11. In an avalanche photodiode the original charge carrier is created by the absorption of a photon. 12. Since the reset transistor is planar fabrication techniques, each photodiode having its own 3T circuit. 13. Other systems connect the spindle to a stroboscope, which alternates light and dark upon a photodiode . 14. A photodiode at the other end of the tube detects the changes of brightness from the light. 15. The absorption of the probe beam is recorded on a photodiode for various frequencies of the beams. 16. This leakage current restricted the photodiode 's use, unless a cooling apparatus was used conjunctively. 17. The 3T pixel comprises the same elements as the 4T pixel except the transfer gate and the photodiode . 18. Photons striking the photodiode are converted into two carriers of electrical charge, called electron-hole pairs. 19. To the bottom right of the mirror is the main photodiode that senses the beam reflected off the disc. 20. Solid-state relays built around MOSFET switches usually employ a photodiode opto-isolator to drive the switch.