Patent ID: 6441688
Filing Date: 2002-08-27
Classification: H03F

Abstract:
A radio frequency single to differential buffer amplifier comprising:a radio frequency input signal; a matching circuit coupled to the radio frequency input signal which preserves the radio frequency input signal; an output circuit which provides a first output signal and a second output signal wherein the first and second output signals have approximately a same amplitude and are approximately 180 degrees out of phase over a high frequency range of operation and is independent of the input power, wherein the output circuit comprises a first current path which provides the first output signal; and a second current path which provides the second output signal, and wherein the first current path comprises: a transistor coupled to the matching circuit for preserving the radio frequency input signal; a current mirror coupled to the transistor of the first current path which supplies a complementary signal having similar characteristics as the radio frequency input signal; and a load device coupled to the current mirror and to ground which develops the first output signal.