Multi-mode envelope restoration architecture for RF...

Details Multi-mode envelope restoration architecture for RF... Multi-mode envelope restoration architecture for RF...

2007-06-26

2007-06-26

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Transmitters

C375S219000, C375S297000, C455S188100

Reexamination Certificate

active

11523899

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.

REFERENCES:
patent: 5446422 (1995-08-01), Mattila et al.
patent: 5732330 (1998-03-01), Anderson et al.
patent: 6215988 (2001-04-01), Matero
patent: 6256482 (2001-07-01), Raab
patent: 6377784 (2002-04-01), McCune
patent: 7123664 (2006-10-01), Matero

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