Design of an Electronic Interface for Single-Photon Avalanche Diodes

Area of Science:

• Photonics and Optoelectronics
• Semiconductor Devices

Background:

• Single-photon avalanche diodes (SPADs) are crucial for detecting single photons but are limited by dead time after each detection event.
• This dead time restricts their efficiency in high-frequency applications.
• Existing SPAD designs face challenges with dark current, photon detection probability, and power dissipation.

Purpose of the Study:

• To investigate an electronic interface for reducing the dead time of SPADs.
• To improve the photon detection efficiency of SPADs in high-frequency scenarios.
• To analyze the impact of electronic design on SPAD performance.

Main Methods:

• Developed an electronic interface utilizing pole-zero compensation to minimize SPAD dead time.
• Designed and fabricated a nanosecond pulse generator for testing.
• Varied compensation capacitance to observe its effect on quenching and recovery times.

Main Results:

• The quenching time constant (τq) was largely unaffected by compensation capacitance but showed a 30% increase due to the operational amplifier (op-amp).
• Recovery time was significantly reduced by adjusting compensation capacitance, decreasing from 927.3 ns to as low as 9.8 ns.
• Experimental results with an SPAD and the electronic interface closely matched theoretical predictions.

Conclusions:

• The developed electronic interface effectively reduces SPAD dead time, particularly recovery time.
• Pole-zero compensation is a viable technique for enhancing SPAD performance in high-frequency applications.
• The interface shows promise for improving the overall efficiency of single-photon detection systems.