Patent ID: 6114885
Filing Date: 2000-09-05
Classification: H03K

Abstract:
An integrated driver circuit, comprising:a pull-up circuit that is responsive to a first plurality of impedance control signals and has a first impedance which is a function of a first variable resistance device;a pull-down circuit electrically coupled to said pull-up circuit, said pull-down circuit responsive to a second plurality of impedance control signals and having a second impedance which is a function of a second variable resistance device having a resistance value that is independently controllable relative to a resistance value of the first variable resistance device;means, electrically coupled to said pull-up circuit, for generating the first plurality of impedance control signals which operate to set the first impedance to a level which is proportional to a resistance of the first variable resistance device;means, electrically coupled to said pull-down circuit, for generating the second plurality of impedance control signals which operate to set the second impedance to a level which is proportional to a resistance of the second variable resistance device;wherein said means for generating the first plurality of impedance control signals comprises a first detector having a second plurality of PMOS pull-up transistors therein; andwherein said means for generating the second plurality of impedance control signals comprises a second detector having a second plurality of NMOS pull-down transistors therein.