EECS240 – Spring 2008Lecture 7: Noise and FeedbackElad AlonDept. of EECSEECS240Lecture 72Noise and Feedback•Ideal feedback:•No increase of input referred noise•No decrease of SNR at output•Practical feedback: increased noise•Noise from feedback network•Noise gain from elements outside feedback loop
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EECS240Lecture 73Ideal Feedback and Noise•Ideal (noiseless) feedback network:•Noise doesn’t change •Real feedback elements have noise though…EECS240Lecture 74Real Feedback•Conceptually identical to standard two port calculations•Use Rs = 0 to find vi,eq2Rs = ∞to find ii,eq2•Calculations get tedious…