Receiver for inductively coupled communication with an implantable sensor
Publikationstyp
Conference Paper
Date Issued
2011-03
Sprache
English
Institut
Start Page
1
End Page
5
Citation
4th International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL '11
Contribution to Conference
Publisher DOI
Scopus ID
Publisher
Association for Computing Machinery (ACM)
ISBN of container
978-1-4503-0913-4
A clinically approved receiver/interrogator design to establish a wireless link to a sensor module implanted inside the human body is presented. The module is powered by a low frequent magnetic field from the outside and data are transmitted via the inductive link. The receiver is able to detect load shift keying by the sensor module down to a modulation index of 10 -4. It includes a digitally configured automatic gain control with a dynamic range of 48 dB, using the three amplifiers integrated in the microcontroller. This enables software based gain control for optimum signal level adjustment before digitalization. Data reception is improved by using a digital matched filter with very low computational effort. Additionally, this filter suppresses the carrier frequency and all harmonics, which improves sensitivity. The circuit has been implemented using standard components and can be used in passive sensor networks for implants and similar applications.
Subjects
active implant
fracture healing
inductive link
instrumented implant
load shift keying
matched filter
near field communication
receiver
DDC Class
004: Informatik
600: Technik
620: Ingenieurwissenschaften