Fast-switching power management circuit and related apparatus

A wireless communication apparatus comprising:

• a fast-switching power management circuit comprising:
• a multi-level voltage circuit configured to simultaneously generate a plurality of output voltages at different voltage levels based on a supply voltage;
• a supply voltage circuit configured to generate the supply voltage based on a battery voltage, wherein the supply voltage differs from the battery voltage by a non-zero headroom;
• a switch circuit and a second switch circuit each coupled to the multi-level voltage circuit to receive the plurality of output voltages;
• and
• a control circuit configured to:
• determine an output voltage target and a second output voltage target;
• control the switch circuit to output a lowest one of the plurality of output voltages that is greater than or equal to the output voltage target;
• control the second switch circuit to output a lowest one of the plurality of output voltages that is greater than or equal to the second output voltage target;
• and
• control the supply voltage circuit to adjust the supply voltage to minimize the headroom in response to a change of the battery voltage;
• a first power amplifier circuit coupled to the switch circuit and configured to amplify a first radio frequency (RF) signal based on the one of the plurality of output voltages outputted by the switch circuit, wherein the first RF signal is a Wi-Fi signal transmitted in a 2.4 GHz Industrial, Scientific, and Medical (ISM) band;
• and
• a second power amplifier circuit coupled to the second switch circuit and configured to amplify a second RF signal based on the one of the plurality of output voltages outputted by the second switch circuit, wherein the second RF signal is a Wi-Fi signal transmitted in a 5 GHz ISM band.