A Current Mode Array Spad Gain Uniformity Adaptive Control Circuit

Abstract

The invention discloses a current mode array SPAD gain uniformity self-adaptation control circuit. The current mode array SPAD gain uniformity self-adaptation control circuit comprises a public current bias module and a plurality of single-pixel circuits corresponding to the number of SPAD pixel units in the array SPAD, wherein each single-pixel circuit comprises a current monitoring module and anactive quenching module; the current monitoring modules are composed of operational amplifiers and current mirrors, the active quenching modules are composed of comparators and quenching pipes, and used for being triggered to work according to the output voltage signals of the current monitoring modules and controlling the quenching pipes to generate avalanche quenching signals; and the current monitoring modules are composed of the operational amplifiers OPi, the cascode current mirrors composed of PMOS pipe M4_i and PMOS pipe M5_i, and the current mirrors composed of NMOS pipe Mi_L and NMOSpipe Mi_R. A current mode method is adopted to self-adaptively control the reversed bias voltage of SPAD, the problem of gain uniformity of the array SPAD is inhibited, meanwhile the defect that a traditional voltage mode circuit is complex is overcome, and the area and power consumption are reduced.

Description

technical field [0001] The invention relates to a current mode array SPAD gain uniformity adaptive control circuit, which belongs to the technical field of single photon detection. Background technique [0002] Avalanche photodiodes (APDs) have the advantages of small weight, low power consumption, high quantum efficiency, insensitivity to magnetic fields and radiation, and easy integration. Photon Avalanche Photodiode (SPAD). Therefore, the APD-based single-photon detection system has become an important research direction, which can be used in related fields such as lidar three-dimensional imaging, environmental detection, national defense security, and medical detection. [0003] At present, single-photon detectors are developing in the direction of integration, miniaturization, and arraying. Especially with the continuous expansion of array detection applications, higher requirements are placed on the uniformity of detectors. For array SPADs, due to the influence of pr...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the non-linear problem of SPAD detection sensitivity caused by the discreteness of the process, weaken the influence of the non-uniformity of the detector performance parameters, and avoid the traditional voltage mode reverse bias voltage control at the same time. For the problem of complex circuits, a current mode array SPAD gain uniformity adaptive control circuit is provided, which introduces the idea of ​​current mode reverse bias voltage control and realizes the adaptive control of array SPAD gain

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