A remotely powered implantable IC for recording mouse local temperature with ±0.09 °C accuracy

Multiple techniques are presented to implement an ultra-low-power remotely powered implantable system. The temperature is monitored locally by a thermistor-type sensor. The resistive response of the sensor is amplified and resolved in the time-domain. The data is transmitted using a duty cycled free...

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Bibliographic Details
Published in2013 IEEE Asian Solid-State Circuits Conference (A-SSCC) pp. 93 - 96
Main Authors Ghanad, Mehrdad A., Green, Michael M., Dehollain, Catherine
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2013
Subjects
Accuracy
Oscillators
Regulators
Resistance
Temperature measurement
Temperature sensors
Transmitters
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Summary:Multiple techniques are presented to implement an ultra-low-power remotely powered implantable system. The temperature is monitored locally by a thermistor-type sensor. The resistive response of the sensor is amplified and resolved in the time-domain. The data is transmitted using a duty cycled free running oscillator operating at 868 MHz. In addition, the sensor interface and data transmitter are time interleaved to improve power link sensitivity. A prototype chip is fabricated in 0.18 μm CMOS. The implant is powered with a 13.56 MHz inductive link and operates with a minimum power of 53 μW. The system is capable of recording temperature with accuracy of ±0.09 °C when 8 times oversampling is done at the base station.
ISBN:1479902772
9781479902774
DOI:10.1109/ASSCC.2013.6690990