Lecture_11 - Filters, noise, digitization RC circuits low-...

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1 Filters, noise, digitization CHM6158C - Lecture 11 Feb 22 RC circuits low- and high-pass filters noise digital signals and averaging
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2 RC circuit Remember voltage profile on resistor as a function of time? What happens for AC signals?
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3 High- and low-pass filters Low-pass filter and high-pass filter Cut out low or high-frequency noise 2 2 2 1 ) ( ) ( + = fC R R V V i p O p π High-pass filter output: What will the output voltage across the resistor be for frequency f 0, f ?
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4 Cut-off What is RC for R = 10 k Ω , C = 0.1 μ F? Figure source: Instrumental Analysis , 6th Ed., Douglas A. Skoog, F. James Holler and Stanley R. Crouch, Thomson Brooks/Cole, 2007. (Chapter 5)
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5 Sources of noise Chemical noise (e.g. variations in temperature and pressure, fluctuations in humidity, changes in light intensity, etc.) Instrumental noise Thermal or Johnson noise (often due to agitation of electrons in electrical circuits charge inhomogeneity
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This note was uploaded on 07/30/2011 for the course CHM 6158 taught by Professor Polfer during the Spring '11 term at University of Florida.

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Lecture_11 - Filters, noise, digitization RC circuits low-...

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