Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2005-03-08
2005-03-08
Tokar, Michael J. (Department: 2819)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S053000, C330S129000, C330S136000, C330S149000
Reexamination Certificate
active
06864742
ABSTRACT:
A predistortion circuit for a microwave amplifier and more particularly to predistortion circuit configured as a Doherty amplifier. The predistortion circuit is adapted to be coupled to a downstream Doherty amplifier to precompensate for the gain compression and phase expansion of the downstream Doherty amplifier as the input power level is increased while simultaneously reducing the intermodulation (IM) distortion. In order to provide precompensation, the precompensation circuit is operated at bias level to provide gain expansion and phase compression to cancel out the gain compression and phase expansion of the downstream Doherty amplifier to provide a higher overall linear power added efficiency (PAE).
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Nguyen Khai
Northrop Grumman Corporation
Paniaguas John S.
Tokar Michael J.
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