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Optical sensor using a floating body SOI MOSFET in the Delta-sigma loop

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Maher Kayal, Jean-Michel Sallese, Louis Harik
2008

Abstract

In this paper, the partially depleted SOI phototransistor has been used as a light intensity sensor. A pixel implementing the technique elaborated in [1] was designed and implemented on SOI technology. The circuit implements a first order Delta-sigma modulator. Measured data show flux densities as low as 3mW/m2 and an SNR of 60 dB. ©2008 IEEE.

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https://infoscience.epfl.ch/entities/publication/4f76ecb8-d594-4e91-9646-589722fe28f3

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Pulse-density modulation, or PDM, is a form of modulation used to represent an analog signal with a binary signal. In a PDM signal, specific amplitude values are not encoded into codewords of pulses of different weight as they would be in pulse-code modulation (PCM); rather, the relative density of the pulses corresponds to the analog signal's amplitude. The output of a 1-bit DAC is the same as the PDM encoding of the signal. In a pulse-density modulation bitstream, a 1 corresponds to a pulse of positive polarity (+A), and a 0 corresponds to a pulse of negative polarity (−A).

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