Current sensor

A current sensor, comprising:

• a first input terminal and a second input terminal configured to be capable of having a sense resistor connected therebetween;
• a square wave generation circuit connected to the first and second input terminals, the square wave generation circuit being configured to be capable of generating a square-wave signal with an amplitude proportional to a voltage across the sense resistor;
• and
• a current sense signal output circuit configured to be capable of outputting based on the square-wave signal a current sense signal corresponding to a current passing through the sense resistor,
• wherein the square wave generation circuit includes:
• a first output terminal and a second output terminal;
• a first switch provided between the first input terminal and the first output terminal;
• a second switch provided between the second input terminal and the second output terminal;
• a third switch provided between the first input terminal and the second output terminal;
• and
• a fourth switch provided between the second input terminal and the first output terminal, and
• the current sensor further includes a switch control circuit configured to generate the square-wave signal between the first and second output terminals by controlling states of the first to fourth switches.