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HW_9 Solutions

# HW_9 Solutions - EE 338K Homework Solutions 813.5 2...

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EE 338K Homework Solutions Assignment #9 Page 5 5. (RMS) V 492 . 57 1 µ = oR e , (RMS) nV 2 . 575 2 5 . 813 1 = = R e (from simulator) 95 . 99 10 2 . 575 10 492 . 57 9 6 1 1 = × × = R oR e e (minus sign determined from oscilloscope display) 6. (RMS) V 707 . 5 µ = + n oi e , (RMS) pA 54 . 56 2 96 . 79 = = + n i (from simulator) Note: The + n oi e measurement was obtained with the n i source removed from the subcircuit. × = × × = + + 10 009 . 1 10 54 . 56 10 707 . 5 5 12 6 n oi i e n Problems 1 and 2 illustrate how the values of the noise figures of two different Op Amps in identical circuits behave as a function of the source resistance, R s . In problem 1, where R s = 10k , the OP27 produces the lowest (best) noise figure. In problem 2 the TL071 has the lowest noise figure. All else being equal the dependence of the noise figure on R s involves both the noise voltage, n e , and the noise current, ( ) n n i i = + . Op Amps with lower values for the noise voltage, n e , produce lower noise figures for lower values of
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