Dependence of an LED Noise on Current Source Impedance
Takasi Endo, Eitaro Morimoto, Yutaka Hirayoshi, Kouichi Toyoshima · Journal of the Physical Society of Japan · 1997
Photocurrent noise from an LED is measured as a function of the current source impedance. Bandwidth of noise reduction is found to be equal to the inverse of the time constant which is the product of the differential resistance of the LED and a paralelly connected capacitance. The experimental results are described in terms of a simple equivalent circuit.