Title :
An adaptively RF-powered wireless batteryless in vivo EKG and core body temperature sensing microsystem for untethered genetically engineered mice real-time monitoring
Author :
Chaimanonart, Nattapon ; Young, Darrin J.
Author_Institution :
Electr. Eng. & Comput. Sci. Dept., Case Western Reserve Univ., Cleveland, OH, USA
Abstract :
An adaptively RF-powered, wireless, batteryless, and implantable electrocardiogram (EKG) and core body temperature sensing microsystem for untethered genetically engineered mice real-time monitoring is designed, implemented, and in vivo characterized. A packaged microsystem exhibits a total size of 9 mm × 7 mm × 3 mm and a weight of 400 mg including a pair of stainless steel EKG electrodes. A low power 2 mm × 2 mm ASIC consisting of an EKG amplifier, a proportional-to-absolute temperature (PTAT) temperature sensor, an RF power sensing circuit, an RF-DC power converter, an 8-bit analog-to-digital converter (ADC), digital control circuitry, and a wireless data transmitter is powered by an adaptively controlled external RF energy source at 4 MHz to ensure a stable on-chip 2 V supply with 156 ¿A DC current for the overall microsystem operation.
Keywords :
CMOS integrated circuits; analogue-digital conversion; application specific integrated circuits; bioMEMS; biomedical electrodes; biomedical electronics; electrocardiography; microsensors; power convertors; stainless steel; telemedicine; temperature sensors; transmitters; wireless sensor networks; ASIC; EKG amplifier; RF power sensing circuit; RF-DC power converter; RF-powered wireless batteryless in vivo EKG; analog-to-digital converter; core body temperature sensing microsystem; current 156 muA; digital control circuitry; frequency 4 MHz; implantable electrocardiogram; mass 400 mg; proportional-to-absolute temperature sensor; size 2 mm; size 3 mm; size 7 mm; size 9 mm; stainless steel EKG electrodes; storage capacity 8 bit; untethered genetically engineered mice real-time monitoring; voltage 2 V; wireless data transmitter; Analog-digital conversion; Circuits; Genetic engineering; In vivo; Mice; Monitoring; Packaging; Radio frequency; Temperature sensors; Wireless sensor networks; Biomedical Implant; EKG Sensor; RF Powering; Telemetry; Temperature Sensor; Wireless Sensing;
Conference_Titel :
Networked Sensing Systems (INSS), 2009 Sixth International Conference on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
978-1-4244-6313-8
Electronic_ISBN :
978-1-4244-6314-5
DOI :
10.1109/INSS.2009.5409952
