| 摘要 |
The present invention allows a configuration with elements inside the LSI, the elimination of manpower by using automatic adjustment, a reduction in the manufacturing cost, and control of the duty ratio in a wide temperature range and a wide dynamic range and includes: a TIA that converts an optical burst signal from a current signal to a voltage signal and that outputs the voltage signal as a differential signal; a peak detection/adder circuit that detects a peaking preamble signal of the differential signal, sets the peaking level to a normal phase and a reversed phase, and adjusts an offset signal; an ATCBUFFER that controls the duty ratio of the output signal by a threshold voltage; a duty detection circuit that detects the duty ratio from a burst signal; a threshold voltage adjustment circuit that adjusts the duty ratio by a new threshold voltage in accordance with the size of the voltage signal corresponding to the duty ratio; and a reset control circuit that can detect a burst signal of the duty detection circuit by a reset signal that confirms the arrival of the burst signal.
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