Dual-mode RF communication device

Details Dual-mode RF communication device Dual-mode RF communication device

2005-10-04

2005-10-04

Vuong, Quochien B. (Department: 2685)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S302000, C455S307000

Reexamination Certificate

active

06952594

ABSTRACT:
A novel RF to IF converter operates in two modes allowing both wide bandwidth signals and narrow bandwidth signals to be processed using the same wide bandwidth bandpass filter as well as a dual-mode image-reject mixer. As a mobile receiver, both wide bandwidth WCDMA or IMT-2000 signals and narrow bandwidth GSM signals pass through the same wide bandwidth channel select filter. In the GSM mode, signals lying to one side of the frequency range of the narrow GSM signal are attenuated by the wide bandwidth channel select filter. Then signals lying to the other side of the GSM signal are attenuated by an image-reject mixer. The image-reject mixer also downconverts the GSM signal. In the WCDMA or IMT-2000 mode, the wide bandwidth channel select filter attenuates signals outside of the WCDMA or IMT-2000 channel bandwidth, and the image-reject mixer downconverts the wide bandwidth signal without rejecting signals.

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