EE 230 Lab 13 Fall 2006 Data Converters - Nonideal Performance Limitations

EE 230 Lab 13 Fall 2006 Data Converters - Nonideal Performance Limitations

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EE 230 Fall 2006 Experiment 13 Data Converters – Performance Limitations associated with Nonideal Properties Special Instructions for this Experiment Since this experiment will be conducted during the last week of the semester, a report for this project will be turned in at the end of the period. There are 3 procedures listed for this experiment. You are to work sequentially on these procedures for the first 2 hours and 30 minutes of the lab period. At that time, you are to inform the TA exactly where you are in the measurements. The last 30 minutes are to be spent preparing a brief report which will be collected at the end of the laboratory period. Grades will be based upon how much progress you make on this experiment and on the brief report. Reports will only be accepted at the end of the laboratory period. If for any reason you can not spend the 3 scheduled hours working on this experiment, make arrangements in advance with your TA to attend a separate period. Purpose: The purpose of this experiment is to investigate some of the limitations of data converters associated with nonideal properties of data converters. In particular, the issue of linearity as characterized by the integral nonlinearity (INL), the differential nonlinearity (DNL) and the spectral performance as characterized by the spurious free dynamic range (SFDR) will be explored. Equipment: Computer with MATLAB software Data from Part 4 and Part 5 of Experiment 9 Background: Data converters are widely used as the interface between the analog environment and the digital world. Analog to Digital Converters (ADC) convert physical analog signals to digital form and Digital to Analog Converters (DAC) convert digital signals analog form. In most applications, it is expected that all information about the input signal to an ADC be preserved in the sampled outputs obtained from the ADC. Correspondingly, it is generally expected that the output of a DAC will create the desired analog signal. Existing data converters can come very close to accomplishing these tasks provided that the right data converter is used and provided it is used properly. Even if data converters are ideal, some potential problems can occur if the resolution is not high enough or if the sampling rates are too low. In some applications, the phase of the sampling clock is also very important. Inherent limitations associated with the data conversion process associated with ideal data converters were considered in the previous experiment. In this experiment, emphasis will be placed upon the performance capabilities and limitations associated with nonideal properties of data converters. The nonideal
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properties of data converters are analogous to the nonideal properties of operational amplifiers such as finite GB, finite gain, offset voltage, and output saturation considered in previous laboratory experiments.
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