Infrared receiving chip circuit and infrared receiving system

Abstract

The invention provides an infrared receiving chip circuit, which includes an infrared sensing diode and an internal system of the chip; the internal system of the chip includes an input terminal, an electromagnetic wave reflection unit, a pre-amplifier, a variable gain amplifier, a band-pass filter, a comparator, an integrator, a Schmitt trigger, a first transistor, an output terminal, and an automatic gain control unit connected between the output of the comparator and the input of the variable gain amplifier; the first transistor The gate terminal is connected to the output of the Schmitt trigger, its source terminal is connected to the ground terminal, its drain is connected to the output terminal and the drain of the first transistor is connected to the power supply terminal through a series overvoltage resistor . The invention also provides an infrared receiving system comprising the infrared receiving chip circuit. Compared with related technologies, the infrared receiving chip circuit and the infrared receiving system of the present invention have strong anti-interference, good reliability and high accuracy.

Description

technical field [0001] The invention relates to the field of chip technology, in particular to an infrared receiving chip circuit and an infrared receiving system. Background technique [0002] With the development of the information age, various wireless communications have become mainstream. The infrared receiving chip circuit is the main part of signal reception in wireless communication. [0003] In the infrared receiving chip circuit of the related art, the automatic gain control module reads the digital signal output by the comparator and judges whether it is a noise or a useful signal. When the external interference signal strength of the infrared receiving chip circuit is relatively weak, especially electromagnetic wave interference, and the interference signal does not generate large waveform distortion in the infrared receiving chip, the band-pass filter inside the infrared receiving chip The filter can effectively filter out most of the interference signals. ...

AI Technical Summary

Problems solved by technology

[0004] However, when the external interference signal strength is strong, it will cause the signal to be amplified inside the chip and the waveform amplitude on the link is too large, resulting in waveform distortion

Waveform distortion will generate harmonic low-frequency components, and part of the low-frequency components will fall within the band-pass range of the infrared receiving chip circuit, which will cause noise error output at the output end of the infrared receiving chip circuit and increase the bit error rate of signal transmission.

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