A 10-bit CMOS Capacitive and Resistive D/A Converter Integrated with Self-adjusted Reference Circuit

Abstract

A 10-bit, digital-to-analog converter (DAC) for static/dc operation is fabricated in a standard 0.5 ¼ complementary metal oxide semiconductor (CMOS) process. The DAC is optimized for system-on-chip (SOC) readout circuits. A capacitive and resistive DAC is adopted for the DAC core to obtain area reduced and good monotony. A self-adjusted reference circuit is proposed in order to provide differential reference voltages for getting better accuracy. A unique common centroid layout is used in the capacitor network to reduce the effect of thermal or process linear gradients. The measured results of our work with integral non-linearity (INL) and differential non-linearity (DNL) are less than 0.54 LSB and 0.43 LSB, respectively. The power consumption is about 16 mW.

Keywords:

• Capacitor network
• Digital-to-analog converter
• Resistor network
• Self-adjusted reference circuit

Additional information

Notes on contributors

Chaoqun An

Chaoqun An received the B.S. degree from the Faculty of Material, Optoelectronics and Physics, Xiangtan University in 2009. From September 2009, she is a graduate student in Xiangtan University. From June 2010, she is with Microelectronics, Optoelectronics and System On a Chip (IMOS) Institute, Xiangtan University. Her research interests include digital to analog converter (DAC) and readout circuit design. E-mail: [email protected]

Jing Xie

Jing Xie received the B.S. degree from the Faculty of Material, Optoelectronics and physics, Xiangtan University in 2010. From September 2010, she is a graduate student in Xiangtan University. And, she is with Microelectronics, Optoelectronics and System On a Chip (IMOS) Institute, Xiangtan University. Her interest is in analog integrated circuits. E-mail: [email protected]

Weidi Peng

Weidi Peng received the B.S. degree from College of Electromechanical Engineering, Hunan University of Science and Technology in 2010. From September 2010, she is a graduate student in Xiangtan University. And, she is with Microelectronics, Optoelectronics and System On a Chip (IMOS) Institute, Xiangtan University. Her interest is in analog integrated circuits. E-mail: [email protected]

Yicheng Zeng

Yicheng Zeng was born in China in 1962, He graduated from Huaihua college in 1982, and received the Master degree from the Sichuan Normal University in 1991, and the Ph.D. degree from the Zhejiang University in 2002. Since 2004, he has been a professor of electronics in Department of Photoelectric Engineering, Xiangtan University. Currently, his research interests include nonlinear circuits and signal processing. E-mail: [email protected]

Xiangliang Jin

Xiangliang Jin received the MSc degree in microtechnology with emphasis in electric circuits from Hunan University in 2000. He received the PhD degree in micro-electronics and solid-state circuits with emphasis in CMOS image sensor design from institute of microelectronics of Chinese academy of sciences in March 2004. After graduation, he sets up Superpix Micro technology Ltd. as one co-founder. From March 2010, he is a full professor in Xiangtan University. His interests include MEMS and readout circuit design, CMOS image sensor design, and mixed-mode application-specific integrated circuits with emphasis on high-performance imaging. E-mail: [email protected]