A Self-Biased Current-Mode Amplifier With an Application to 10-bit Pipeline ADC

作者：Choi Seungnam^*; Suh Yunjae; Lee Joohyun; Kim Jinkyu; Kim Byungsub; Park Hong June; Sim Jae Yoon

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2017, 64(7): 1706-1717.

DOI：10.1109/TCSI.2017.2676105

• Analog-to-digital converter (ADC)
• current sense amplifier
• operational amplifier
• pipeline ADC

This paper presents a self-biased current-mode amplifier (CMAMP) suitable for a switched-capacitor circuit. The CMAMP uses a subthreshold-biased transimpedance stage as a current-sensing load, and minimizes static power dissipation by passing bias current only at the input stage. The firstorder system behavior with single dominant pole gives stable phase margin without complicated frequency compensation. Self-biasing circuits automatically generate bias voltages to sustain performance over a wide range of supply voltage. The designed CMAMP is verified in a 10-bit pipeline analog-to-digital converter (ADC) fabricated in a 65-nm CMOS process. The ADC achieves a figure of merit of 14.3 fJ/c-s with a supply voltage of 0.6 V at 2.5 MS/s.

• 出版日期2017-7