CN105352474B - A kind of proximity transducer circuit suitable for high-precision increment type ADC - Google Patents
A kind of proximity transducer circuit suitable for high-precision increment type ADC Download PDFInfo
- Publication number
- CN105352474B CN105352474B CN201510750933.7A CN201510750933A CN105352474B CN 105352474 B CN105352474 B CN 105352474B CN 201510750933 A CN201510750933 A CN 201510750933A CN 105352474 B CN105352474 B CN 105352474B
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- Prior art keywords
- increment type
- type adc
- led
- binary channels
- proximity transducer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a kind of proximity transducer circuit suitable for high-precision increment type ADC, including optical sensor, LED, LED drive circuit, and binary channels increment type ADC；The output end connection LED of the LED drive circuit, the output end connection binary channels increment type ADC of optical sensor；The data of a passage output environment light data of the binary channels increment type ADC, another passage output environment light and LED reflection light.
Description
Technical field
The present invention relates to a kind of proximity transducer circuit suitable for high-precision increment type ADC, belong to integrated circuit technique
Field.
Background technology
Proximity transducer adds LED drivings, the reflected light after detection LED drivings, root using the principle of ambient light sensor
The distance of object proximity is determined according to the amount of reflected light.Prior art is as schemed（3）Using the SAR ADC of time-sharing multiplex, detect respectively
Ambient light and reflected light+ambient light；Two item datas subtract each other to obtain reflection light quantity so as to draw object close to distance.Its shortcoming:
A) power consumption is larger, and current signal is become voltage signal by current-to-voltage convertor, it is also necessary to drives SAR ADC, power consumption is very big；b)
SAR ADC precision can not be made high, and high-precision SAR ADC need a large amount of calibration circuits；C) because front end Current Voltage turns
The noise of the noise and SAR ADC of parallel operation in itself, system signal noise ratio does not high.Prior art is as schemed（4）Using time-sharing multiplex
ADC structures are integrated, the following a) system noise of its shortcoming is larger, it is difficult to accomplish high s/n ratio；B) conversion time is grown.
The content of the invention
Goal of the invention：For problems of the prior art and deficiency, the present invention proposes that a kind of high accuracy that is applied to increases
Amount formula ADC proximity transducer circuit.
Technical scheme：A kind of proximity transducer circuit suitable for high-precision increment type ADC, including optical sensor, LED,
LED drive circuit, and binary channels incremental（Increment type） ADC；The output end connection LED of the LED drive circuit,
The output end connection binary channels incremental ADC of optical sensor；A passage of the binary channels incremental ADC
The data of output environment light data, another passage output environment light and LED reflection light.
Compared with prior art, the proximity transducer circuit proposed by the present invention suitable for high-precision increment type ADC compared with
The precision close to optical sensor is preferably improved under low power consumption.
Brief description of the drawings
Fig. 1 is invention circuit theory diagrams；
Fig. 2 is the SECO figure of circuit of the present invention；
Fig. 3 is prior art proximity transducer circuit diagram；
Fig. 4 is prior art proximity transducer circuit diagram.
Embodiment
With reference to specific embodiment, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention, after the present invention has been read, various equivalences of the those skilled in the art to the present invention
The modification of form falls within the application appended claims limited range.
As shown in figure 1, suitable for high-precision increment type ADC proximity transducer circuit, including optical sensor 101,
LED102, LED drive circuit 103, and the output end connection of binary channels incrementalADC104, LED driving electricity 103
LED102, for driving LED102 to work, the output end connection binary channels incremental ADC104 of optical sensor 101；Light
Sensor 101 is used for the light data for gathering ambient light data and being reflected through reflecting object 105, binary channels incremental
The data of an ADC104 passage output environment light data, another passage output environment light and LED reflection light.Two passages
Incremental ADC output data is subtracted each other as reflected light data, so be inferred to object close to distance.
Claims (1)
- A kind of 1. proximity transducer circuit suitable for high-precision increment type ADC, it is characterised in that：Including optical sensor, LED, LED drive circuit, and binary channels increment type ADC；The output end connection LED of the LED drive circuit, the output of optical sensor End connection binary channels increment type ADC；A passage output environment light data of the binary channels increment type ADC, another passage The data of output environment light and LED reflection light；The increment type ADC of two passages output data is subtracted each other as reflected light data, is entered And be inferred to object close to distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510750933.7A CN105352474B (en) | 2015-11-06 | 2015-11-06 | A kind of proximity transducer circuit suitable for high-precision increment type ADC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510750933.7A CN105352474B (en) | 2015-11-06 | 2015-11-06 | A kind of proximity transducer circuit suitable for high-precision increment type ADC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105352474A CN105352474A (en) | 2016-02-24 |
| CN105352474B true CN105352474B (en) | 2017-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510750933.7A Active CN105352474B (en) | 2015-11-06 | 2015-11-06 | A kind of proximity transducer circuit suitable for high-precision increment type ADC |
Country Status (1)
| Country | Link |
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| CN (1) | CN105352474B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632266B (en) * | 2019-01-28 | 2021-04-16 | 上海科世达-华阳汽车电器有限公司 | Detection method for approach switch and related device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103438995B (en) * | 2013-08-13 | 2015-10-21 | 中国电子科技集团公司第二十三研究所 | Multichannel light power automatic monitor and method of testing thereof |
| CN103852193A (en) * | 2014-02-24 | 2014-06-11 | 深圳市普林泰克科技有限公司 | High-performance low-cost temperature detection method for wireless charger |
| CN205156909U (en) * | 2015-11-06 | 2016-04-13 | 南京天易合芯电子有限公司 | Proximity sensor circuit suitable for high accuracy increment formula ADC |
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2015
- 2015-11-06 CN CN201510750933.7A patent/CN105352474B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105352474A (en) | 2016-02-24 |
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