Radio apparatus comprising an amplifier for radio-frequency signals, amplifier for radio-frequency signals and method for amplifying such signals
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United States of America Patent
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Aug 15, 2006
Grant Date -
Jul 28, 2005
app pub date -
Apr 22, 2003
filing date -
Apr 30, 2002
priority date (Note) -
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Abstract
This apparatus comprises a high-frequency signal amplifier formed by a main power stage (30) which has an input for an incoming signal, an output for the amplified signal and a gain control (37). This amplifier also comprises a first comparator (49) for producing a signal that has a distortion level between the incoming signal and the amplified signal, and a differential element (45) for removing the distortion signal from the amplified signal. Moreover, for the distortion signal to be of the same level as the distortions caused by the main power stage, a secondary amplifier stage (53) is added which is inserted in a canceling loop so that the power of its output signal is constant. This loop is constituted by a measuring circuit for measuring the output power of said auxiliary amplifier stage by a comparing circuit for comparing this power to a reference value (61) and by a processing circuit (58) for influencing said gain control (37). Application: Amplifier for mobile radio telephones.
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