer

AD=V0/VD

CMRR=(Rb(RC+RD)+RC+RD)/RC+RD

AdM IS THE difference mode gain,the commen mode gain is zero

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