Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2007-08-28
2007-08-28
Pascal, Robert (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S286000, C330S295000
Reexamination Certificate
active
11205178
ABSTRACT:
A circuit is disclosed for operating Doherty amplifiers in parallel in a small size circuit and at a low cost while reducing transmission loss and preventing a narrowed band. The circuit has a plurality of Doherty amplifiers and a signal combiner. Each of the plurality of Doherty amplifiers is applied with a distributed input signal which is amplified and delivered by the Doherty amplifier. The signal combiner is made up of a transmission line transformer, is connected to the outputs of the Doherty amplifiers and to its output terminal. The signal combiner has an impedance as viewed from the Doherty amplifiers, which represents an optimal load for the Doherty amplifiers, and an impedance as viewed from the output terminal, which is equal to the characteristic impedance of a transmission line connected to the output terminal. The signal combiner combines the outputs of the Doherty amplifiers and delivers the resulting output from the output terminal.
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Flanagan Krista
Foley & Lardner LLP
NEC Corporation
Pascal Robert
LandOfFree
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