Single photon avalanche diode front-end circuit with multi-mode detection

By using a single circuit structure composed of basic electronic components in the front-end circuit of a single-photon avalanche diode, flexible switching between synchronous gating and asynchronous free operation modes is achieved, solving the problems of high complexity and large area occupation in the existing technology, improving detection performance and stability, and making it suitable for large-scale SPAD arrays and three-dimensional imaging detection.

CN122151038APending Publication Date: 2026-06-05FUDAN UNIVERSITY
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Patent Information

Application Number
CN202610619412.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-08
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing single-photon avalanche diode front-end circuits are difficult to switch operating modes flexibly in complex and ever-changing operating environments, resulting in unstable detection performance. Furthermore, existing switching methods increase circuit area and complexity, making it difficult to adapt to multi-modal detection requirements.

Method used

A single circuit structure composed of basic electronic components enables flexible switching between synchronous gating mode and asynchronous free operation mode, and shares a quenching path. Adjustable delay and self-reset module are realized through inverting transistors, simplifying control logic and reducing power consumption and area occupation.

Benefits of technology

It achieves high efficiency adaptability in different detection scenarios, reduces circuit area and power consumption, improves system stability and detection performance, and is suitable for large-scale SPAD array and three-dimensional imaging detection integrated applications.

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Abstract

The invention relates to a multi-mode detection single photon avalanche diode front-end circuit. The front-end circuit is integrated with a quenching, delay control and self-resetting module composed of a basic MOS tube, an inverter and a logic gate. A controller outputs three paths of control signals to carry out mode configuration: in a synchronous gating mode, the on-off of related MOS (Metal Oxide Semiconductor) tubes is controlled in sequence to work in a gating mode; and in the asynchronous free operation mode, the related control level is fixed, and the reset delay is linearly controlled by adjusting the third path of control signal. According to the invention, a single circuit structure is adopted to realize dual-mode detection, a core quenching path is shared, and the dual-mode detection circuit has the advantages of small area, low power consumption and wide adjustable range of dead time, and is suitable for large-scale SPAD array integration.
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