Title page for etd-0022114-114419


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URN etd-0022114-114419
Author Chih-Wei Wu
Author's Email Address d953040003@student.nsysu.edu.tw
Statistics This thesis had been viewed 5340 times. Download 11 times.
Department Computer Science and Engineering
Year 2013
Semester 1
Degree Ph.D.
Type of Document
Language English
Title Power Saving Technology for Thermometer-code Digital-to-analog Converters
Date of Defense 2014-01-16
Page Count 88
Keyword
  • power saving
  • switching scheme
  • calibration
  • high precision
  • high speed
  • DAC
  • Abstract In the mobile communication applications, the Digital-to-analog convert (DAC) needs higher and higher accuracy and speed. However, the operation time is limited by the battery capacity of the mobile devices. Increasing speed and accuracy are the trend of present DAC’s circuit design. To increase the operation time, reducing the power consumption of the DAC are necessary. As a result, the high speed and the low power consumption DACs are in high demand.
    The current-steering architecture is widely used in high-speed DACs, since this architecture has good linearity at high speed. Therefore, this thesis adopts the current-steering architecture to design the DAC in order to achieve the high-speed application. The power saving technology for the thermometer-code DAC is proposed in the thesis. This technique can reduce the power consumption and the clock feedthrough. Instead of the traditional design, which using clock signal to update all current cells in each period, this design detects the data variation first and then only update the current cells which actually change the data. The proposed design can save the power consumption produced by the latches switched.
    Finally, the design was fabricated in TSMC 90nm CMOS process. The sample rate and resolution of the DAC are 1GS/s and 12-bit, respectively. The power consumption is 30mW. The simulation results show that the proposed power saving technology can save power consumption. Even in the worst case, this technique can still save 10% power consumption.
    Advisory Committee
  • Tsung-Heng Tsai - chair
  • Yun-Nan Chang - co-chair
  • Shen-Fu Hsiao - co-chair
  • Shiann-Rong Kuang - co-chair
  • Ko-Chi Kuo - advisor
  • Files
  • etd-0022114-114419.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2014-01-22

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