Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Reexamination Certificate
2006-06-06
2006-06-06
Milord, Marceau (Department: 2682)
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
C455S078000, C455S552100, C455S553100, C455S118000, C455S127400, C455S260000, C375S219000, C375S376000, C370S329000, C370S337000, C370S465000, C370S466000
Reexamination Certificate
active
07058364
ABSTRACT:
A radio transceiver suitable for use in a mobile telephone is provided. The transceiver is operable in dual modes so as to be able to operate with both GSM and UMTS systems. In a preferred embodiment the transmitter section receives base band signals and up-converts them to an intermediate frequency of approximately 450 MHz. This is then mixed with local oscillator frequency of approximately 1.35 GHz, such that a difference frequency allows operation in the GSM 850/950 MHz band, and the sum frequency allows operation in the GSM 1800/1900 MHz bands. The frequency addition allows operation in the UMTS band. The receiver portion of the transceiver comprises a direct conversion receiver for down-converting the received signal without use of an intermediate frequency.
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Atkinson Simon
Birk Palle
Analog Devices Inc.
Milord Marceau
Wolf Greenfield & Sacks P.C.
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