APD pixel block output voltage four-channel selection circuit
A technology for selecting circuit and output voltage, which is applied in the field of four-channel selection circuit for 2×2APD pixel block output voltage, which can solve the problem of inaccurate determination of light position and achieve the effect of precise positioning
Inactive Publication Date: 2016-02-24
HUAZHONG UNIV OF SCI & TECH
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[0003] Aiming at the problem that there is only a single-point voltage output in the prior art, which makes the determination of the illumination position inaccurate, this application provides a 2×2APD pixel block output voltage four-channel selection circuit, in which the key components such as Select the specific structure and setting method of the control circuit and channel selection circuit to research and design, realize the sequential output of the pixel block voltage, and have the advantages of precise positioning, so it is especially suitable for the application of multi-point voltage output
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[0021] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0022] Such as Figure 4 As shown, the APD structure adopted by the present invention includes a photodiode 1, an address selection control circuit 2, an address encoding circuit 3, and an address output circuit 4. When the detector is working, each APD is in a working mode that can detect light, that is, the corresponding photodiode converts the light signal into a current signal and generates a light...
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The present invention discloses a 2*2 APD pixel block output voltage four-channel selection circuit. Each individual APD unit comprises an address selection control circuit and a four-channel selection circuit. The address selection control circuit detects a generated control signal through light and is connected to a four-channel selection circuit switch, wherein the control signal of each unit is connected to an own channel 1 and is respectively connected to the channel 2, the channel 3 and the channel 4 of other three APD units in 2*2 APD pixel blocks. In each time of illumination, only a pixel block head address output control signal is effective, and thus the sequential output of pixel block voltage from the four channels is ensured.
Description
Technical field [0001] The invention belongs to the field of Avalanche PhotoDiode APD (Avalanche PhotoDiode APD) arrays, and more specifically, to a four-channel selection circuit for output voltage of 2×2 APD pixel blocks. Background technique [0002] The APD array reading circuit is widely used in communications, imaging and ranging, especially in the military field. It has important uses. The traditional APD array can only perform single-pixel photosensitive detection and output single-point voltage. For multi-point photosensitive and There is very little research on the output of multi-point voltage corresponding to the voltage channel, and the light area received by multi-point light is larger, and the spot position can be actively and quickly adjusted according to the lighting conditions of multiple APD units. At the same time, the spot position can be adjusted through the size of the multi-point voltage. For fine-tuning and precise positioning, it is of great significance...
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IPC IPC(8): H05B37/02
Inventor 余国义黄伟陈壮邹雪城郑朝霞
Owner HUAZHONG UNIV OF SCI & TECH