CPC H03F 1/0227 (2013.01) [H03F 3/19 (2013.01); H03F 3/21 (2013.01); H04B 1/3838 (2013.01); H04B 1/40 (2013.01); H03F 2200/102 (2013.01)] | 20 Claims |
1. An envelope tracking system comprising:
a first power amplifier configured to amplify a first radio frequency signal and to receive power from a first supply voltage;
a second power amplifier configured to amplify a second radio frequency signal and to receive power from a second supply voltage; and
an envelope tracker including a first modulator configured to generate a first output current based on an envelope of the first radio frequency signal and a plurality of regulated voltages of different voltage levels, a second modulator configured to generate a second output current based on an envelope of the second radio frequency signal and the plurality of regulated voltages, a multi-output DC-to-DC converter configured to generate a first DC voltage and a second DC voltage, a first combiner configured to combine the first DC voltage with the first output current to generate the first supply voltage, and a second combiner configured to combine the second DC voltage with the second output current to generate the second supply voltage.
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