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

Majed Basha, Richard Binns

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages167-170
Number of pages4
DOIs
Publication statusPublished - 14 Jul 2017
Event2017 International Conference on Circuits, System and Simulation (ICCSS) - London, United Kingdom
Duration: 14 Jul 201717 Jul 2017

Conference

Conference2017 International Conference on Circuits, System and Simulation (ICCSS)
Period14/07/1717/07/17

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