Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2007-06-15
2009-10-13
Choe, Henry K (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S295000
Reexamination Certificate
active
07602241
ABSTRACT:
A multiband Doherty amplifier having a configuration including a divider which divides an input signal into two, a carrier amplifier which amplifies one of the divided signals, a delay element which delays the other divided signal, a peak amplifier which amplifies the output signal of the delay element, an impedance converter which is connected to an output port of the carrier amplifier and performs predetermined impedance conversion and a combiner which combines the output signals of the peak amplifier and the impedance converter, wherein the electric length of the delay element is the same as the electric length of the impedance converter and the impedance converter has N (N≧2) cascade-connected impedance conversion transmission lines and performs substantially the same impedance conversion at each of the N frequencies.
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Narahashi Shoichi
Suzuki Yasunori
Choe Henry K
NTT DoCoMo Inc.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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