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LED Transmitter Linearity-Control Circuit

2016-04-06 22:04  
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LED Transmitter Linearity-Control Circuit
In analog system, the LED's linearity is required highly. But the linearity is different for different LED and the linearity would change as the temperature changing. This control circuit's LED driver and signal-amplifier circuit can keep the LED's linearity. The amplifier uses a couple of complementary transistors Q1 and Q2 for using to further reduce the secondary distortion. By the R1, R2 and C1's feedback it provides a 75Ω input resistance. The amplifier would send the input signal to a couple complementary driver and the driver's collector polar would output AC coupled signal on the LED. By appropriate choice of R3 it can adjust the bias current.