Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2007-05-18
2010-06-29
Nguyen, Lee (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S127100
Reexamination Certificate
active
07747230
ABSTRACT:
A transmission modulation apparatus capable of dealing with characteristic variations of a high-frequency power amplifier without always forming an amplitude loop. Transmission modulation apparatus100is configured with level detector140that receives input of a level detection control signal and detects the output signal of high-frequency power amplifier130, and offset voltage correcting section150that corrects an offset voltage using collinear approximation including a first point where the relationship between the power supply voltage value and the output voltage starts to shift from linear to non-linear based on an output signal of level detector140and a second point where output voltage is a minimum. Offset voltage correction is adaptively executed, and linearity between the voltage value of the baseband amplitude signal and the output voltage of high-frequency power amplifier130when the voltage value of the baseband amplitude signal is low is compensated.
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Ikedo Taichi
Ishida Kaoru
Dickinson Wright PLLC
Nguyen Lee
Panasonic Corporation
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