| 摘要 |
PROBLEM TO BE SOLVED: To reduce an offset between differential output signals.SOLUTION: An amplifier 10 includes an input terminal 10a and an input terminal 10b, a TIA 20, and a compensation circuit 60. The TIA 20 includes a first transistor 21, a second transistor 22, a first current source 23 connected to the input terminal 10a and an emitter terminal 21e, a second current source 24 connected to the input terminal 10b and an emitter terminal 22e, a first loading resistor 25 connected to a collector terminal 21c, and a second loading resistor 26 connected to a collector terminal 22c. A base terminal 21b and a base terminal 22b are supplied with a bias signal Vbias. The offset compensation circuit 60 regulates a first load current IL1 and a second load current IL2 on the basis of voltage signals Voutp, Voutn. The TIA 20 outputs the voltage signals Voutp, Voutn on the basis of collector voltages Vc1, Vc2. |
