EE 445S Real-Time Digital Signal Processing Laboratory - Lecture 10

Lecture by Prof. Brian L. Evans

Announcements

Example tradeoffs in sampling rate and amplitude resolution for analog-to-digital converters a.k.a. digitizers:
NI PXIe-5186: two channels, 8 bits/sample, 12.5 GS/s sampling rate, 5 GHz bandwidth (Mar. 2011)
NI PXI-5154: two channels, 8 bits/sample, 2 GS/s sampling rate, 1 GHz bandwidth
NI PXIe-5122: 14 bits/sample, 100 MS/s sampling rate
NI PXI-5192: 16 bits/sample, 15 MS/s sampling rate
NI PXI-5192: 24 bits/sample, 500 kS/s sampling rate
Understanding PDM Digital Audio, Dr. Thomas D. Kite, Audio Precision. "PDM stands for pulse density modulation. However, it is really better summarized as 'oversampled 1-bit audio', as it is nothing more than a high sampling rate, single-bit digital system." This application note describes the signal processing involved in creating the output signal for a digital microphone.

Lecture on Data Conversion in PowerPoint format. Videos for Part 1 and Part 2 of the lecture.
Course Reader Appendix J Handout: Noise-Shaped Feedback Coding.

Bruce Wooley, "Cascaded Noise-Shaping Modulators for Oversampled Data Conversion", February 3, 2004, seminar given at UT Austin. Slide 10 quantifies the Dynamic Range vs. Oversampling Ratio for first-, second-, and third-order sigma-delta modulators.

Last updated 06/04/2014. Send comments to (Mailbox) bevans@ece.utexas.edu