Patent ID: 7449896

Claim:
A circuit for sensing a current, the circuit comprising: a first upper resistor having a first end coupled to a first end of a sense resistor, the sense resistor being configured to receive an input current; a second upper resistor having a first end coupled to a second end of the sense resistor, so that the sense resistor defines a first potential between the first and second ends of the sense resistor; a first lower resistor provided between the first upper resistor and the ground; a second lower resistor provided between the second upper resistor and the ground; a first capacitor provided in parallel to the first upper resistor; a second capacitor provided in parallel to the second upper resistor; a third capacitor provided between a power source and a node connected to the first upper resistor and the sense resistor; an amplifier having a first input node and a second input node, the first input node being coupled to a node between the first upper resistor and the first lower resistor, the second input node being coupled to a node between the second upper resistor and the second lower resistor, the first and second input nodes defining a second potential corresponding to the first potential; a fourth capacitor provided between the first input node of the amplifier and the ground; a fifth capacitor provided between the second input node of the amplifier and the ground; and wherein the circuit is enclosed within a single package.