| 摘要 |
PROBLEM TO BE SOLVED: To provide a transimpedance amplifier preferable for miniaturization and lower power consumption.SOLUTION: A TIA1 includes: a TIA core part 11 for outputting a voltage signal whose voltage varies according to a current signal which is an input current signal with a bypass current subtracted; a differential amplification part 12 for outputting a differential voltage signal whose amplitude varies according to the voltage signal; a current bypass part 13 for subtracting the bypass current from the input current signal; a feedback control part 14 for outputting a control signal so that time average of the current signal becomes a predetermined value, according to the differential voltage signal; and a current monitoring part 15 for drawing a monitoring current in proportion to the current amount of the bypass current, according to the control signal. |
