Pulse or digital communications – Transmitters
Reexamination Certificate
2006-10-17
2006-10-17
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Transmitters
C375S219000, C375S297000, C330S010000
Reexamination Certificate
active
07123664
ABSTRACT:
An RF transceiver having dual-mode envelope restoration architecture. In narrow-band applications such as GSM/EDGE, a switch-mode amplifier is used to provide an envelope signal for amplitude modulating the phase-modulated signals. To achieve required modulation bandwidth in wide-band applications such as WDCMA, an analog amplifier is used to provide the envelope signal. Furthermore, in the wide-band mode, the envelope modulation is applied through the base of an emitter follower while the collector voltage is scaled to achieve a desired power output in the amplitude-modulated signals.
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Ghebretinsae Temesghen
Nokia Corporation
Ware Fressola Van Der Sluys & Adolphson LLP
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