Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2003-12-22
2008-01-01
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S295000
Reexamination Certificate
active
07315207
ABSTRACT:
Pre-distortion compensation circuits (11, 12) are disposed at stages previous to carrier amplifier13and peak amplifier14, respectively. Pre-distortion compensation circuit (11) has such characteristics that compensate carrier amplifier (13) for a distortion characteristically produced on the operation thereof, particularly, an amplitude-phase (AM-PM) distortion, while pre-distortion compensation circuit (12) has such characteristics that compensate peak amplifier (14) for a distortion characteristically produced on the operation thereof, particularly, an AM-PM distortion. Thus, the Doherty amplifier is also compensated for its own AM-PM distortion characteristic to accomplish a low distortion characteristic and implement an ideal power combining operation thereof.
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NEC Corporation
Nguyen Khanh Van
Sughrue Mion Pllc.
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