| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a semiconductor device that ensures high linearity as a threshold voltage follows an input amplitude.SOLUTION: The semiconductor device includes: a first transimpedance amplifier for converting a first current signal generated by a first photodiode into which an optical signal is input to a first voltage signal; a second transimpedance amplifier for converting a second current signal generated by a second photodiode to which an optical signal is blocked to a second voltage signal; a peak hold circuit for holding a peak value of the first voltage signal; a comparator for outputting a pulse on the basis of the first and second voltage signals; and a threshold current setting circuit for drawing a threshold current proportional to a reference current generated from a differential voltage between the peak voltage output from the peak hold circuit and a reference voltage at an output node of the second photodiode, from between the second photodiode and the second transimpedance amplifier.</p> |
