EE 230 Lecture 38 Spring 2010

EE 230 Lecture 38 Spring 2010 - EE 230 Lecture 38 Data...

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EE 230 Lecture 38 Data Converters Time and Amplitude Quantization
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Review from Last Time:
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Review from Last Time:
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Study Abroad Opportunities in Asia Programs exist with both Tatung University and National Taiwan University of Science and Technology – both are in Taipei Both are good schools and both should provide a good study abroad opportunity If interested in either program make the following contacts: Tatung University Prof. Morris Chang (ISU coordinator) or Prof. Randy Geiger National Taiwan University of Science and Technology Prof. Randy Geiger (ISU coordinator) Review from Last Time:
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Metastability Flash ADC Metastability can never be eliminated in an ADC , its effects can just be reduced to a level that results in an acceptably low probability of causing an unacceptable outcome Pipelined Iterative (Algorithmic, Cyclic) Single- slope Serial Folded Interpolating Dual-slope Charge Redistribution Oversampled (Delta-Sigma) Successive Approximation (SAR) Review from Last Time:
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Engineering Issues for Using Data Converters 1. Inherent with Data Conversion Process Amplitude Quantization Time Quantization Present even with Ideal Data Converters 2. Nonideal Components Uneven steps Offsets Response Time Noise Present to some degree in all physical Data Converters How do these issues ultimately impact performance ? Review from Last Time:
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Time Quantization Sampling Theorem Aliasing Anti-aliasing Filters Analog Signal Reconstruction Review from Last Time:
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Time Quantization For convenience, consider a sinusoidal signal 1 f= T Consider a positive-edge triggered sampling clock signal CLK CLK 1 f= T Review from Last Time:
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Time Quantization How often must a signal be sampled so that enough information about the original signal is available in the samples so that the samples can be used to represent the original signal ? Review from Last Time:
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Time Quantization How often must a signal be sampled so that enough information about the original signal is available in the samples so that the samples can be used to represent the original signal ? t θ T/(2 π ) V M () ( ) M ft=Vs i n ω t- θ If the sampling times are known, there are two unknowns in this equation, V M and θθ . So two samples during this period that provide two non-zero values of f(t) will provide sufficient information to completely recreate the signal f(t)! θ Review from Last Time:
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Time Quantization How often must a signal be sampled so that enough information about the original signal is available in the samples so that the samples can be used to represent the original signal ? The Sampling Theorem An exact reconstruction of a continuous-time signal from its samples can be obtained if the signal is band limited and the sampling frequency is greater than twice the signal bandwidth.
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This note was uploaded on 02/01/2012 for the course EE 230 taught by Professor Mina during the Fall '08 term at Iowa State.

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EE 230 Lecture 38 Spring 2010 - EE 230 Lecture 38 Data...

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