Patent ID: 6995607

Claim:
A low-pass filter, comprising: a first element block having a first capacitive element; a second element block having a resistive element and a power supply connected in series to the resistive element, one end of the second element block being connected to one end of the first element block, the other end of the second element block being supplied with a reference voltage; a third element block having a second capacitive element, the third element block being connected in parallel to the second element block; a first input terminal for receiving a first electric current, the first input terminal being connected to the other end of the first element block; and a second input terminal for receiving a second electric current, the second input terminal being connected to a connection point of the first to third element blocks, the direction of the second electric current being the same as that of the first electric current, the magnitude of the second electric current being N times that of the first electric current (where N is a predetermined number), wherein the low-pass filter outputs a voltage generated at the one end of the first element block.