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Active imaging readout circuit working on linear mode APD (Avalanche Photo Diode) array

An APD array, linear mode technology, used in TV, electrical components, color TV and other directions, can solve the problems of complex circuit modules, unfavorable integrated circuit signal processing, etc., and achieve simple circuit structure, high uniformity, and improved distance resolution. Effect

Inactive Publication Date: 2012-10-03
SOUTHEAST UNIV
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  • Description
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Problems solved by technology

For example, the Chinese patent (patent publication number: CN 1384371A) proposes a high-precision laser rangefinder device, which includes modules such as a signal receiving circuit, a peak hold circuit, an integrating circuit, and a high-voltage power supply circuit, and the circuit modules are complex, which is not conducive to Integrated circuits for signal processing

Method used

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  • Active imaging readout circuit working on linear mode APD (Avalanche Photo Diode) array
  • Active imaging readout circuit working on linear mode APD (Avalanche Photo Diode) array
  • Active imaging readout circuit working on linear mode APD (Avalanche Photo Diode) array

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Embodiment

[0037] The circuit working process of the present invention taking the segmented ranging method as an example is as follows (the output of the voltage holding circuit to buffer 1):

[0038] When the second clock G1 is at low level, N6 is cut off, , the photocurrent is integrated on the integrating capacitor C1 to generate a 2D related voltage value. When the distance measurement is large, G1 is high level, N6 is turned on, , Generate a large optical signal current, the optical signal current is transmitted to the injection circuit, and the injection circuit will quickly generate a potential drop at the output end. The increase in current ensures that the time for the potential to drop is short enough. N6 can be composed of multiple tubes. As the distance increases, the current flowing through N6 increases, which can improve the distance resolution within a large detection distance range.

[0039] If the intensity is measured, it will be output through the injection circ...

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Abstract

The invention provides an active imaging readout circuit working on a linear mode APD (Avalanche Photo Diode) array. The circuit is provided with a probe, a high voltage protective circuit, an injecting circuit, a comparator and a voltage retaining circuit; the output of the probe is connected with the input of the high voltage protective circuit; the output of the high voltage protective circuit is connected with the input of the injecting circuit; the output of the injecting circuit is connected with the input of the comparator circuit; the output of the comparator circuit is connected with the input of the high voltage retaining circuit; the output of the voltage protective circuit is connected with the injecting circuit and a subsequent processing buffer circuit; and the output of the injecting circuit is further connected with the subsequent processing buffer circuit.

Description

technical field [0001] The invention relates to photoelectric imaging technology, in particular to an active imaging readout circuit working in a linear mode APD array. It belongs to the technical field of microelectronics and optoelectronics. Background technique [0002] In recent decades, due to the development of charge-coupled devices (CCD), CMOS image sensors and infrared imaging devices, photoelectric imaging technology has been widely used in many fields including people's daily life. But in applications that require detection of extremely faint optical signals, these devices are either useless or require extremely low temperature or low noise circuits to meet the requirements. Avalanche photodiode (APD) is a new type of highly sensitive photodetection and sensing device. It produces an avalanche multiplication effect with the help of a strong internal electric field, so it has a high internal gain and a very fast response. Due to these characteristics, APD detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/378H04N5/335H04N25/00
Inventor 徐申何晓莹杨淼宋文星黄秋华孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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