DC biased input stage with differential photocurrent sensing for VLC front-ends

Basha, Majed and Binns, Richard (2017) DC biased input stage with differential photocurrent sensing for VLC front-ends. In: ICCSS 2017 - International Conference on Circuits, System and Simulation, 14-17 July 2017, London, UK.

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Official URL: http://doi.org/10.1109/CIRSYSSIM.2017.8023204


The reverse bias voltage across the PIN photodiode is essential for the photodiode to operate in the photoconductive mode. This paper presents an input bias stage with differential photocurrent sensing for VLC front-ends. The bias voltage is provided from within the transimpedance amplifier’s (TIA) circuit eliminating the need of external bias voltage. The amount of bias voltage could be optimised according to the photodiode required sensitivity and capacitance. The differential configuration makes the TIA immune to any common mode noise. The proposed method is applied to a hypothetical TIA and results are compared with single ended structure. Simulation results showed that using this approach it is possible to achieve a transimpedance gain of 120 dBΩ over a maximum bandwidth of 14.5 MHz with a common mode rejection ratio of 61 dB while the circuit provides a controlled bias voltage of up to 6 V across the PIN photodiode eliminating the need for external bias voltage source.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: positive-intrinsic-negative, PIN, transimpedance amplifier, TIA, visible light communications, VLC
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Dr Richard Binns
Date Deposited: 18 Dec 2017 10:01
Last Modified: 01 Aug 2021 07:21
URI: http://nrl.northumbria.ac.uk/id/eprint/32876

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