Photo detector systems and methods of operating same

A dynamic photodiode comprising:

• a substrate;
• a first doped region disposed on the substrate, the first doped region including a first contact configured to receive a first voltage;
• a second doped region disposed on the substrate, the second doped region including a second contact configured to receive a second voltage;
• a first resettable doped region disposed on the substrate between the first doped region and the second doped region, the first resettable doped region including a first resettable contact configured to receive a reset voltage or be set as an open circuit;
• a fourth doped region disposed on the substrate, the fourth doped region including a fourth contact configured to receive the first voltage;
• and
• a first light absorbing region disposed on the substrate between the first doped region and the second doped region, the first light absorbing region configured to generate first electron-hole pairs in the substrate,
• wherein first electron-hole pairs are generated in the substrate when the first resettable contact is set as an open circuit, and the first electron-hole pairs are removed from the substrate when the first resettable contact receives the reset voltage.

A dynamic photodiode comprising:

• a substrate;
• a first doped region disposed on the substrate, the first doped region including a first contact configured to receive a first voltage;
• a second doped region disposed on the substrate, the second doped region including a second contact configured to receive a second voltage;
• a first resettable doped region disposed on the substrate between the first doped region and the second doped region, the first resettable doped region including a first resettable contact configured to receive a reset voltage or be set as an open circuit;
• and
• a first light absorbing region disposed on the substrate between the first doped region and the second doped region, the first light absorbing region configured to generate first electron-hole pairs in the substrate,
• wherein first electron-hole pairs are generated in the substrate when the first resettable contact is set as an open circuit, and the first electron-hole pairs are removed from the substrate when the first resettable contact receives the reset voltage;
• wherein the first doped region surrounds the first resettable doped region.

A dynamic photodiode comprising:

• a substrate;
• a first doped region disposed on the substrate, the first doped region including a first contact configured to receive a first voltage;
• a second doped region disposed on the substrate, the second doped region including a second contact configured to receive a second voltage;
• a first resettable doped region disposed on the substrate between the first doped region and the second doped region, the first resettable doped region including a first resettable contact configured to receive a reset voltage or be set as an open circuit;
• a first light absorbing region disposed on the substrate between the first doped region and the second doped region, the first light absorbing region configured to generate first electron-hole pairs in the substrate;
• an epi-layer disposed underneath the first doped region, the second doped region, the first resettable doped, and the first light absorbing region, and
• a buried oxide region disposed underneath the epi-layer, the buried oxide region contacting the substrate,
• wherein first electron-hole pairs are generated in the substrate when the first resettable contact is set as an open circuit, and the first electron-hole pairs are removed from the substrate when the first resettable contact receives the reset voltage.