Wireless circuitry with multiple envelope tracking circuits

A method of operating wireless circuitry comprising:

• with a first envelope tracking amplifier, outputting a first power supply voltage to a first radio-frequency amplifier;
• with a second envelope tracking amplifier, outputting a second power supply voltage to a second radio-frequency amplifier;
• with a voltage converter, assisting the first envelope tracking amplifier with outputting the first power supply voltage;
• and
• with a bidirectional input-output path selectively coupled to the second envelope tracking amplifier, providing a direct current (DC) voltage to the second envelope tracking amplifier.

An electronic device comprising:

• a first group of radio-frequency amplifiers;
• a second group of radio-frequency amplifiers;
• a first envelope tracking integrated circuit coupled to the first group of radio-frequency amplifiers;
• and
• a second envelope tracking integrated circuit coupled to the second group of radio-frequency amplifiers, wherein the first and second envelope tracking integrated circuits are operable in
• a first mode in which the first envelope tracking integrated circuit outputs a power supply voltage to a selected radio-frequency amplifier in the first group of radio-frequency amplifiers while the second envelope tracking integrated circuit outputs a power supply voltage to a selected radio-frequency amplifier in the second group of radio-frequency amplifiers, and
• a second mode in which first envelope tracking integrated circuit outputs power supply voltages to the first group of radio-frequency amplifiers while the second group of radio-frequency amplifiers are idle.