Linear Interpolation D/A Converter Applied to Direct Digital RF Modulators

Abstract

This thesis deals with techniques for the full integration of radio frequency (RF) transmitter with CMOS technology. The theory and implementation of high performance digital-to-analog converters (DACs) for radio frequency (RF) transmitters have been studied. A linear interpolation DAC architecture is proposed. By employing the linear interpolation, the attenuation of DAC's image components is significantly increased. The proposed linear interpolation DAC has been applied to direct digital quadrature modulators. The reconstruction filter, usually employed after the DAC in modulators to remove the image components, is eliminated due to this linear interpolation DAC's high attenuation to the image components. Therefore, the costly discrete components are reduced, and the system-onchip (SOC) design can be realized conveniently. A CMOS current injection direct digital RF quadrature modulator and A CMOS current-folded direct digital RF quadrature modulator have been implemented. In the architecture of current injection direct digital RF quadrature modulator, the DAC's differential current signals are directly fed to the mixer, which improves the linearity of the modulated RF signal. In the architecture of current-folded direct digital RF quadrature modulator, the DAC's differential current signals are fed to the mixer by current-folded structures, which realize the low voltage design and improves the linearity of the modulated RF signal also. The proposed modulators generate quadrature modulated RF signals directly and are able to operate with different types, constant and non-constant envelope, of modulations.

• author: Yijun, Zhou
• supervisor: [unknown] [unknown]
• opponent: Prof Vesterbacka, Mark, Inst för systemteknik, Linköpings universitet, 581 83 Linköping
• organization: Department of Electrical and Information Technology
• publishing date: 2003
• type: Thesis
• publication status: published
• subject: Electrical Engineering, Electronic Engineering, Information Engineering
• keywords: Elektroteknik, Electrical engineering, SOC., quadrature modulator, interpolation, filter, DSP, CMOS, DAC
• pages: 180 pages
• defense location: Room E:1406, E-building, Lund Institute of Technology
• defense date: 2003-06-12 10:15:00
• language: English
• LU publication?: yes
• additional info: Article: I. Yijun Zhou, Jiren Yuan,"An 8-bit, 100-Mhz CMOS linear interpolation DAC," accepted for publication in IEEE Journal of Solid- State Circuits.II. Yijun Zhou, Jiren Yuan,"A 10-Bit, 100-MHz CMOS Linear Interpolation DAC," Proceedings of the 28th European Solid-State Circuit Conference, ESSCIRC 2002, Page(s): 471-474.III. Yijun Zhou, Jiren Yuan,"A 10-bit Wide Band CMOS Direct Digital RF Amplitude Modulator," accepted for publication in IEEE Journal of Solid-State Circuits.IV. Yijun Zhou, Jiren Yuan,"A 10-Bit, 1-GHz CMOS Current-Folded Direct Digital RF Amplitude Modulator," submitted to IEEE Transaction on Vehicle Technology.V. Yijun Zhou, Jiren Yuan,"A Highly Integrated CMOS Direct Digital RF Quadrature Modulator," submitted to IEEE Journal of Solid-State Circuits.VI. Yijun Zhou, Jiren Yuan,"A CMOS Current-Folded Direct Digital RF Quadrature Modulator," submitted to IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing.
• id: e754883d-f209-4251-8d52-c7eff5d55e9c (old id 465982)
• date added to LUP: 2016-04-01 16:40:34
• date last changed: 2018-11-21 20:43:21