Telecommunications – Transmitter
Patent
1997-12-31
2000-10-31
Bost, Dwayne D.
Telecommunications
Transmitter
455127, 455108, H04B 102
Patent
active
061415413
ABSTRACT:
A method (200) and device (100) provide an efficient linear power amplifier that generates a variable-envelope radio frequency RF signal. The method includes the steps of: A) using an efficient envelope-following unit to output a supply voltage in accordance with a variable envelope of an input baseband signal, wherein using the efficient envelope-following unit includes: 1) using a bandwidth-limiting mapping unit to determine a reference signal based on the baseband signal; and 2) using an envelope-tracking power converter to output a supply voltage, responsive to the reference signal, to the linear RF power amplifier; B) providing an RF input signal with amplitude and phase information to a linear RF power amplifier; and C) using the linear RF power amplifier to output a power-efficient amplified variable-envelope RF signal with substantially a same amplitude and phase information as the RF input signal.
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Connell Lawrence E.
Gillig Steven F.
Grosspietsch John
Khan Andrew Merritt
Midya Pallab
Bost Dwayne D.
Motorola Inc.
Redmon Joy
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