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. Author manuscript; available in PMC: 2015 Apr 13.
Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2012;2012:2724–2727. doi: 10.1109/EMBC.2012.6346527

Fig. 2.

Fig. 2

PPG front end with forward biased photo-diodes. The forward diode current IF subtracts a static amount of photocurrent from Iph, which increases the dynamic range of the front end.