Delta-sigma modulators are currently a very popular technique for making high-resolution
analog-to-digital and digital-to-analog converters (ADCs and DACs). Most
delta-sigma modulators in production today employ single-bit quantization because a 1-bit DAC is inherently linear, whereas a multi-bit DAC is not. Were it not for this drawback,
the use of multi-bit quantization would improve a delta-sigma modulator's performance
by increasing the modulator's resolution or increasing the modulators's bandwidth, while
at the same time whitening the quantization noise and improving modulator stability. This
thesis explores the element-mismatch-shaping technique, which attenuates the noise
caused by static element mismatch in a multi-level DAC by a method similar to delta-sigma
modulation.
Existing element-matching techniques are reviewed and some analytical and
architectural work related to the realization of mismatch-shaping logic is presented. A
custom switched-capacitor (SC) DAC is used to verify various element mismatch-shaping
algorithms. Experiments show that mismatch-shaping can reduce harmonic distortion
by up to 30 dB. / Graduation date: 1998
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/33995 |
| Date | 08 May 1998 |
| Creators | Lin, Haiqing |
| Contributors | Schreier, Richard |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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