Highly linear, highly efficient wideband RF power amplifier having wide video bandwidth capability

A radio frequency power amplifier (RF PA) apparatus, comprising:

• a first RF PA having an RF input port, a first power supply port configured to receive a first power supply voltage, and an RF output port, the first RF PA operable to deliver RF power to a load over a first range of output RF power levels;
• a second RF PA having an RF input port, a second power supply port configured to receive a second power supply voltage greater than the first power supply voltage, and an RF output port, the second RF PA operable to deliver RF power to the load over a second range of output RF power levels greater than the first range of output RF power levels;
• a first DC blocking capacitor coupled between the RF output port of the first RF PA and an output node of the RF PA apparatus;
• a second DC blocking capacitor coupled between the RF output port of the second RF PA and the output node of the RF PA apparatus;
• and
• a controller configured to facilitate gradual handoffs of RF power delivery between the first and second RF PAs during handoff events and control the first and second RF PAs so that a composite RF output voltage produced at the output node of the RF PA apparatus during any given handoff event remains substantially linear with respect to an RF input voltage over the duration of the any given handoff event.