Infrared receiver on a chip. Scheme, description

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Infrared receiver on a chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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A schematic diagram of a receiver of pulsed IR signals on a microcircuit specially developed for this purpose is shown in Fig. 37.

The output of this photodetector can also be connected directly to the inputs of digital CMOS chips. But although its output resistance is less than that of the transistor described above, with a long line connecting the photodetector with an electronic signal analyzer, it also needs to be supplemented with a buffer amplifier (see Fig. 36, a, b). The capacitance of the communication line in this case can reach up to 0,01 μF.

The FD320 photodiode can be replaced with FD263-01, and if the photodetector has a concentrator lens - with almost any photodiode from Appendix 2.

Infrared receiver on a chip
Rice. 37. IR receiver on a chip

Table 8
Upit,B Ipot, mA
4,5 0,84
5,0 1,00
6,0 1,30
7,0 1,55
8,0 1,90
9,0 2,90

The amplification of the photo head can be reduced by shunting the input of the amplifier with a resistor of 0,3 ... 3 MΩ.

Table 8 shows the dependence of the current Iconsumed by the photohead on the voltage of the power supply Upp.

Publication: cxem.net

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