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

A technology of APD array and linear mode, which is applied in the direction of TV, electrical components, color TV, etc., can solve the problems of unfavorable integration of circuit signal processing, complex circuit modules, etc., achieve high uniformity, simple circuit structure, and improve distance resolution Effect

Inactive Publication Date: 2014-05-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 distance measurement method as an example is as follows (voltage hold circuit output OUT 3D To buffer 1):

[0038] When the second clock G1 is low, N6 is cut off, I N2 = I N3 = I N5 , The photocurrent is integrated on the integrating capacitor C1 to produce a 2D correlation voltage value. When the ranging is large, G1 is high level, N6 is on, I N3 = I N5 = 2I N2 , Produce a larger light signal current, the light signal current is transmitted to the injection circuit, and the injection circuit will quickly produce a potential drop at the output terminal. The increase in current ensures that the potential drop time is short enough. N6 can be composed of multiple tubes. As the distance measurement increases, the current flowing through N6 increases, and the distance resolution can be improved within a larger detection range.

[0039] If the intensity is measured, output OUT through the injection circuit ...

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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 field of microelectronics and optoelectronics technology. 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 lives. But in applications that require the detection of extremely weak light signals, these devices appear powerless or require extremely low temperature or low noise circuits to meet the requirements. Avalanche photodiode (APD) is a new type of highly sensitive photoelectric detection and sensor device. It generates an avalanche multiplication effect with the help of an internal strong electric field, so it has a high internal gain and a very fast response speed. Because of these characteris...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/378H04N5/335
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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