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Low current detection

A photocurrent and electrical coupling technology, which is applied in the direction of photometry, electrical components, and measuring devices using electric radiation detectors, can solve the problems of difficult and impossible measurement of analog-to-digital converter circuits, and achieve a good signal-to-noise ratio (SNR) performance, low cost effect

Pending Publication Date: 2021-10-22
AMS SENSORS GERMANY GMBH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you're not careful, it can be difficult or impossible for the analog-to-digital converter circuit to accurately convert the photodiode signal into a digital light measurement

Method used

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Embodiment Construction

[0026] The present disclosure describes a light sensor architecture for simultaneous use of integration and delta-σ modulation to optimize low current detection. Specifically, the present disclosure relates to a sensor system, more specifically, to a light-to-digital (LTD) converter. For example, a light sensor, a color spectrum sensor, or the like for color detection. The light sensor architecture has an application such as ambient light sensor or a color sensor in which the light sensor is used to measure the level of light. This specification describes an arrangement of a method of optimizing a seminated LTD using a first order Δς modulator (eg, a signal-to-noise ratio (SNR)) method.

[0027] The present disclosure is based on the integral and voltage Δς modulus converter (ADC) of the reset integrator. In some embodiments, the integral and modulation of the photodiode current can operate simultaneously. During each cycle, the modulator operates as a voltage ADC, which voltage r...

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Abstract

A sensor arrangement for light sensing for light-to-frequency conversion. The sensor arrangement includesa photodiode, an integrator operable to perform an integration phase during an integration time by converting a photocurrent generated by the photodiode into an input voltage, a voltage analog-to-digital converter (ADC) operable to perform a modulation phase by converting the input voltage (VIN) into a digital output signal (ADC_RESULT) which is indicative of the photocurrent generated by the photodiode, a first switch electrically coupled to the photodiode and the integrator input, and a second switch electrically coupled to the input voltage node and a second reference voltage.

Description

Background technique [0001] Modern consumer electronics (eg, smartphones) increasingly uses many different sensors, which are typically included in the same device. In a particular application, ambient light sensor is used to display management, where these sensors measuring ambient light brightness. Depending on the brightness of the ambient light, you can adjust the display light and save power. For example, if the ambient light is bright, a higher backlight illumination of the panel may be required. However, if the ambient light is small, the lower backlight illumination of the display panel may be sufficient. By dynamically adjusting the brightness of the display panel, the ambient light sensor helps the display panel to optimize operational power. [0002] The ambient light sensor can include a photodiode that converts the incident light into an analog signal. You can use an analog to digital converter circuit to digit an analog signal. Digital signals can be used to adjust t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/46G01J1/42G01J1/44
CPCG01J1/46G01J1/4204G01J2001/446H03M3/458
Inventor D.斯托耶科维奇P.米卡科维奇
Owner AMS SENSORS GERMANY GMBH