Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reexamination Certificate
2008-04-08
2008-04-08
Lugo, David B. (Department: 2611)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
C375S300000, C375S302000
Reexamination Certificate
active
07356092
ABSTRACT:
When a transmitting oscillator is built in a communication semiconductor integrated circuit device like a high-frequency IC constituting a wireless communication system, the system prevents degradation of the accuracy of control on the output power of a power amplifier due to noise jumped from an output pin of the transmitting oscillator to an input pin for a detected signal (feedback signal) of an output level of the power amplifier. The transmitting oscillator is built in the high-frequency IC. The detected signal of the output level of the power amplifier, which is detected by a coupler, is attenuated to a level slightly higher than the level of noise jumped from the output pin of the transmitting oscillator to the input pin for a feedback signal of an amplitude control loop, which in turn is inputted to the feedback signal input pin of the high-frequency IC.
REFERENCES:
patent: 5086512 (1992-02-01), Bartz
patent: 6295422 (2001-09-01), Curry et al.
patent: 6433639 (2002-08-01), Numanami et al.
patent: 6750719 (2004-06-01), Toyota et al.
patent: 2003/048525 (2003-02-01), None
“High Linearity RF Amplifier Design”, by P. Kenington, 1979, Artech House, Inc., pp. 162.
Hikasa Kazuhiko
Okada Kazuhisa
Takano Ryoichi
Toyota Kenji
Lugo David B.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Renesas Technology Corporation
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