Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-08-30
2005-08-30
Deppe, Betsy L. (Department: 2637)
Pulse or digital communications
Transmitters
Antinoise or distortion
C455S114300
Reexamination Certificate
active
06937669
ABSTRACT:
A predistortion linear power amplifier utilizes several predistortion computation engines to receive a first carrier signal. The predistortion computation engines also receive input from a predistortion algorithm engine. The predistortion algorithm engine receives its data from a predistortion amplifier sensor that monitors the operating characteristics of the amplifier and also from a feedback control circuit that provides frequency correlated input and feedback data. The processed data from the predistortion algorithm engine is then input into the predistortion computation engine along with the carrier signal. An output combiner circuit takes the output of each predistortion computation engine and generates a single correction estimate, which is then input into the nonlinear amplifier for producing a substantially linear output signal.
REFERENCES:
patent: 6281936 (2001-08-01), Twitchell et al.
patent: 6342810 (2002-01-01), Wright et al.
patent: 6570444 (2003-05-01), Wright
patent: 2002/0027958 (2002-03-01), Kolanek
patent: 2003/0053552 (2003-03-01), Hongo et al.
Aman Asad Ullah
Stephens Robert V.
Tomerlin Andrew T.
Deppe Betsy L.
Motorola Inc.
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