Patent ID: 6600362
Filing Date: 2003-07-29
Classification: G05F

Abstract:
A circuit for parallel sensing current in a power field effect transistor (FET) of a particular conductivity type, the circuit comprising:a sense field effect transistor (FET) of the same conductivity type as said power field effect transistor (FET), a gate terminal of said sense field effect transistor (FET) being connected to a gate terminal of said power field effect transistor (FET) and a source terminal of said sense field effect transistor (FET) being connected to a source terminal of said power field effect transistor (FET); a current conveyor circuit employing exclusively field effect transistors (FETs), said current conveyor circuit having a reference input terminal and a mirror output terminal, said reference input terminal being connected to a drain terminal of said power field effect transistor (FET) and said mirror output terminal being connected to a drain terminal of said sense field effect transistor (FET); and one or more cascode current mirror circuits employing exclusively field effect transistors (FETs), said one or more cascode current mirror circuits utilizing a current flowing in said current conveyor circuit as a reference current.