Multiple-mode modulator to process baseband signals

Details Multiple-mode modulator to process baseband signals Multiple-mode modulator to process baseband signals

2008-01-08

2011-12-20

Vuong, Quochien B (Department: 2618)

Telecommunications

Transmitter

Plural modulation

C455S108000, C455S114200, C455S127200, C375S297000, C375S298000, C375S300000

Reexamination Certificate

active

08081935

ABSTRACT:
A multiple-mode modulator is configured similarly to a direct conversion quadrature modulator with an infusion of an amplitude modulation signal path from a large signal polar modulator to improve the power amplifier efficiency. The multiple-mode modulator also includes a radio frequency signal path. The multiple-mode modulator is configured to receive a baseband signal, convert the baseband signal to a radio frequency (RF) signal, and to process the RF signal according to either a polar mode or a quadrature mode, depending on a time-varying input voltage of the RF signal. When the power amplifier operates in the linear region, the RF signal is processed according to the quadrature mode. When the power amplifier operates in the compressed region, the RF signal is processed according to the polar mode. The multiple-mode modulator can be configured according to a small signal polar architecture or a large signal polar architecture, having either an open-loop or closed-loop configuration.

REFERENCES:
patent: 6043707 (2000-03-01), Budnik
patent: 6275685 (2001-08-01), Wessel et al.
patent: 6906996 (2005-06-01), Ballantyne
patent: 7180384 (2007-02-01), Efstathiou et al.
patent: 7545880 (2009-06-01), Coons et al.
patent: 7853212 (2010-12-01), van Waasen

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