Patent ID: 6633468
Filing Date: 2003-10-14
Classification: H01L

Abstract:
A structure, comprising:an external terminal; a supply voltage terminal; a reference terminal; a first transistor having a current path coupled to the external terminal and having a first control terminal; a capacitor coupled between the external terminal and the first control terminal; a second transistor having a current path coupled between the current path of the first transistor and the reference terminal and having a second control terminal; and a bias circuit coupled between the supply voltage terminal and the reference terminal, the bias circuit arranged to produce a first voltage at the first control terminal and a second voltage different from the first voltage at the second control terminal, wherein the bias circuit comprises a third transistor having a first conductivity type and a fourth transistor having a second conductivity type, the fourth transistor having a current path coupled between the first control terminal and the second control terminal.