Patent ID: 6157259
Filing Date: 2000-12-05
Classification: H03F

Abstract:
A method of providing a current mirror operating in the weak inversion region, comprising the steps of:providing a first CMOS transistor with a source-drain path and a gate;connecting said gate and said drain of said first CMOS transistor to a first terminal of a current supply;connecting said source of said first CMOS transistor to a second terminal of said current supply, thereby creating a current source;providing `n` second CMOS transistors, each having a source-drain path and a gate, said `n` second CMOS transistors having the same gate size as said first CMOS transistor;connecting said gate and said source of each of said `n` second CMOS transistors to said gate and said source of said first CMOS transistor, respectively;connecting said drains of said `n` second CMOS transistors together thereby creating a current mirror; andbiasing said first CMOS transistor to operate in the weak inversion region by selecting a unit drain current I.sub.D for said first CMOS transistor below the strong-to-weak inversion point of a CMOS transistor.