Amplifiers – With amplifier bypass means
Reexamination Certificate
2006-08-15
2006-08-15
Nguyen, Patricia (Department: 2817)
Amplifiers
With amplifier bypass means
C330S149000
Reexamination Certificate
active
07091782
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.
REFERENCES:
patent: 5077532 (1991-12-01), Obermann et al.
patent: 6011434 (2000-01-01), Sakai
patent: 6275105 (2001-08-01), Ghannouchi et al.
patent: 6640110 (2003-10-01), Shapira et al.
patent: WO0150594 (2001-07-01), None
Koninklijke Philips Electronics , N.V.
Nguyen Patricia
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