Photoelectric sensor integrated chip for smart home

Abstract

A photoelectric sensing integrated chip applied to smart home relates to photoelectric sensors. The photoelectric sensing integrated chip is provided with a first silicon-based photoelectric detector, a first transimpedance preamplifier, a first DC negative feedback circuit, a second silicon-based photoelectric detector, a second transimpedance preamplifier, a second DC negative feedback circuit, an amplitude limiting amplifier, and an output buffer circuit; wherein an output end of the first silicon-based photoelectric detector is connected with an input end of the first transimpedance preamplifier, an output end of the first transimpedance preamplifier is connected with a first differential input end of the amplitude limiting amplifier, an output end of the second silicon-based photoelectric detector is connected with an input end of the second transimpedance preamplifier, an output end of the second transimpedance preamplifier is connected with a second differential input end of the amplitude limiting amplifier, an output end of the amplitude limiting amplifier is connected with an input end of the output buffer circuit, an output end of the output buffer circuit is connected with an external circuit; the output ends of the amplitude limiting amplifier are connected with the two differential input ends of the amplitude limiting amplifier respectively through the first DC negative feedback circuit and the second DC negative feedback circuit.

Description

technical field [0001] The invention relates to a photoelectric sensor, in particular to a photoelectric sensor integrated chip applied to smart home. Background technique [0002] With the improvement of living standards, people's requirements for high-efficiency and convenient home furnishing are becoming more and more significant, and home automation, informatization, and intelligence will become the mainstream trend. In recent years, with the high development of informatization, the liberalization and high-level of communication, the rapid increase of business volume and the improvement of human's requirements for energy saving, safety, comfort and efficiency of living environment, the demand for smart home is more significant ( Chinese patent CN201410571226.7). In order to achieve intelligence, the input signals such as sound, light, and electricity from the outside world must first be converted into electrical signals that the central processing unit can recognize, an...

AI Technical Summary

Problems solved by technology

Since the converted electrical signal is very weak, it is extremely vulnerable to external influences, resulting in input data errors

In addition, some integrated photoelectric sensors, such as infrared remote control receivers, use the method of directly binding two gold wires from the photodiode to the amplifier circuit, and then package the two together. Although the risk of interference can be greatly reduced, but Need to add a bonding process, increase the cost and risk of unreliable bonding, and the package size cannot be further reduced

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