An ultra low-power rail-to-rail comparator for ADC designs

This paper presents a novel ultra low-power rail-to-rail comparator which can be suitably used in low-to-medium speed A/D converters. This comparator adopts a preamplifier followed by a dynamic latch structure to achieve fast-decision, high-resolution as well as reduced kick-back noise. A new adaptive power control technique is used to reduce the power consumption of the preamplifier. The circuit is designed and simulated in Global Foundries 65nm CMOS technology. The simulation results have shown that the power consumption of 12-bit comparator is 191.2 nW at the clock frequency of 15 MHz and 0.8 V supply voltage with a delay of 1.17nS.

[1]  Eisse Mensink,et al.  A Low-Offset Double-Tail Latch-Type Voltage Sense Amplifier , 2007 .

[2]  Phillip E Allen,et al.  CMOS Analog Circuit Design , 1987 .

[3]  Chih-Cheng Hsieh,et al.  A new rail-to-rail comparator with adaptive power control for low power SAR ADCs in biomedical application , 2010, Proceedings of 2010 IEEE International Symposium on Circuits and Systems.

[4]  Pedro M. Figueiredo,et al.  Kickback noise reduction techniques for CMOS latched comparators , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[5]  Howard Tang,et al.  An energy recovery approach for a charge redistribution successive approximation ADC , 2010, 2010 International Conference on Microelectronics.

[6]  Jia Chen,et al.  A low-kickback-noise latched comparator for high-speed flash analog-to-digital converters , 2005, IEEE International Symposium on Communications and Information Technology, 2005. ISCIT 2005..

[7]  Chao Yuan,et al.  A novel low-voltage low-power SAR ADC for biomedical applications , 2011, 2011 IEEE 9th International New Circuits and systems conference.

[8]  Akira Matsuzawa,et al.  An experimental 0.6-V 57.5-fJ/conversion-step 250-kS/s 8-bit rail-to-rail successive approximation ADC in 0.18µm CMOS , 2009, 2009 16th IEEE International Conference on Electronics, Circuits and Systems - (ICECS 2009).