Integrating light sensor circuit
AssigneeSensortek Technology Corp.
InventorsHsing-Chien Chu, Tsung-Han Wu, Chi-Hsuan Sun, Meng-Yong Lin
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Abstract
The present application discloses a light sensor circuit comprising a first amplifier, a second amplifier and an active load. An integration circuit is formed by the operation of this light sensor circuit and connected to a photodiode. The cathode of the photodiode is controlled to maintain an identical or approximate voltage level with the anode of the photodiode, which significantly reduces the influence of the dark current from the photodiode. Consequently, when applied to an analog-to-digital conversion device, the light sensor circuit effectively maintains the performance and accuracy of the device. Additionally, this design significantly reduces circuit complexity and manufacturing costs.
Claims8
A light sensor circuit, comprising:
- a first amplifier, including a first input, a second input, and a first output;
- a second amplifier, including a third input, a fourth input, and a second output, and the third input and the fourth input coupled to the two terminals of a holding capacitor, respectively;
- an active load, including an integration output, and the first output and the second output coupled to the active load, respectively;
- a first switch, coupled between the first input and the second input;
- a second switch, coupled between the integration output and the fourth input;
- and
- a third switch, coupled between the third input and a reference voltage;
- wherein the light sensor circuit is operated to be formed as an integrating unit, the second input acts as an integration input, the integration output and the integration input are coupled to two terminals of an integration capacitor.
Dependencies are inferred from the claim text.