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Delta-sigma modulators employing continuous-time circuits and mismatch-shaped DACs.

Bo. Zhang Oregon State University. 1996

Dissertation Abstracts International 57-06B.

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題名:
Delta-sigma modulators employing continuous-time circuits and mismatch-shaped DACs.
著者: Bo. Zhang
Oregon State University.
主題: Engineering, Electronics and Electrical; Engineering, System Science
所屬期刊: Dissertation Abstracts International 57-06B.
描述: Delta-sigma modulators are currently a very popular technique for making high-resolution analog-to-digital and digital-to-analog converters. 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. Though the initial uses of delta-sigma modulators were in the audio field, the development of bandpass modulators opened up the application rangle to radar systems, digital communication systems and instruments which convert IF, or even RF, analog signals directly to digital form.
This thesis presents a method used to analyze and synthesize continuous-time delta-sigma modulators for given specifications. A fourth-order prototype continuous-time bandpass delta-sigma modulator employing g$\sb{\rm m}$-LC resonator structure is demonstrated on a PCB board and measurement results corroborate the theory. To allow the construction of very high performance delta-sigma modulators, this thesis presents an architecture for a multibit DAC constructed from unit elements which shapes element mismatches. Theoretical analysis and simulation shows that this architecture greatly increases the noise attenuation in the band-of-interest and facilitates the use of multibit quantization in delta-sigma modulators. The methods presented in this thesis will allow high-frequency wideband bandpass delta-sigma modulators to be constructed.
出版者: Thesis (Ph.D.)--Oregon State University, 1996.
建立日期: 1996
格式: 160 p..
語言: 英文
資源來源: NUTN ALEPH

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Delta-sigma modulators employing continuous-time circuits and mismatch-shaped DACs.

Bo. Zhang Oregon State University. 1996

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