Patent ID: 8232784

Claim:
A circuit comprising: a first resistor for converting a current flowing through said first resistor to a voltage drop between positive and negative sides of said first resistor; a second resistor coupled to said negative side of said first resistor; and a sense amplifier coupled to said positive side of said first resistor via a first pin of said sense amplifier and coupled to said negative side of said first resistor through said second resistor via a second pin of said sense amplifier, and for employing a negative feedback to generate a sensing current proportional to said current flowing through said first resistor, wherein said sense amplifier further comprises: a voltage follower coupled to said first and second pins via non-inverting and inverting terminals of said voltage follower respectively to cause a voltage at said second pin to follow a voltage at said first pin; and a current mirror coupled to said voltage follower to provide said sensing current proportional to said current flowing through said first resistor.