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Sine gating detector avalanche signal processing system and processing method

A signal processing and signal processing circuit technology, applied in the field of sinusoidal gating detector avalanche signal processing system, can solve problems such as increased circuit maintenance time, increased circuit cost, unfavorable system integration, etc., to save fault location time and improve performance , the effect of avoiding volume problems

Active Publication Date: 2021-07-16
QUANTUMCTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, using the above figure 2 The avalanche signal processing circuit of the method is large in size because it is built with many discrete devices, especially the filter in it. In order to achieve a higher frequency gain roll-off speed, a multi-stage filter cascade is usually used form; and the realization of the required high-speed broadband amplifier needs to add peripheral devices on the PCB, there are certain circuit parasitic effects, and the volume problem will become more obvious when multiple channels are required, which will increase the cost of the circuit, which is not conducive to the system integration; at the same time, due to the large number of components required by the filter, its consistency and stability problems are more obvious, and increase the maintenance time when the circuit fails; The circuit board is designed with a special shielding cavity to reduce electromagnetic interference

Method used

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  • Sine gating detector avalanche signal processing system and processing method
  • Sine gating detector avalanche signal processing system and processing method
  • Sine gating detector avalanche signal processing system and processing method

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Embodiment 1

[0034] Such as Figure 4 As shown, a sinusoidal gated detector avalanche signal processing system is used to process the output signal of the single photon avalanche diode in the sinusoidal gated detector.

[0035] The sinusoidal gated detector includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2 and a single photon avalanche diode SPAD, one end of the first resistor R1 is connected to the first One end of the capacitor C1, the other end of the first resistor R1 is grounded, and one end of the second resistor R2 is connected to the power supply V Bias , the other end of the second resistor R2 is connected to the cathode of the single photon avalanche diode SPAD, the anode of the single photon avalanche diode SPAD is connected to one end of the third resistor R3, the other end of the third resistor R3 is grounded, and the first capacitor C1 The other end is connected to the connection line between the second resis...

Embodiment 2

[0043] The difference between Embodiment 2 of the present invention and Embodiment 1 lies in that: a plurality of pads (not shown in the figure) are arranged under the RDL substrate 1 .

[0044] The sinusoidal gated detector avalanche signal processing system further includes a packaging case (not shown) coated with a shielding material, and the avalanche signal processing module and the RDL substrate 1 are packaged in the packaging case. Preferably, the shielding material is metal.

[0045] In a specific implementation of Example 2 of the present invention, the metal shielding material is any one of copper foil, aluminum foil, or PUE-2R liquid energy absorbing coating.

[0046] The working process and principle of the embodiment of the present invention 2 are:

[0047] The avalanche signal processing system forms a standard quasi-chip module by arranging pads under the redistribution layer substrate 1 . By encapsulating the avalanche signal processing system in a package sh...

Embodiment 3

[0049] The difference between Embodiment 3 of the present invention and Embodiment 1 is that the gain matching circuit AT is a micro-packaged 50 ohm π-type attenuator circuit, which can further reduce the occupied area of ​​the device and is beneficial to system integration.

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Abstract

The invention discloses a sine gating detector avalanche signal processing system and a processing method. The system is used for processing an output signal of a single photon avalanche diode in a sine gating detector, and comprises a sine gating detector avalanche signal processing circuit. A band elimination filter of the sine gating detector avalanche signal processing circuit is formed by cascading multiple stages of microstrip line filters, the multiple stages of microstrip line filters are directly printed on a redistribution layer substrate, and other devices of the sine gating detector avalanche signal processing circuit are packaged on the redistribution layer substrate. The system has the advantages that the microstrip line band elimination filter is adopted, the microstrip line band elimination filter is directly arranged in the redistribution layer substrate, and other circuit device parts are interconnected on the substrate so that the size is reduced; and the problems of a volume, cost, stability and consistency caused by the use of numerous passive devices are avoided, and the system performance is improved.

Description

technical field [0001] The invention relates to the fields of single photon detection and quantum secure communication, and more specifically relates to a sinusoidal gate detector avalanche signal processing system and processing method. Background technique [0002] Quantum secure communication achieves the transfer of quantum states by transmitting single photons or entangled photons, thereby completing quantum secure communication. At present, quantum communication technology based on single photon realization usually refers to Quantum Key Distribution (QKD, QuantumKey Distribution) technology. In principle, any eavesdropping on the QKD process will inevitably be discovered. Therefore, the key generated by the QKD process has theoretical unconditional security. In the process of realizing such an important technology, single photon detection technology is one of the indispensable and important technologies. Single photon detection technology is widely used in quantum ke...

Claims

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Application Information

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IPC IPC(8): G01J1/44
CPCG01J1/44G01J2001/442G01J2001/4466G01J2001/444Y02P70/50
Inventor 王泉蒋连军唐世彪蒋伟骆皓月
Owner QUANTUMCTEK