Amplifiers – With periodic switching input-output
Reexamination Certificate
2011-01-11
2011-01-11
Mottola, Steven J (Department: 2817)
Amplifiers
With periodic switching input-output
C330S051000
Reexamination Certificate
active
07868691
ABSTRACT:
Variable gain commutating amplifier apparatus and methods for use in a polar modulator are described. The apparatus may include two or more commutating amplifier stages configured to be switched to an output load based on a desired amplitude and/or transmit power level. The amplifier stages may include cross-coupled differential pairs to cancel RF carrier feedthrough. An additional R-2R ladder circuit may be provided to further extend the dynamic range by reducing the output power at the lowest output stages.
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Abstract in English of Japanese Application Serial JP 11 214935 A, Aug. 6, 1999.
Farias Michael Naone
Groe John B.
Shapiro Eric
Blairtech Solution LLC
Mottola Steven J
Quintic Holdings
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