Patent ID: 6700419
Filing Date: 2004-03-02
Classification: H03K

Abstract:
A driving circuit for outputting high-frequency signal, comprising:a first operational amplifier having a first first input terminal coupled to a first reference voltage, a first second input terminal and a first output terminal; a second operational amplifier having a second first input terminal coupled to a second reference voltage, a second second input terminal and a second output terminal; a first first-type MOS transistor having a first drain coupled to a first voltage level, a first gate coupled to the first output terminal and a first source coupled to the first second input terminal; a first second-type MOS transistor having a second drain coupled to a second voltage level, a second gate coupled to the second output terminal and a second source coupled to the second second input terminal; a matching resistor having a predetermined resistance coupled between the first source and the second source; a second first-type MOS transistor having a third drain coupled to the first voltage level, a third gate coupled to the first output terminal and a third source; a second second-type MOS transistor having a fourth drain coupled to the second voltage level, a fourth gate coupled to the second output terminal and a fourth source; an output resistor having a first terminal, a second terminal and the predetermined resistance; and a switching device for connecting the first terminal and the third source and the second terminal and the fourth source or connecting the first terminal and the fourth source and the second terminal and the third source.