EE 435 Lect 33 Spring 2010

EE 435 Lect 33 Spring 2010 - EE 435 Lecture 33 DAC Design...

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EE 435 Lecture 33 DAC Design
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ENOB Summary ( ) REF 2 ENOB=-log INL -1 Resolution: l 2 10 ACT 2 ACT 10 log N ENOB = og N log = INL: ( ) R 2 ENOB = n -log -1 υ n R specified res, ν INL in LSB INL REF INL rel to X REF Quantization noise: dB SNR -1.76 ENOB = 6.02 dB SNR ENOB = 6.02 rel to triangle/sawtooth rel to sinusoid DNL: HW problem .• Review from last lecture .• • •
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Absolute Accuracy Absolute Accuracy is the difference between the actual output and the ideal or desired output of a data converter Absolute accuracy provides no tolerance to offset errors, gain errors, nonlinearity errors, quantization errors, or noise In many applications, absolute accuracy is not of a major concern but … scales, meters, etc. may be more concerned about Absolute accuracy than any other parameter The ideal or desired output is in reference to an absolute standard (often maintained by the National Bureau of Standards) and could be volts, amps, time, weight, distance, or one of a large number of other physical quantities) .• Review from last lecture .• • •
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Relative Accuracy In the context of data converters, pseudo-static Relative Accuracy is the difference between the actual output and an appropriate fit-line to overall output of the data converter In many, if not most, applications, relative accuracy is of much more concern than absolute accuracy INL is often used as a measure of the relative accuracy Some architectures with good relative accuracy will have very small deviations in the outputs for closely-spaced inputs whereas others may have relatively large deviations in outputs for closely-spaced inputs DNL provides some measure of how outputs for closely-spaced inputs compare .• Review from last lecture .• • •
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