A 0.4V 6.5nW 10b 2.5kS/s asynchronous SAR ADC

Author

Dong-Shin Jo ; Seung-Tak Ryu

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. Sci. & Technol., Daejeon, South Korea

fYear

2011

fDate

24-25 Aug. 2011

Firstpage

1

Lastpage

2

Abstract

A 0.4V 6.5nW 10b 2.5kS/s SAR ADC is proposed for energy-limited applications such as wireless micro-sensor networks, biomedical, and energy harvesting systems. The ADC operates at extremely low supply voltage (0.4V) to reduce power consumption and to eliminate short-circuit current. The channel length of MOSFETs in digital block is optimized to minimize digital power consumption. Small unit capacitor and low top parasitic capacitance is obtained by the proposed capacitor structure. The simulation results show that SFDR, SNDR, ENOB are 63.8dB, 58.1dB and 9.4bit at Nyquist input frequency, respectively. The figure-of-merit (FOM) is 3.98fJ/conv-step.

Keywords

MOSFET; analogue-digital conversion; ENOB; MOSFET; Nyquist input frequency; SFDR; SNDR; asynchronous SAR ADC; channel length; digital power consumption; energy-limited applications; extremely low supply voltage; figure-of-merit; parasitic capacitance; power 6.5 nW; voltage 0.4 V; word length 9.4 bit; Capacitance; Capacitors; Inverters; Metals; Power demand; Simulation; Switches; Asynchronous; Low power; SAR ADC; biomedical; energy harvesting;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Radio for Future Personal Terminals (IMWS-IRFPT), 2011 IEEE MTT-S International Microwave Workshop Series on

Conference_Location

Daejeon

Print_ISBN

978-1-4577-0961-6

Electronic_ISBN

978-1-4577-0963-0

Type

conf

DOI

10.1109/IMWS2.2011.6027215

Filename

6027215