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A Geiger-mode avalanche photodiode (GM-APD) photon counting system is presented in this letter. The system provides a maximum counting rate of 35 Mcounts/s and is capable of directly displaying the counting rate and data logging to a PC. In this system, the detector can be easily changed to enhance its usefulness in different applications. A novel active quench and reset integrated circuit (AQR-IC)...
An integrated active quench and reset circuit (AQRC) for accurately controlling the hold-off time in Geigermode avalanche photodiodes (GM-APDs) is designed. The circuit was fabricated using a conventional 0.15 μm CMOS process and evaluated using a packaged GM-APD. Experimental results show that the hold-off time can be precisely varied from nanoseconds to microseconds. This allows for selection of...
A high-resolution hold-off time control circuit for Geiger-mode avalanche photodiodes (GM-APDs) that enables linear changes to the hold-off time from several nanoseconds to microseconds is presented. The resolution of the hold-off time can be varied from nanoseconds to tens of nanoseconds with a range up to 1.2 µs to cater for a variety of GM-APDs. This circuit allows setting of the optimal ‘afterpulse-free’...
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