Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2007-11-27
2007-11-27
Nguyen, Patricia (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S053000
Reexamination Certificate
active
10594289
ABSTRACT:
A Doherty amplifier is described which comprises: a power splitter (120) having a first output and a second output, wherein the first output is connected to a main power splitter (392) having first and second outputs which differ in phase by 90°; and the second output is connected to an auxiliary power splitter (342) having first and second outputs which differ in phase by 90°; a main final stage amplifier (234) comprising first (324) and second (325) main paired amplifiers, the inputs of which are connected to the first and second outputs of the main power splitter (352); an auxiliary final stage amplifier (244) comprising first (344) and second auxiliary (345) paired amplifiers, the inputs of which are connected to the first and second outputs of the auxiliary power splitter (342); wherein the output from the first main paired amplifier (334) is connected to the output from the first auxiliary paired amplifier (344) by an impedance inverter (250); and the output from the second main paired amplifier (345) is connected to the output from the second auxiliary paired amplifier by an impedance inverter (251); the amplifier being arranged such that a relative phase shift is introduced to the signals input to the main and auxiliary power splitters to offset the phase shift of the impedance inverters.
REFERENCES:
patent: 4868520 (1989-09-01), Terakawa et al.
patent: 5012200 (1991-04-01), Meinzer
patent: 5786727 (1998-07-01), Sigmon
patent: 5974041 (1999-10-01), Kornfeld et al.
patent: 6653896 (2003-11-01), Sevic et al.
patent: 6897721 (2005-05-01), Hellberg
patent: 7061314 (2006-06-01), Kwon et al.
patent: 7071775 (2006-07-01), Gailus et al.
patent: 7221219 (2007-05-01), Hellberg et al.
patent: 2002/0039038 (2002-04-01), Miyazawa
patent: 2007/0008032 (2007-01-01), Kyu et al.
patent: 1041712 (2000-10-01), None
patent: 9826503 (1998-06-01), None
Search Report from United Kingdom Patent Office dated Jul. 25, 2005.
PCT International Search Report dated Jul. 25, 2005, International Application No. PCT/GB2005/000942 and Written Opinion.
Filtronic Compound Semiconductor Ltd.
Howard & Howard Attorneys P.C.
LandOfFree
Doherty amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Doherty amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Doherty amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3814937