Sigma-Delta Modulators for Broadband applications
| SPEAKER: | Mr. Y. Zhu |
| DATE: | Tuesday 27 February,2007 |
| TIME: | 11:10 |
| VENUE: | EM316 Directions |
- Abstract:
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Sigma-Delta Modulator (SDM) ADCs can achieve good resolutions with comparatively simple circuitries. This advantage is from the technique called noise shaping that filters the quantisation error out of the band of interest, therefore a very coarse quantiser (as simple as single-bit) can be used. However, due to the bandwidth limitation of noise shaping, a large Oversampling Ratio (OSR) is demanded for a proper SDM function. This also can be interpreted as narrowband applications, such as for audio devices. Recently in both of the research and industry domains, great efforts have been put on expanding the SDM bandwidth to accommodate modern broadband communications.
This seminar will first review the SDM fundamentals, then particularly focus on multi-bit SDMs targeting for multi-ten megahertz bandwidth applications. Discrete-time and continuous-time modulator will be covered including the system level analysis, transfer function synthesis, and the circuit level design. Not only the noise transfer function, but also the signal transfer function will be discussed for the purpose of better stability, anti-aliasing, and adjacent channel power rejection. - Biography:
Yingbo Zhu: Received the B.S degree in Physics from the University of Science and Technology of China, in 1994. From 1994 to 2001, he served the industry in the areas of semiconductor device manufacturing, computer motherboard and ASIC development. In 2001, he join ChipTech in the Engineering School in the Adelaide University as a Ph.D candidate. His research interests are analog/mixed-signal IC design, Simga-Delta Modulator and RFIC frontend design. Since 2006, he started post-doctoral in the same group working on a 60GHz radio frequency synthesiser development.
