Title :
A 0.5V 1KS/s 2.5nW 8.52-ENOB 6.8fJ/conversion-step SAR ADC for biomedical applications
Author :
Lu, Tsung-Che ; Van, Lan-Da ; Lin, Chi-Sheng ; Huang, Chun-Ming
Author_Institution :
Dept. of Comput. Sci., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
A low-FOM SAR ADC using the leakage reduction bootstrapped switch (LRBS) to achieve a satisfactory ENOB and using a low-power approach with a low voltage, low sampling rate, and low-DAC-capacitance structure is presented for biomedical applications. LRBS is proposed to alleviate the leakage caused by the low-power approach to increase SNDR and ENOB. From the measurement results, the 0.18μm CMOS prototype chip with the total DAC capacitance of 2.765pF consumes 2.5nW and achieves a SNDR of 53.05dB under a 0.5V supply voltage at 1KS/s with a Nyquist input. The resulting FOM is 6.8fJ/conversion-step.
Keywords :
CMOS digital integrated circuits; analogue-digital conversion; biomedical electronics; low-power electronics; CMOS prototype chip; Nyquist input; biomedical applications; conversion-step SAR ADC; leakage reduction bootstrapped switch; low sampling rate; low-DAC-capacitance structure; low-FOM SAR ADC; low-power approach; power 2.5 nW; size 0.18 mum; voltage 0.5 V; Capacitance; Capacitors; Clocks; Power demand; Semiconductor device measurement; Switches; Transistors;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2011 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4577-0222-8
DOI :
10.1109/CICC.2011.6055325
