Amplifiers – With amplifier bypass means
Reexamination Certificate
2007-11-27
2007-11-27
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With amplifier bypass means
C330S149000
Reexamination Certificate
active
11372513
ABSTRACT:
A delay mismatched feed forward power amplifier is disclosed. Loop1includes a main amplifier and is used to derive a carrier cancelled sample of the main amplifier output. Loop2includes an error amplifier used to amplify the carrier cancelled signal derived from Loop1operation in order to cancel distortion products generated due to the nonlinear nature of the main amplifier. Loop2also utilizes a very short Loop2delay line. A significant efficiency gain is provided due to reduced output power losses associated with the Loop2delay line. Lower output losses also results in lower distortion levels produced by the main amplifier. This, in turn, reduces the size and performance requirements placed on the error amplifier. A smaller and more efficient error amplifier is employed resulting in further amplifier system efficiency improvement. The delay mismatch is compensated by a third control loop, a special adaptive control algorithm or a combination thereof.
REFERENCES:
patent: 6275106 (2001-08-01), Gomez
patent: 6700441 (2004-03-01), Zhang et al.
patent: 6819173 (2004-11-01), Louis et al.
Arbab Ezmarai
Gurvich Mark
Hunton Matthew J.
Rabinovich Alexander
Vassilakis Bill
Myers Dawes Andras & Sherman LLP
Nguyen Khanh Van
Powerwave Technologies Inc.
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