Title :
Dual-slope capacitance to digital converter integrated in an implantable pressure sensing system
Author :
Sechang Oh ; Yoonmyung Lee ; Jingcheng Wang ; Zhiyoong Foo ; Yejoong Kim ; Blaauw, D. ; Sylvester, Dennis
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
This work presents a dual-slope capacitance to digital converter for pressure sensing. The design uses base capacitance subtraction with a configurable capacitor bank and dual precision comparators to improve energy efficiency, consuming 110nW with 9.7b ENOB and 0.85pJ/conv·step FoM. The converter is integrated with a pressure transducer, battery, processor, and radio to form a complete 1.4mm×2.8mm×1.6mm sensor system aimed at implantable devices. The system operates from a 3.6V battery.
Keywords :
biomedical electronics; biomedical transducers; capacitance measurement; capacitive sensors; comparators (circuits); convertors; pressure sensors; pressure transducers; prosthetics; base capacitance subtraction; battery; configurable capacitor bank; dual precision comparator; dual-slope capacitance to digital converter integration; energy efficiency; implantable device; implantable pressure sensing system; power 110 nW; pressure transducer; processor; voltage 3.6 V; Batteries; Capacitance; Capacitors; Discharges (electric); Micromechanical devices; Sensors; Solid state circuits;
Conference_Titel :
European Solid State Circuits Conference (ESSCIRC), ESSCIRC 2014 - 40th
Conference_Location :
Venice Lido
Print_ISBN :
978-1-4799-5694-4
DOI :
10.1109/ESSCIRC.2014.6942080
