Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2008-04-10
2011-11-08
Chen, Junpeng (Department: 2618)
Telecommunications
Transmitter
Noise or interference elimination
C455S102000, C455S108000, C455S110000, C455S115300, C455S125000, C455S126000, C455S127200, C375S296000, C375S297000
Reexamination Certificate
active
08055215
ABSTRACT:
Provided is a transmission circuit capable of operating with high linearity and with low noise. An AM variable fc filter uses an AM cutoff frequency to remove a high frequency component from an amplitude signal. An amplifier supplies a power amplifier with a voltage which is a result of amplifying the amplitude signal outputted from the AM variable fc filter. A PM variable fc filter uses a PM cutoff frequency to remove a high frequency component from a phase signal. A phase modulator phase-modulates the phase signal outputted from the PM variable fc filter to output a high-frequency phase-modulated signal. The power amplifier amplifies the high-frequency phase-modulated signal by using the voltage supplied from the amplifier, and outputs a resultant signal as a transmission signal. The AM variable fc filter and the PM variable fc filter respectively control the AM cutoff frequency and the PM cutoff frequency such that the AM cutoff frequency and the PM cutoff frequency each have an opposite characteristic to that of an output power of the transmission signal.
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Hara Yoshihiro
Hirano Shunsuke
Matsuura Toru
Morimoto Shigeru
Chen Junpeng
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
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