Patent ID: 6538495
Filing Date: 2003-03-25
Classification: G05F

Abstract:
A circuit generating complementary currents comprising:a reference current source; first and second complementary current mirrors connected to said reference current source, each current mirror comprising a master branch comprising a bipolar mirror transistor having a base, and at least one slave branch comprising a bipolar mirror transistor having a base connected to the base of said bipolar mirror transistor in the master branch, said first and second complementary current mirrors delivering the complementary currents at the respective slave branches, with said first complementary current mirror being connected to said reference current source via the master branch thereof; an intermediate current mirror comprising a master branch, a first slave branch connected to the master branch of said second complementary current mirrors, and a second slave branch connected to said reference current source; and a trimming circuit for mutually trimming the complementary currents by substantially equalizing base currents of said bipolar mirror transistors of said first and second complementary current mirrors, said trimming circuit being connected between the master branch of said intermediate current mirror and a common node common to the bases of said bipolar mirror transistors of said first and second complementary current mirrors.