Kassem, A;
Darwazeh, I;
(2022)
Practical Demonstration of RGC and Modified RGC TIAs for VLC systems.
In:
2021 28th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2021 - Proceedings.
IEEE: Dubai, United Arab Emirates.
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Abstract
This work reports a modified regulated cascode (RGC) transimpedance amplifier (TIA) with tolerance to the ultra-high photodiode capacitances encountered in visible light communication systems. The new design is proposed to ameliorate internal miller capacitance limiting effects, inherent in traditional RGC designs through the use of a cascode circuit within the RGC. The paper introduces the design principle of the proposed RGC and presents derivation of tractable mathematical equations for describing the operation. The bandwidth advantage of the new design is shown through comparing the operation of the modified circuit to the traditional one using full circuit simulations. The paper presents full circuit designs, based on discrete components and printed circuit board (PCB) construction of both circuits and contrasts their operation, experimentally demonstrating bandwidth advantage for different values of photodiode capacitances and amplifier transimpedance gain values. Measurements show that using the modified RGC TIA results in a bandwidth improvement of over 200 % relative to the conventional RGC design, achieving a bandwidth of 200 MHz at 2mathrm{K} transimpedance gain with a 300 pF photodiode capacitance. As such, this is one of the highest bandwidths reported for such high capacitances, to-date.
| Type: | Proceedings paper |
|---|---|
| Title: | Practical Demonstration of RGC and Modified RGC TIAs for VLC systems |
| Event: | 2021 28th IEEE International Conference on Electronics, Circuits, and Systems (ICECS) |
| Dates: | 28 Nov 2021 - 1 Dec 2021 |
| ISBN-13: | 9781728182810 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/ICECS53924.2021.9665505 |
| Publisher version: | http://dx.doi.org/10.1109/ICECS53924.2021.9665505 |
| 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: | Optical receiver, regulated cascode, transimpedance amplifier, visible light communication |
| UCL classification: | 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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10146393 |
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