Dual-mode envelope tracking power management circuit

A dual-mode envelope tracking (ET) power management circuit comprising:

• at least one ET amplifier coupled to the RF transmission circuit and having a preconfigured load line and configured to support a normal-power user equipment (NPUE) mode and a high-power user equipment (HPUE) mode, wherein:
• in the NPUE mode, the at least one ET amplifier is further configured to amplify at least one radio frequency (RF) signal to an NPUE voltage based on a supply voltage to cause the at least one RF signal being transmitted from an RF transmission circuit at an NPUE output power in an NPUE RF spectrum;
• and
• in the HPUE mode, the at least one ET amplifier is further configured to amplify the at least one RF signal to an HPUE voltage higher than the NPUE voltage based on a boosted supply voltage higher than the supply voltage to cause the at least one RF signal being transmitted from the RF transmission circuit at an HPUE output power higher than the NPUE output power in an HPUE RF spectrum;
• and
• a power management circuit configured to:
• provide the supply voltage to the at least one ET amplifier when the at least one ET amplifier operates in the NPUE mode;
• and
• provide the boosted supply voltage to the at least one ET amplifier when the at least one ET amplifier operates in the HPUE mode;
• wherein the preconfigured load line of the at least one ET amplifier is maintained constant to match an impedance of the RF transmission circuit between the NPUE mode and the HPUE mode.