Dynamic photodiode (DPD)
Traditionally, photodiodes operate at constant reverse biased voltage giving the photocurrent as output. Instead of using DC bias, the DPD operates at pulsed voltages, while the triggering time of output current is measured, which provides a great improvement in the device performance comparable with modern avalanche photodiodes (APDs). However, unlike APD, DPD does not require high voltage for its operation, which makes it eminently suitable for portable applications. Based on standard low cost CMOS technology DPD can be integrated with other CMOS circuits and customized for different applications taking light sensing to the next level in electronics applications.
Advantages of DPD:
- Similar to APD performance, no need of amplifier.
- DPD does not require high voltage; operation voltage is about 1V.
- Built with standard CMOS, DPD can be integrated with other circuits on chip
- Digital output. Since DPD measures triggering time instead of amplitude of output photocurrent, this delay time can be easily transformed into a digital value.
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