Waveforms for envelope tracking transmitter

Details Waveforms for envelope tracking transmitter Waveforms for envelope tracking transmitter

2002-04-18

2009-06-23

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S295000, C375S296000, C455S114300, C455S127100, C455S127200, C330S199000

Reexamination Certificate

active

07551688

ABSTRACT:
A method and device for improving the efficiency of an envelope tracking transmitter in which a power amplifier for coupling modulated signals in a carrier frequency to an antenna for transmission. The transmitter comprises a power supply for providing a supply voltage to the power amplifier, and a computation means for providing a waveform indicative of the envelope of the modulated signal to the power supply in order to modify the supply voltage. A lower limit is imposed to the waveform so that the supply voltage to the power supply is always greater than a predetermined value. Moreover, when information is transmitted in times slots which are started and ended by ramp periods, a constant signal, based on the root-mean-square value of the waveform, is used to modify the waveform so that the supply voltage to the power amplifier includes a constant voltage level in the ramp periods.

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