A Remotely Powered Implantable IC for Recording Mouse Local Temperature with +/- 0.09 degrees 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 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 mu m CMOS. The implant is powered with a 13.56 MHz inductive link and operates with a minimum power of 53 mu W. The system is capable of recording temperature with accuracy of +/- 0.09 degrees C when 8 times oversampling is done at the base station.

Published in:
Proceedings Of The 2013 Ieee Asian Solid-State Circuits Conference (A-Sscc), 93-96
Presented at:
9th IEEE Asian Solid-State Circuits Conference (A-SSCC), Singapore, SINGAPORE, NOV 11-13, 2013
New York, Ieee
978-1-4799-0277-4; 978-1-4799-0280-4

 Record created 2014-06-02, last modified 2018-01-28

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