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Bias current value detection circuit, single photon detector strong light attack detection circuit and method thereof

A single-photon detector and detection circuit technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve problems such as inapplicability, and achieve the effect of accurate bias current detection

Active Publication Date: 2019-03-15
QUANTUMCTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of the special chip for APD bias current detection is that it cannot be used in the environment where the APD bias voltage is negative high voltage.

Method used

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  • Bias current value detection circuit, single photon detector strong light attack detection circuit and method thereof
  • Bias current value detection circuit, single photon detector strong light attack detection circuit and method thereof

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Embodiment 1

[0021] The detection circuit of Embodiment 1 of the present invention is a detection circuit that accurately detects the bias current value of the avalanche photodiode (that is, the APD tube) in real time, such as figure 1 As shown, it is used to detect the bias current value of the avalanche photodiode 1 when the avalanche photodiode 1 is in the avalanche state. APD tubes can be domestic or imported products, and are not limited to APD tubes with single-photon detection performance.

[0022] The detection circuit includes a current sensor 2 , a current source 3 , an AD conversion circuit 4 , a resistor R1 , a resistor R2 , a resistor R3 , and a DA conversion circuit 5 .

[0023] On the one hand, the inverting terminal of the current sensor 2 is electrically connected to the anode of the avalanche photodiode 1, on the other hand, it is electrically connected to the non-inverting terminal of the current sensor 2 through the resistor R1, and on the other hand, it is electrically...

Embodiment 2

[0029]Embodiment 2 of the present invention provides a strong light attack detection circuit for a single photon detector, which is used to detect the avalanche photodiode 1 when the photoelectric converter used in the single photon detector is the avalanche photodiode 1 and the avalanche photodiode 1 is in an avalanche state Whether it is under a strong light attack, compared with the detection circuit of embodiment 1 that accurately detects the bias current value of the avalanche photodiode in real time, embodiment 2 performs signal processing on the bias current value of the APD tube accurately detected by the AD conversion circuit 4 in real time, thereby judging the avalanche photodiode Whether diode 1 is under strong light attack.

[0030] see figure 2 The single photon detector strong light attack detection circuit is based on the detection circuit for real-time and accurate detection of the bias current value of the avalanche photodiode in embodiment 1, and the data pr...

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Abstract

The invention discloses a bias current value detection circuit, a single photon detector strong light attack detection circuit and a method thereof. The detection circuit is used for detecting the bias current value of an avalanche photodiode when the avalanche photodiode is in an avalanche state. The detection circuit comprises a DA conversion circuit, a current sensor, a current source, an AD conversion circuit and resistors R1 to R3. On the one hand, the inverting end of the current sensor is connected with the anode of the avalanche photodiode, on the other hand, the inverting end of the current sensor is connected with the non-inverting end through a resistor R1 and is grounded through a resistor R2, and the non-inverting end of the current sensor is also electrically connected with the DA conversion circuit; the current sensor is powered by double power supplies, the output end of the current sensor is connected with the current source and the AD conversion circuit after passingthrough a resistor R3, and the signal output end of the AD conversion circuit is used as the signal output end of the whole detection circuit. The double power supplies of the current sensor are all negative voltages and the magnitude of the voltage value depends on the input voltage of the AD conversion circuit being 0 V when no current passes through the resistor R1.

Description

technical field [0001] The invention relates to a detection circuit in the technical field of quantum communication, in particular to a detection circuit and a detection method for accurately detecting the bias current value of an avalanche photodiode in real time, a strong light attack detection circuit for a single photon detector and a detection method thereof. Background technique [0002] The traditional method is to use a PIN photodiode to convert the strong light narrow pulse signal sent by the attacker EVE into a narrow pulse current, and output a narrow pulse voltage proportional to the narrow pulse current, which is recognized by the subsequent main control chip to determine whether there is a strong light attack occur. However, the traditional PIN tube detection method has low sensitivity, poor linearity, and poor accuracy, and cannot accurately measure the APD (Avalanche Photo Diode, avalanche photodiode) bias current value. [0003] At present, Linear has also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26G01R31/265
CPCG01R31/2635G01R31/2656
Inventor 姚维王泉代云启
Owner QUANTUMCTEK