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Voltage-type analog-to-digital conversion circuit and photoelectric sensor using same

An analog-to-digital conversion circuit, a voltage-type technology, applied in the field of photoelectric sensors, can solve the problems of low resolution of the analog-to-digital conversion circuit, and achieve the effect of improving accuracy

Active Publication Date: 2016-09-21
NANJING SILERGY SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a voltage-type analog-to-digital conversion circuit and a photoelectric sensor using it to solve the problem of low resolution of the existing analog-to-digital conversion circuit

Method used

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  • Voltage-type analog-to-digital conversion circuit and photoelectric sensor using same
  • Voltage-type analog-to-digital conversion circuit and photoelectric sensor using same
  • Voltage-type analog-to-digital conversion circuit and photoelectric sensor using same

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Embodiment Construction

[0037] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0038] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0039] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a voltage-type analog-to-digital conversion circuit and a photoelectric sensor using the same. The voltage-type analog-to-digital conversion circuit is used for converting an analog current signal into a digital signal and is characterized by comprising a current integrating circuit for receiving and integrating the analog current signal and outputting an integration voltage signal; an integration voltage amplification circuit for receiving, holding, and amplifying the integration voltage signal and outputting an integration voltage amplification signal; a comparison and quantification circuit for generating a comparison signal according to the integration voltage amplification signal; and a counting circuit for receiving the comparison signal and a clock signal, counting the clock signal when the comparison signal is held at an active level, and using a counting result prior to the inversion of the comparison signal as the digital signal. The voltage-type analog-to-digital conversion circuit may increase the resolution and precision of analog-to-digital conversion.

Description

technical field [0001] The invention relates to a power electronic technology, more specifically, to a voltage-type analog-to-digital conversion circuit and a photoelectric sensor using the same. Background technique [0002] The principle of heart rate detection is that the LED light shines on the wrist, the photodiode receives the reflected light and converts it into a current signal, and then converts it into a digital signal through an analog-to-digital conversion circuit. Due to the beating heart, the blood flow at different times has different reflections on the LED light. Different, but for the same light intensity, the amount of light reflection caused by skin and bones is a fixed value, so measuring the reflected light can be used to determine the heartbeat. The amount of current change received by the photodiode due to pulse beating is pA level, and the change in value converted by the ordinary analog-to-digital conversion circuit is very small, and it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/46
CPCH03M1/46
Inventor 张艳倪何惠森邵丽丽张宝玉
Owner NANJING SILERGY SEMICON TECH CO LTD
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