DocumentCode :
2919680
Title :
Robust power oscillator design for inductive-power link applications
Author :
Ma, Qingyun ; Haider, Mohammad Rafiqul ; Massoud, Yehia
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Alabama at Birmingham, Birmingham, AL, USA
fYear :
2011
fDate :
11-14 Dec. 2011
Firstpage :
109
Lastpage :
112
Abstract :
Microelectronic devices are widely used in biomedical applications such as infusion pumps, artificial organs, dialysis machines, cochlear and dental implants, etc. For continuous operation of implantable medical devices, the implanted units need to be powered up from an external source. Use of implantable batteries poses potential battery fluid leakage and biohazard. Unlike the batteries, wireless power transmission shows better promises for implanted micro devices. Previously reported differential cross-coupled power oscillator based scheme showed more than 90% link efficiency designed in a 0.5-μm standard CMOS process. However, the variation of mutual coupling between the link coils affects the resonance condition and lowers the power-added efficiency of the power oscillator. To make the power oscillator robust, injection-locking mechanism is incorporated with the differential power oscillator. The new injection-locked differential oscillator can lock the frequency with the variation of coupling coefficient by injecting weak differential current signals. Simulation results indicate that with the injection-locking, the oscillation frequency and the power-added efficiency are improved by 4.18% and 24.4%, respectively compared to the regular power oscillator structure for a coupling coefficient of 0.4.
Keywords :
CMOS analogue integrated circuits; artificial organs; cochlear implants; inductive power transmission; injection locked oscillators; prosthetic power supplies; artificial organ; battery fluid leakage; biomedical application; cochlear; dental implant; dialysis machine; differential cross-coupled power oscillator based scheme; efficiency 24.4 percent; efficiency 4.18 percent; implantable battery; implantable medical microdevice; inductive-power link application; infusion pump; injection-locked differential power oscillator; injection-locking mechanism; microelectronic device; mutual coupling; power-added efficiency; size 0.5 mum; standard CMOS process; weak differential current signal; wireless power transmission; Coils; Couplings; Phase noise; Power transmission; RLC circuits; Resonant frequency;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2011 18th IEEE International Conference on
Conference_Location :
Beirut
Print_ISBN :
978-1-4577-1845-8
Electronic_ISBN :
978-1-4577-1844-1
Type :
conf
DOI :
10.1109/ICECS.2011.6122226
Filename :
6122226
Link To Document :
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