| 摘要 |
A method and an apparatus for modulating a power supply are provided. The method comprises linearly amplifying a radio frequency envelope signal at a linear regulator stage of an envelope tracking power supply modulator. The method further comprises selecting, based on a comparison of a level of the amplified radio frequency envelope signal with an envelope threshold, to output the amplified radio frequency envelope signal directly to a radio frequency power amplifier or to a switcher stage of the envelope tracking power supply modulator which is connected in series with the linear stage. With the claimed inventions, the extra power may be saved and circuitry complex may be reduced, which may lead to low cost, energy saving and device miniaturization. |
