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US 6,681,101 B1Granted
RF transmitter with extended efficient power control range
AssigneeSkyworks Solutions, Inc.
InventorsBrian Eidson, Mats Lindstrom, Robert Edmund Grange
Life of this patent
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Abstract
A highly efficient radio frequency (RF) transmitter provides both wide bandwidth and an extended power control range. The RF transmitter includes stage switching, bias adjustment, and drain supply modulation. These components are used to provide fine and coarse power control and EER envelope fluctuations. The RF transmitter is useful in wireless communications to increase both handset talk time and battery life.
Claims15
A radio frequency (RF) transmitter for use in transmitting nonconstant-envelope signals, comprising:
- a signal processing block responsive to an input signal:
- a supply modulator responsive to an envelope output of the signal processing block;
- an FM modulator responsive to a phase output of the signal processing block;
- a power amplifier circuit having a plurality of amplifier stages each coupled to the supply modulator, and a plurality of switches configured to bypass selected amplifier stages, and
- an envelope modulator coupled between the envelope output and the supply modulator, wherein the supply modulator comprises:
- a multiplexer configured to receive a signal from the envelope modulator;
- plurality of delay lines connected to the multiplexer and to associated ones of the switches of the amplifiers;
- and
- a plurality of filters connected to corresponding ones of the switches and the drain input terminals, wherein a modulated signal is delivered to selected ones of the amplifiers.
6 more elements
Dependencies are inferred from the claim text.