Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2005-10-24
2010-12-07
Shingleton, Michael B (Department: 2815)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S084000, C330S295000
Reexamination Certificate
active
07847630
ABSTRACT:
There is provided an amplifier for combining outputs of a plurality of amplifying circuits to generate an amplifier output. The amplifier includes a first amplifying circuit for operating a first amplifying device in class-AB, wherein the first amplifying circuit is one among the plurality of the amplifying circuits; a second amplifying circuit for operating a second amplifying device in class-B or class-C, wherein the second amplifying circuit is one among the plurality of the amplifying circuits; and a summing node at which an output of the first amplifying circuit is combined with an output of the second amplifying circuit via a first impedance transformer containing a transmission line of an electrical length other than λ/4. The second amplifying device is connected to the summing node via an output matching circuit and a second impedance transformer containing a transmission line.
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Holt “Electronic Circuits Digital and Analog” John Wiley and Sons, Inc. 1978 p. 500.
Yang et al., “Experimental Investigation on Efficiency and Linearity of Microwave Doherty Amplifier”, 2001, IEEE, pp. 1-4.
Japanese Official Action issued in a counterpart Japanese Application No. 2005-319424 dated May 6, 2010.
Adachi Masaru
Okubo Yoichi
Suto Masaki
Takeda Yasuhiro
Bacon & Thomas PLLC
Hitachi Kokusai Electric Inc.
Shingleton Michael B
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