Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2005-01-25
2005-01-25
Nguyen, Patricia (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S295000, C330S302000, C330S306000, C330S053000
Reexamination Certificate
active
06847258
ABSTRACT:
It is difficult that the impedance of the circuit part on the output side of an amplifying element at the frequency of a modulating wave is lower, and consequently, it is difficult to more effectively use the linearity of the amplifying element. The phase of a signal of the frequency of the modulating wave included in an amplified signal output from a FET is inverted by a difference frequency inverting circuit. The inverted signal of the frequency of the modulating wave and a signal of the frequency of a modulated wave included in an amplified signal output from a FET cancel each other out at the drain of the FET. At the drain end of the FET, the signal of the frequency of the modulating wave included in the amplified signal of the FET and a signal of the frequency of the modulating wave output from the FET cancel each other out.
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patent: 4295106 (1981-10-01), Kahn
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patent: 5640428 (1997-06-01), Abe et al.
patent: 6396342 (2002-05-01), Takenaka
patent: 2001-111364 (2001-04-01), None
Ishida Kaoru
Matsuyoshi Toshimitsu
Miyaji Masayuki
Nguyen Patricia
RatnerPrestia
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