How does a IR receiver work?

Infrared(IR) receiver, also known as infrared receiver module and infrared remote control receiver, referred to as IRM, is an IC infrared light receiving element, the optical diode and special instruction set integrated circuit (ASIC) combined and packaged products. So far, the infrared receiver for remote control is still widely used in consumer electronics products, such as air conditioners, televisions, set-top boxes, remote control fans, etc.
The infrared receiver is mainly composed of four parts: built-in PIN diode(PD) and preamplifier(IC), bracket and colloids (pigment, epoxy ). The main function of PD is to receive the infrared signal transmitted by the transmitter; IC is the CPU of the IR receiver, mainly composed of silicon crystal core circuit, the main functions are amplification, limiting, filtering and decoding.
Working principle: Infrared receiver can generally receive 850nm ~ 1100nm band of infrared light, which is mainly to receive 940nm infrared light. After the PIN diode monitors the infrared signal, it is converted into an electrical signal, which is processed by the amplifier, limiter, bandpass filter, etc., and finally the signal is restored to the signal waveform at the transmitting end by the decoder, and is output to the control device through the signal output pin of the receiving head, so as to realize the control of the device.
Block Diagram

YISHENGHUA ELECTRONIC CO.,LTD.(MYS) can provide free sample testing, product circuit and technical support.
Our main products include: infrared receiving head, SMT ir receiver, infrared receiver cable, infrared transmitter cable, infrared receiver extender.