Title :
Design of an ultra-low power SAR ADC for biomedical applications
Author :
Zhang, Hui ; Qin, Yajie ; Yang, Siyu ; Hong, Zhiliang
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
Abstract :
In this paper, an ultra-low power 12-bit 2 kS/s successive approximation register (SAR) analog-to-digital converter (ADC) is presented. For power optimization, the voltage supply of the digital part is lowered, and the offset voltage of the latch is self-calibrated. Targeted for lower noise, a low kick-back noise latch is proposed. The chip was fabricated using 0.18 μm 1P6M CMOS technology. The ADC achieves SNDR of 61.8 dB and dissipates only 455 nW, resulting in a figure of merit (FOM) of 220 fJ/conversion-step. The ADC core occupies an active area of 674×639 μm2.
Keywords :
CMOS integrated circuits; analogue-digital conversion; biomedical equipment; calibration; optimisation; 1P6M CMOS technology; analog-to-digital converter; biomedical applications; dissipation; low kick-back noise latch; power 455 nW; power optimization; self-calibration; size 0.18 mum; successive approximation register ADC; ultra-low power SAR ADC; Biomedical measurements; Capacitors; Frequency measurement; Latches; Noise; Preamplifiers; Solid state circuits;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2010 10th IEEE International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-5797-7
DOI :
10.1109/ICSICT.2010.5667670
