Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2006-04-18
2006-04-18
Urban, Edward (Department: 2685)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S209000, C455S086000, C455S319000
Reexamination Certificate
active
07031748
ABSTRACT:
The object of this invention is to demodulate received signals having different received signal frequencies with the simple circuit configuration. With the present invention, the fixed frequency signals are generated at the fixed PLL unit310, and simultaneously, the standard frequency signals corresponding respectively to GSM/DCS received RF signals are generated at the channel PLL unit330.And using the image removal mixer370jointly to received RF signals, local oscillation signals having local oscillation frequencies equal to the received signal frequencies of the received RF signals respectively are formed from the fixed frequency signals and the standard frequency signals for receiving. And since the quadrature demodulators254and264demodulate the received RF signals using corresponding local oscillation signals respectively, the circuit configuration can be simplified by sharing the image removal mixer370.Thereby, receiving signals having different received signal frequencies can be demodulated with the simple circuit configuration.
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Frommer William S.
Frommer & Lawrence & Haug LLP
Haroon Adeel
Sony Corporation
Urban Edward
LandOfFree
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