Pulse time compression method for multichannel single-photon avalanche diode detector

Abstract

The invention discloses a pulse time compression method for a multichannel single-photon avalanche diode detector. The method comprises the specific steps that multiple single-photon avalanche diodesform a detection array, all the single-photon avalanche diodes are independent, and a quenching circuit of each single-photon avalanche diode is connected with a pulse time compression circuit; each single-photon avalanche diode generates a wide-pulse signal under the action of the corresponding quenching circuit, and each wide-pulse signal is subject to pulse time compression through the corresponding pulse time compression circuit to generate a narrow-pulse signal; and a bus circuit merges the multiple narrow-pulse signals, obtained after pulse time compression, onto one bus, and the mergedsignals serve as one pixel point to be output externally. Through the method, the problems of signal indistinguishability, signal judgment omission and misjudgment caused by the situation that each channel in dead time of the multichannel single-photon avalanche diode detector occupies the bus for an excessively long time can be effectively avoided, and meanwhile the transmission bandwidth of thesignals on the bus can be increased.

Description

technical field [0001] The invention belongs to the technical field of semiconductor optoelectronics, in particular to a pulse time compression method for a single photon avalanche diode detector. Background technique [0002] As a new type of photodetector, the single-photon avalanche diode has the characteristics of high gain and high sensitivity, and its application prospects are very broad, including lidar technology in the field of unmanned driving, traditional two-dimensional imaging technology, compressed sensing imaging technology, etc. However, in the field of lidar, single photon avalanche diodes are easily affected by noise factors such as dark counts and ambient light when they are used as pixels for detection. An ideal solution is to use multiple single photon avalanche diodes to form a multi-channel detector. ; Similarly, in the application of compressed sensing imaging, multi-channel detectors need to compress the pulse signals generated by the detection of ph...

AI Technical Summary

Problems solved by technology

When multiple single-photon avalanche diodes are compressed into one output signal, the large dead time causes each pulse signal to occupy the bus for too long, and it is easy to confuse multiple signals together and cannot be clearly distinguished

At present, the dead time of ordinary quenching circuits is generally above 10ns; the specially designed quenching circuit can further reduce the dead time, but the circuit structure will be more complicated, and the layout area will be larger, which is not conducive to array integration.

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