Title :
A 51fA/Hz0.5 low power heterodyne impedance analyzer for electrochemical impedance spectroscopy
Author :
Jing Guo ; Waichiu Ng ; Jie Yuan ; Mansun Chan
Author_Institution :
ECE Dept., Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
This paper presents the design of a low-power highly sensitive impedance analyzer for electrochemical impedance spectroscopy (EIS) in a 0.18μm CMOS process. The analyzer uses a low-power current buffer with high gain to suppress the noise from the back-end. A heterodyne mixer is designed to reduce the flicker noise of following stages. It also enables the simultaneous recording of the amplitude and phase information. Experiments show it enables GΩ impedance sensing up to 100kHz with 51fA/Hz0.5 noise and 89μW power.
Keywords :
CMOS analogue integrated circuits; amplifiers; electrochemical impedance spectroscopy; flicker noise; integrated circuit noise; interference suppression; low-power electronics; mixers (circuits); molecular electronics; CMOS process; EIS; amplitude; current amplifier; electrochemical impedance spectroscopy; flicker noise; heterodyne mixer; impedance sensing; low power heterodyne impedance analyzer; low-power current buffer; low-power highly sensitive impedance analyzer design; noise suppression; phase information; power 89 muW; size 0.18 mum; 1f noise; Capacitors; Electrodes; Impedance; Iron; Mixers; current sensing; electrochemical impedance spectroscopy; heterodyne conversion; impedance sensing;
Conference_Titel :
VLSI Circuits (VLSIC), 2013 Symposium on
Conference_Location :
Kyoto
Print_ISBN :
978-1-4673-5531-5
