Delta-sigma modulators are currently a very popular technique for making high-resolution
analog-to-digital converters (ADCs) and digital-to-analog converters (DACs).
These oversampled data converters have several advantages over conventional Nyquist-rate
converters, including an insensitivity to many analog component imperfections, a
simpler antialiasing filter and reduced accuracy requirements in the sample and hold. A
recent development in the realm of delta-sigma-based ADC and DAC systems is the use of
multilevel (as opposed to binary) quantization. This development owes its existence to the
discovery of a variety of techniques which cause linearity errors of the embedded
multilevel DAC to be attenuated in the frequency band of interest.
This thesis presents several methods for shaping the DAC element mismatch error
and reducing the dynamic error in the band of interest. To demonstrate the effectiveness of
the proposed algorithms, a current-mode unit element DAC is designed and used as a test
bed. Both theoretical analysis and experimental results show that these methods can
greatly attenuate the noise in the band of interest. The methods presented in this thesis will
allow high performance, high-frequency wideband delta-sigma modulators to be constructed. / Graduation date: 1998
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33910 |
| Date | 08 May 1998 |
| Creators | Shui, Tao, 1969- |
| Contributors | Schreier, Richard |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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