Kassem, A;
Darwazeh, I;
(2022)
Equivalent Circuit Model for Large-Area Photodiodes for VLC Systems.
In:
Proceedings of the 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP) 2022.
(pp. pp. 467-472).
IEEE
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Abstract
An equivalent circuit model for large-area PIN photodiodes used in visible light communication (VLC) applications is described. The modelling aims to gain insight into the effect of the photodiode intrinsic elements on the bandwidth of VLC receivers. The model parameters are extracted based on impedance measurements of two commercially available large-area PIN photodiodes. The extracted model parameters identify the photodiode series resistance as a major contributor to the bandwidth limitation of VLC receivers, especially when employing low input impedance transimpedance amplifiers (TIAs). However, such resistance is commonly ignored by most circuit designers, since it is assumed to have a negligible effect on the TIA performance. To demonstrate the accuracy of the photodiode equivalent circuit model, a design example of a low input impedance regulated cascode (RGC) TIA is described. The TIA is constructed using discrete components and a printed circuit board (PCB). The designed RGC TIA is measured using the proposed photodiode equivalent model versus a simplified model. In addition, a VLC link is constructed to measure the optoelectrical response of the large-area photodiode with the RGC TIA. The RGC frequency response measurements obtained from the full and simplified photodiode equivalent model are contrasted to the optoelectrical response, which verified that, unlike the simplified photodiode model, the proposed photodiode equivalent model can accurately predict the bandwidth performance of the VLC receiver.
| Type: | Proceedings paper |
|---|---|
| Title: | Equivalent Circuit Model for Large-Area Photodiodes for VLC Systems |
| Event: | The 13th International Symposium on Communication Systems, Networks and Digital Signal Processing (CSNDSP) 2022 |
| Location: | Porto, Portugal |
| Dates: | 20th-22nd July 2022 |
| ISBN-13: | 9781665410441 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/CSNDSP54353.2022.9908056 |
| Publisher version: | https://doi.org/10.1109/CSNDSP54353.2022.9908056 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | photodiodes, optical receivers, visible light communications |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10161166 |
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