This paper presents a design methodology for an optimization of the optical receiver in a neural recording system. In the transcutaneous optical telemetric link (TOTL) system, light/tissue interaction produces significant scattering of the transmitted photons. Therefore, in order to increase the transmission efficiency, it is in principle advantageous to use a photodiode with a larger size to collect more scattered photons. The photodiode size, however, is limited by the bandwidth requirement. In this paper, we derive a mathematical expression of the maximum photodiode size in the presence of constraints imposed by its bias voltage and the receiver bandwidth. A numerical example using real-world TOTL system parameters is given to demonstrate the design methodology. The trade off between transmission efficiency, noise and inter-symbol interference (ISI) in terms of the 3-dB bandwidth of the receiver is investigated. To this end, receivers with bandwidth about 4/3, 3/3, 2/3 and 1/3 of the data rate are compared with respect to the sensitivity. It was found that the receiver bandwidth of 2/3 of the data rate achieves the highest sensitivity for thin tissue (2 mm) and that a receiver bandwidth of 1/3 of the data rate is preferable for thicker tissues (5 and 8 mm).
%0 Conference Paper
%1 6679710
%A Liu, T.
%A Anders, J.
%A Ortmanns, M.
%B 2013 IEEE Biomedical Circuits and Systems Conference (BioCAS)
%D 2013
%K optical link from:jens.anders
%P 346-349
%R 10.1109/BioCAS.2013.6679710
%T Design optimization of the optical receiver in transcutaneous telemetric links
%U https://ieeexplore.ieee.org/document/6679710/
%X This paper presents a design methodology for an optimization of the optical receiver in a neural recording system. In the transcutaneous optical telemetric link (TOTL) system, light/tissue interaction produces significant scattering of the transmitted photons. Therefore, in order to increase the transmission efficiency, it is in principle advantageous to use a photodiode with a larger size to collect more scattered photons. The photodiode size, however, is limited by the bandwidth requirement. In this paper, we derive a mathematical expression of the maximum photodiode size in the presence of constraints imposed by its bias voltage and the receiver bandwidth. A numerical example using real-world TOTL system parameters is given to demonstrate the design methodology. The trade off between transmission efficiency, noise and inter-symbol interference (ISI) in terms of the 3-dB bandwidth of the receiver is investigated. To this end, receivers with bandwidth about 4/3, 3/3, 2/3 and 1/3 of the data rate are compared with respect to the sensitivity. It was found that the receiver bandwidth of 2/3 of the data rate achieves the highest sensitivity for thin tissue (2 mm) and that a receiver bandwidth of 1/3 of the data rate is preferable for thicker tissues (5 and 8 mm).
@inproceedings{6679710,
abstract = {This paper presents a design methodology for an optimization of the optical receiver in a neural recording system. In the transcutaneous optical telemetric link (TOTL) system, light/tissue interaction produces significant scattering of the transmitted photons. Therefore, in order to increase the transmission efficiency, it is in principle advantageous to use a photodiode with a larger size to collect more scattered photons. The photodiode size, however, is limited by the bandwidth requirement. In this paper, we derive a mathematical expression of the maximum photodiode size in the presence of constraints imposed by its bias voltage and the receiver bandwidth. A numerical example using real-world TOTL system parameters is given to demonstrate the design methodology. The trade off between transmission efficiency, noise and inter-symbol interference (ISI) in terms of the 3-dB bandwidth of the receiver is investigated. To this end, receivers with bandwidth about 4/3, 3/3, 2/3 and 1/3 of the data rate are compared with respect to the sensitivity. It was found that the receiver bandwidth of 2/3 of the data rate achieves the highest sensitivity for thin tissue (2 mm) and that a receiver bandwidth of 1/3 of the data rate is preferable for thicker tissues (5 and 8 mm).},
added-at = {2020-10-12T15:50:29.000+0200},
author = {{Liu}, T. and {Anders}, J. and {Ortmanns}, M.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/24186242fde3a8aa4164fa0ed9dfafe11/iis},
booktitle = {2013 IEEE Biomedical Circuits and Systems Conference (BioCAS)},
doi = {10.1109/BioCAS.2013.6679710},
interhash = {4eb91cdf47a9db2320d2e0e520baa089},
intrahash = {4186242fde3a8aa4164fa0ed9dfafe11},
issn = {2163-4025},
keywords = {optical link from:jens.anders},
month = oct,
pages = {346-349},
timestamp = {2020-10-12T13:50:29.000+0200},
title = {Design optimization of the optical receiver in transcutaneous telemetric links},
url = {https://ieeexplore.ieee.org/document/6679710/},
year = 2013
}
