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Photodiode circuit based on background noise elimination and laser ranging system

A photodiode, background noise technology, applied in radio wave measurement systems, distance measurement, measurement devices, etc., can solve the problems of large overall circuit area, unfavorable product miniaturization, and reduced ranging range, and achieves reduced circuit area, Cost reduction, effect of eliminating DC offset

Active Publication Date: 2015-02-18
SHENZHEN KYLE OPTICS TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the technical problems such as the extra added noise in the photodiode circuit used in the prior art, which leads to the narrowing of the distance measuring range, the high cost caused by more components, and the large overall circuit area, which is not conducive to the miniaturization of products, etc., and proposes a Background Noise Cancellation Based Photodiode Circuit with Significant Noise Reduction, Lower Cost, and Smaller Overall Circuit Area

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  • Photodiode circuit based on background noise elimination and laser ranging system
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  • Photodiode circuit based on background noise elimination and laser ranging system

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Embodiment Construction

[0022] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] see Figure 4 , a photodiode circuit embodiment based on background noise elimination proposed by the present invention, which includes a photodiode transconductance amplification module, an operational amplifier integrator module, and a filtering module, and the filtering module is connected to the photodiode transconductance amplification module The output end of the op amp integrator module and the input end of the op amp integrator module, the output end of the op amp integrator module is connected to the input end of the photodiode transconductance amplification module.

[0024] This embodiment proposes a photodiode circuit based on background noise elimination, which uses an operational amplifier integrator module, which can integrate the DC bias output from the photodiod...

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Abstract

The invention discloses a photodiode circuit based on background noise elimination and a laser ranging system. The photodiode circuit based on background noise elimination, provided by the invention, comprises a photodiode transconductance amplifier module, an operational amplification integrator module and a filtration module, wherein the filtration module is connected to the output end of the photodiode transconductance amplifier module and the input end of the operational amplification integrator module; and the output end of the operational amplification integrator module is connected to the input end of the photodiode transconductance amplifier module. According to the photodiode circuit disclosed by the invention, only an operational amplifier, a capacitor and a resistor can be used by the operational amplification integrator module, only a capacitor and a resistor can be used for a filter circuit, a digital element is not used in the whole circuit, extra noise is avoided, the signal to noise ratio of the circuit can be greatly improved, and the ranging range is widened. Meanwhile, because only the operational amplifier, the resistor and the capacitor are used, the cost is greatly reduced compared with the prior art, and the overall circuit area is greatly reduced, so that miniaturization of the product is facilitated.

Description

technical field [0001] The invention relates to the field of photodiode application circuits, in particular to a photodiode circuit capable of eliminating background noise and a laser ranging system using the diode circuit. Background technique [0002] Photodiode circuits are widely used in laser ranging, security inspection equipment, motion control, analytical instruments, biomedical, optical communications, military, aerospace, optical communications and other fields. Among them, the photodiode circuit commonly used in the field of pulsed laser ranging includes a photodiode transconductance amplifier circuit, such as figure 1 As shown, the most basic photodiode transconductance amplification circuit mainly includes operational amplifier U11, photodiode LD1, resistor R11 and capacitor C11. But this circuit output will have a DC bias, such as figure 2 As shown, this DC bias is also the background noise, which is caused by the natural light (background light) of the same...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C3/00G01C3/02
CPCG01C3/08G01S7/4861
Inventor 张石鲁佶
Owner SHENZHEN KYLE OPTICS TECH CO LTD
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