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3. [20%] Calculate the noise (PSD) across the output of a Wheatstone bridge due to Johnson noises. Assume R1, R2, R3, R4 are not equal (so their resistances are R1, R2, R3, and R4). Hint: (1) VB is ground for noise analysis; (2) Vnl and Vn2 can be readily calculated based on equivalent resistance. R4 R1 Vn1 Vn2 -OVon O R3 R2

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