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Circuit and Systematic Design of Low Power SAR ADC

Yazdani, Behnam | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47399 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sharif Khani, Mohammad
  7. Abstract:
  8. Low power and high speed analog-to-digital converters (ADCs) are the key elements of communication and computing systems. There are several ADC structures such as delta-sigma, flash, pipeline, and successive approximation register (SAR) for different applications, albeit SAR ADCs are natural candidates of onchip designs for their low power and scalability benefits. Nowadays, SAR ADCs are widely being used in low-power moderate-resolution applications which need several tens of MS/s to low GS/s sampling rates. By virtue of the technology scaling power consumption of digital parts of a SAR ADC is reduced significantly. As a result, in a SAR ADC the power consumption of the digital-to-analog converter (DAC) is dominant compared to other parts. In recent years, several works have been reported to reduce power consumption of DACs. In this research, three methods are presented to reduce power consumption and number of capacitors of the DAC. The first two methods reduces the number of capacitors by 50% compared to the conventional binary weighted DAC. In addition, through using these methods the switching energy is reduced by 97.66% and 93% compared to the conventional binary weighted DAC, respectively. In the third method, the switching energy and area of the DAC are reduced by 96.89% and 75% compared to the conventional binary weighted DAC. To verify the benefits of the third proposed method, an 8-bit SAR ADC was designed in 0.18 μm CMOS technology. Simulation results prove that 733µW power consumption is achieved at 30MS/s with the ENOB of 7.87 bit
  9. Keywords:
  10. Analog to Digital Converter ; Digital to Analog Converter ; Successive Approximation Register (SAR) ; Low-Power Design ; Capacitive Digital To Analog Converter

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