| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter circuit for removing and outputting a noise superimposed on a power supply voltage.SOLUTION: A filter circuit 1 includes a power supply voltage input terminal IN1, a reference voltage input terminal IN2, an output terminal OUT1, a constant current circuit part 2 and a capacitor C1. The constant current circuit part 2 is connected between the power supply voltage input terminal IN1 and the output terminal OUT1. The capacitor C1 is connected between a junction point P1 of the constant current circuit part 2 and the output terminal OUT1, and the reference voltage input terminal IN2. |
