Which of the following is not true? In building the Photoplethysmography (PPG),

Question

Which of the following is not true?

In building the Photoplethysmography (PPG), photodiode works in the reverse biased mode.

Photoconductive cells can be used to measure radiation. The resistance of photoconductive cells is light dependent. In order to measure radiation through photoconductive cell, we need to supply external power and then measure the resistance of the photoconductive cell.

photovoltaic sensors can be used to detect radiation. Photovoltaic light sensor will generate DC electric voltage/current upon light radiation. To measure the light, we can directly amplify the voltage generated from the photovoltaic sensor and set up relationship between the output voltage and the light intensity.

In building the Photoplethysmography (PPG), photodiode works in the forward biased mode.

In building the Photoplethysmography (PPG), photodiode works in the reverse biased mode.

Photoconductive cells can be used to measure radiation. The resistance of photoconductive cells is light dependent. In order to measure radiation through photoconductive cell, we need to supply external power and then measure the resistance of the photoconductive cell.

photovoltaic sensors can be used to detect radiation. Photovoltaic light sensor will generate DC electric voltage/current upon light radiation. To measure the light, we can directly amplify the voltage generated from the photovoltaic sensor and set up relationship between the output voltage and the light intensity.

In building the Photoplethysmography (PPG), photodiode works in the forward biased mode.

Explanation / Answer

d). it is not true as the photodiode used in ppg works in reverse bias. It is in reverse bias so that the photo current generated by incident light discharges its capacitance through out High-Z impedance.

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