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US 2003/0073418 A1Published application
Single output stage power amplification for multimode applications
AssigneeRF Micro Devices, Inc.
InventorsDavid Dening, Victor E. Steel, Jon D. Jorgenson
Life of this patent
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Abstract
The present invention eliminates the need for complex impedance networks or parallel amplification stages for multi-mode mobile terminals. A wideband power amplifier is configured to amplify signals in different frequency bands corresponding to different operating modes. The supply voltage of the wideband power amplifier is adjusted in light of the load impedance of radiating circuitry to achieve a desired output power for the respective operating modes.
Claims30
A radio frequency communication system comprising:
- a) radiating circuitry including an antenna and having a load impedance;
- b) a wideband power amplifier output stage coupled to the radiating circuitry and adapted to amplify a radio frequency signal in each of a plurality of frequency bands corresponding to a plurality of operating modes;
- c) a variable power supply adapted to provide a selected supply voltage for supplying power to the wideband power amplifier output stage responsive to a power control signal;
- and
- d) a control system adapted to generate the power control signal based on a selected one of the plurality of operating modes such that the power delivered to the radiating circuitry for each of the plurality of operating modes from the wideband power amplifier output stage is determined by the selected supply voltage and the load impedance for the frequency band of the selected operating mode.
2 more elements
A method comprising:
- a) amplifying a radio frequency signal in each of a plurality of frequency bands corresponding to a plurality of operating modes with a wideband power amplifier output stage;
- b) coupling the amplified radio frequency signal to radiating circuitry having a load impedance for transmission;
- and
- c) providing a selected supply voltage for supplying power to the wideband power amplifier output stage based on a selected one of the plurality of operating modes such that the power delivered to the radiating circuitry for each of the plurality of operating modes from the wideband power amplifier output stage is determined by the selected supply voltage and a load impedance of the radiating circuitry for the frequency band of the selected operating mode.
1 more element
A communication system comprising:
- a) a wideband power amplifier output stage for amplifying a radio frequency signal in each of a plurality of frequency bands corresponding to a plurality of operating modes;
- b) means for coupling the amplified radio frequency signal to radiating circuitry having a load impedance for transmission;
- and
- c) means for providing a selected supply voltage for supplying power to the wideband power amplifier output stage based on a selected one of the plurality of operating modes such that the power delivered to the radiating circuitry for each of the plurality of operating modes from the wideband power amplifier output stage is determined by the selected supply voltage and a load impedance of radiating circuitry for the frequency band of the selected operating mode.
1 more element
Dependencies are inferred from the claim text.