This thesis presents the analysis, design, and measurements of the front end of a bandpass delta-sigma modulated RF transmitter. Currently, there is considerable interest in "direct" digital RF transmitters for simultaneous multi-task transmitting, where extraordinarily linear signal conversion is required. The delta-sigma modulated conversion provides a promising approach. Conceptually, a delta-sigma modulated RF transmitter has three stages: a bandpass delta-sigma modulator, a one-bit power digital-to-analog converter (DAC), and bandpass filtering circuits.
The one-bit power DAC has primary importance in the transmitter implementation, because it directly determines the system linearity performance. In this thesis, a circuit approach is described for analyzing the generation mechanisms of the nonlinear inter-symbol interference (ISI) in the one-bit power DAC. Single-ended and differential converter topologies are theoretically analyzed and experimentally characterized with a three-tone delta-sigma test signal. Additionally, the linearity performance of single-ended and differential configuration DACs with different bandpass filters is discussed, where the fundamental idea is that the load-circuit effect on the linearity performance of the DAC is determined by its input impedance.
|Commitee:||Coleman, Jeffrey, Curry, James, Filipovic, Dejan, Kuester, Edward, Maksimovic, Dragan|
|School:||University of Colorado at Boulder|
|School Location:||United States -- Colorado|
|Source:||DAI-B 70/04, Dissertation Abstracts International|
|Keywords:||Delta-sigma modulation, Digital-to-analog converters, Linearity, Nonlinear intersymbol interference, RF transmitters|
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