Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1c18dk14x

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  • 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.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-26T18:33:04Z (GMT) No. of bitstreams: 1 ShuiTao1998.pdf: 5816640 bytes, checksum: 1cbbaf265c5ab594aa089a13d35dac5b (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-26T18:33:58Z (GMT) No. of bitstreams: 1 ShuiTao1998.pdf: 5816640 bytes, checksum: 1cbbaf265c5ab594aa089a13d35dac5b (MD5)
  • description.provenance : Made available in DSpace on 2012-09-26T18:33:58Z (GMT). No. of bitstreams: 1 ShuiTao1998.pdf: 5816640 bytes, checksum: 1cbbaf265c5ab594aa089a13d35dac5b (MD5) Previous issue date: 1998-05-08

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