Infrared detection device

Abstract

The invention provides an infrared detection device which mainly comprises a photosensitive diode, an amplifying circuit, a zero cross detection circuit, a gain detection circuit, a pulse broadening circuit and a demodulation circuit. According to the infrared detection device, infrared signals sent by an infrared remote controller according to a specific command are demodulated to specific control signals to control electronic equipment to carry out the specific command. According to the infrared detection device, an analog bandpass filter is not adopted, while digital circuits of the pulse broadening circuit and the demodulation circuit are adopted to achieve functions of filtering and modulation. In all the elements of the infrared detection device, only the amplifying circuit is an analog circuit, most of other elements are completed through digital circuits, thus area consumption of the analog circuit on a silicon wafer can be reduced, and system-on-chip integration is benefited.

Description

technical field [0001] The invention relates to an infrared detection device, in particular to an infrared detection device applied in an electronic device with an infrared remote control. Background technique [0002] Infrared is the most commonly used remote control communication method in consumer electronic products. Almost all home entertainment equipment is equipped with a remote control that uses infrared as a carrier. The infrared remote control is used to send infrared signals with specific commands such as power on and volume adjustment. The electronic device is equipped with an infrared detection device to receive and demodulate the infrared signal as a control signal, and then remotely control the electronic device to execute the specific command. [0003] Low power consumption, low cost and high integration are an inevitable trend of infrared detection devices. However, the current infrared detection devices are all implemented based on the demodulation method ...

AI Technical Summary

Problems solved by technology

Similarly, the above-mentioned infrared detection circuit also uses analog devices for demodulation. Since the analog method requires a large-area capacitor for filtering and demodulation, it is difficult to integrate a complex on-chip digital analog system, and an independent infrared detection chip or component is required. leading to system cost can not be reduced

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