Patent ID: 6696902
Filing Date: 2004-02-24
Classification: H03F,H03H

Abstract:
A circuit for interfacing a balanced radio frequency power amplifier including first and second outputs respectively in phase opposition to an unbalanced load comprising:a first shunt inductor and a series capacitor, the series capacitor being connected on one side to a first output and on another side to the unbalanced load and the first shunt inductor on one side being connected to the first output; a first shunt capacitor and a series inductor, the series inductor being connected on one side to the second output and on another side to the unbalanced load and the first shunt capacitor on one side being connected to the second output; a second shunt inductor connected to the second output; a power supply of the first output; a power supply of the second output; and wherein the series capacitor and the series inductor are part of a flow path to the unbalanced load, the first shunt inductor is part of a flow path from the power supply connected to the first output, and the second shunt inductor is part of a flow path from the power supply connected to the second output and at least one of the first shunt inductor and the series capacitor or the first shunt capacitor and the series inductor form a resonant circuit at or near an operating frequency of the circuit.