| 摘要 |
PURPOSE:To discriminate an optical receiving signal stably at all times, by giving the optical receiving signal to one of positive and negative input terminals of a comparator and giving the signal to the other terminal of the positive and negative input terminals via a delay circuit. CONSTITUTION:The optical receiving signal is given to the positive input terminal of the comparator 11 via an input resistor 14 and to the negative input terminal via an input resistor 16 after the signal is given for a delay of a prescribed time via a delay circuit 15. Further, an output signal of positive and negative output terminals of the comparator 11 is fed back positively via resistors 12 and 13 to the positive and negative input terminals respectively. Thus, the detection and discrimination of the optical receiving signal is attained stably in following to a rapid fluctuation of the optical receiving signal without being subject to the adverse effect such as temperature drift or the like. |
