A 6-bit Pipelined Analog-to-Digital Converter with Open-Loop Residue Amplification and Digital Self-Calibration

• Main Authors: Yu-Hsun Chen, 陳昱勛
• Other Authors: Tai-Cheng Lee
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/v5av2k

碩士 === 國立臺灣大學 === 電子工程學研究所 === 92 === By aggressive device scaling in modern integrated circuit technology, the computing power of digital circuits increases significantly. But the low power supply and relative high threshold voltage of transistors exhibit design constraints for analog circuit. Analog-to-digital converters provide the link between the analog world and the digital system. Due to their extensive use of analog and mixed analog-digital operations, A/D converters often appear as the bottleneck in data processing applications, limiting the overall speed or precision. For the increasing demand for portability and system-on-a-chip (SoC) integration, low-power dissipation and the compatibility with deep-submicron technology have emerged as important metrics in state-of-the-art ADC design. In SoC implementations, data converters are embedded on the same chip with powerful fine-line digital signal processing, resulting in a limited budget for their total heat and power consumption. In this thesis, we describe the implementation and measurement results of a 6-bit pipelined ADC with open-loop residue amplification and digital self-calibration. Employing open-loop amplifiers in one-bit-conversion-per-stage architecture, the circuit operates in high speed and low power consumption. Using a constant-gm biasing technique, the open-loop amplifier is process-and-temperature insensitive. Comparator offset and full-scale error are removed by digital self-calibrated correction mechanism. Because of no requirement of MIM or PIP capacitors, this design is capable to be fabricated in digital process. Designed in a 0.13-μm technology and powered 1.2-V supply voltage, the A/D converter operates at 500-MHz clock-rate while dissipating 13.2 mW.