Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Reexamination Certificate
2008-04-15
2008-04-15
Nguyen, Tony T. (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
C455S073000, C455S118000, C455S127300, C375S141000, C375S345000
Reexamination Certificate
active
07359678
ABSTRACT:
The invention provides a signal processing semiconductor integrated circuit of the direct conversion system, which includes a dummy amplifier having the same circuit configuration as a low noise amplifier being the first stage amplifier, in which the DC offset calibrations on the subsequent stage amplifiers are carried out during shifting into the reception mode in a state that the low noise amplifier is deactivated and the dummy amplifier is activated. Thereby, the invention achieves to suppress generation of the DC offsets resulting from the leakage noises of the local oscillator during shifting into the reception mode, and to enhance the reception sensitivity.
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Hagino Noriyoshi
Hayashi Norio
Matsui Toshiki
Tanaka Satoshi
Watanabe Kazuo
Hitachi ULSI Systems Co. Ltd.
Miles & Stockbridge PC
Nguyen Tony T.
Renesas Technology Corp.
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