Method and system for a generation of a two-level signal

Details Method and system for a generation of a two-level signal Method and system for a generation of a two-level signal

2005-12-13

2005-12-13

Kinkead, Arnold (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

C332S107000, C375S238000, C375S239000, C375S298000, C375S300000, C375S353000

Reexamination Certificate

active

06975177

ABSTRACT:
In a modulation system, in order to provide a two-level signal with a desired modulation which is suited to be amplified by a switching mode power amplifier, the modulation system may include a first constant envelope modulator modulating a signal according to a first control signal, a second constant envelope modulator modulating a signal according to a second control signal, and a combining portion combining the output signal of the first and said second constant envelope modulator to a single, two-level pulse-width-modulated signal. The information which is to be represented by the modulation of the single, two-level pulse-width-modulated signal is coded in the first and the second control signals. The invention relates equally to a corresponding method for generating a modulated signal.

REFERENCES:
patent: 6650711 (2003-11-01), Booth
patent: 2004/0101065 (2004-05-01), Hagh et al.
patent: 1271870 (2003-01-01), None
patent: WO 03/034585 (2003-04-01), None
“A 1V, 8GHz CMOS Integrated Phase Shifted Transmitter for Wideband and Varying Envelope Communications Systems”, Hamedi-Hagh et al., IEEE 2003, Custom Integrated Circuits Conference, 4 page document.
“Wideband CMOS Integrated RF Combiner for LINC Transmitters”, IFTU-59, Hamedi-Hagh et al., IEEE MTT-S Digest, 4 page document.
“Linear Amplification with Nonlinear Components” by D.C. Cox, IEEE Transactions on Communications, Dec. 1974, pp. 1942-1945.
“Current Mode Class-D Power Amplifiers for High Efficiency RF Applications” by H. Kobayashi et al, IEEE MTT-S 2001 International Microwave Symposium Digest, ppages 939-942.
“LINC Linear Transmitter Technology Review” by Bob Stengel IMS 2000 Workshop-Efficiency and Linearity Enhancement Methods for RF/MW Transmitters, Jun. 11, 2000.

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