Multi-mode/multi-band power amplifier
First Claim
Patent Images
1. A power amplifier circuit comprising:
- a first input node adapted to receive a radio frequency signal when operating in a first frequency band;
a second input node adapted to receive the radio frequency signal when operating in a second frequency band;
an array of transistors, each transistor having an input and an output, wherein the outputs are coupled together to form a power amplifier output;
a first matching circuit coupling the first input node to the inputs of each transistor in the array of transistors, the first matching circuit having a small impedance when operating in the first frequency band and a large impedance when operating in the second frequency band; and
a second matching circuit coupling the second input node to the inputs of each transistor in the array of transistors, the second matching circuit having a small impedance when operating in the second frequency band and a large impedance when operating in the first frequency band.
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Abstract
The present invention provides a wideband power amplifier for a multi-mode or multi-band wireless communication device. The wideband power amplifier is configured to amplify signals in different frequency bands corresponding to different operating modes. In general, the wideband power amplifier includes multiple matching circuits that operate to combine the signals in the different frequency bands and provide a combined signal to each transistor in an output stage of the wideband power amplifier.
108 Citations
26 Claims
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1. A power amplifier circuit comprising:
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a first input node adapted to receive a radio frequency signal when operating in a first frequency band; a second input node adapted to receive the radio frequency signal when operating in a second frequency band; an array of transistors, each transistor having an input and an output, wherein the outputs are coupled together to form a power amplifier output; a first matching circuit coupling the first input node to the inputs of each transistor in the array of transistors, the first matching circuit having a small impedance when operating in the first frequency band and a large impedance when operating in the second frequency band; and a second matching circuit coupling the second input node to the inputs of each transistor in the array of transistors, the second matching circuit having a small impedance when operating in the second frequency band and a large impedance when operating in the first frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A communications system comprising:
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a modulator providing a radio frequency signal in one of a plurality of frequency bands; and a power amplifier circuit comprising; a plurality of input nodes adapted to receive the radio frequency signal, each of the plurality of input nodes corresponding to one of the plurality of frequency bands; an array of transistors, each transistor having an input and an output, wherein the outputs are coupled together to form a power amplifier output; and a plurality of matching circuits each coupling a corresponding one of the plurality of input nodes to the inputs of each transistor in the array of transistors, each of the plurality of matching circuits having a small impedance in the corresponding one of the plurality of frequency bands and a large impedance in others of the plurality of frequency bands. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification