SPAD array suitable for long-distance distance measurement
A long-distance, array technology, applied in the field of integrated chip detectors in the field of long-distance ranging, can solve problems such as limiting the response bandwidth, and achieve the effect of reducing quantization error, simple circuit structure and signal processing, and improving bandwidth
Active Publication Date: 2020-06-19
NANJING UNIV
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Therefore, the output signal of SiPM is an analog quantity proportional to the number of avalanche units, and the backend needs to be sampled through analog-to-digital conversion, but the analog-to-digital conversion process limits the response bandwidth and inevitably introduces various noises
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[0018] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.
[0019] figure 1 It is a schematic diagram of the 3×3 SPAD array structure proposed by the present invention. The small box shown in the dotted line box in the figure represents a single SPAD detection unit 101, and the SPAD detection unit 101 includes a SPAD device and corresponding quenching circuit and shaping circuit . The SPAD detection unit 101 outputs a digital signal "1" with a fixed pulse width (for example, 10 ns), and the corresponding signal is "0" when there is no signal under the fixed pulse width. The dashed box in the figure represents the SPAD detection array 102, and the detection array 102 is composed of 9 mutually independent SPAD detection units 101, w...
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The invention discloses an SPAD array suitable for long-distance distance measurement. The array comprises an m*n SPAD detection array composed of a plurality of SPAD detection units, a D trigger circuit and a digital logic operation circuit, wherein the digital logic operation circuit comprises a full adder and a half adder; the output end of the SPAD detection unit is connected with the D trigger circuit, and the D trigger circuit is used for carrying out clock synchronization on output signals of the SPAD detection unit; the output end of a D trigger is connected with the multi-stage full adder and the half adder; and the digital logic operation circuit accumulates the digital signals output by the SPAD detection units, and finally outputs a binary number with a value range of 0-m*n ina clock period to represent the number of the SPAD detection units which respond to the binary number. According to the SPAD array, the signal output circuit is completely digitalized, the circuit structure is simple, on-chip integration is facilitated, and the SPAD array can be used for high-precision long-distance distance measurement.
Description
technical field [0001] The invention relates to the integrated circuit field of a single-photon avalanche diode detector array, in particular to an integrated chip detector suitable for the field of long-distance ranging. Background technique [0002] In recent years, the field of laser ranging is in a period of vigorous development. As a relatively mature ranging system, TOF laser ranging technology can achieve long-distance and high-precision measurement, and its data processing process is relatively simple, avoiding time delay. . TOF three-dimensional ranging technology uses laser as an active light source to record the time from the launch of the laser to the target object and the time reflected from the target object to the detector, and calculate the distance information of the target object through the flight time of the light pulse back and forth. [0003] In the existing TOF ranging technology, the detector mostly uses Avalanche Photon Diode (APD), but after the AP...
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Login to View More IPC IPC(8): G01S17/32G01S7/4865
CPCG01S17/08G01S7/4863
Inventor 闫锋杨雄毛成孔祥顺
Owner NANJING UNIV