Digital photo induction device

A sensing device and light sensing technology, which is applied in the direction of using electric radiation detectors for light metering, measuring circuits, etc., which can solve the problems of being susceptible to temperature or noise interference, and that a single signal cannot sense two-stage signals.
CN101776479AInactive Publication Date: 2010-07-14DIODES INC
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
DIODES INC
Publication Date
2010-07-14
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a digital photo induction device, which comprises a sample-and-hold amplifier and an analog-digital converter (ADC). A non-inverting input end and an inverting input end of the sample-and-hold amplifier are respectively connected with a photo induction diode; an output end of the sample-and-hold amplifier is connected with the analog-digital converter (ADC); a digital signal can be output by the analog-digital converter (ADC) to fulfill the aim of detecting a light source; and the output of the digital signal is generated along with the change of the light source.
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Description

technical field

[0001] The invention relates to a light sensing device, in particular to a digital light sensing device. Background technique

[0002] see figure 1 As shown, it is a schematic diagram of a photoresistor. The characteristic of photoresistor 100 is that the resistivity changes with the intensity of incident light. It can respond to light. When there is light, it will conduct electricity immediately; when there is no light, it will stop immediately .

[0003] see figure 2 As shown, it is a schematic diagram of a photodiode. The photodiode 200 uses a diode structure. When photons irradiate the depletion region of the diode, the generated electron-hole pairs are separated due to the opposite electric force, and the electron-hole pairs are separated, respectively. Entering the N-type and P-type neutral regions, a photocurrent is formed and the circuit is turned on.

[0004] However, if a general light sensor uses the above-mentioned photoresistor 100 or photod...

Claims

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