Baseband frequency selective and symbol based power adaptive magnitude and phase adjustment for wideband Doherty power amplifiers

A method in a Doherty power amplifier, the method being implemented by a radio interface, the method comprising:

• for each of a plurality of input signals received by the Doherty power amplifier, each input signal being associated with a different one of a plurality of carrier frequencies:
• detecting an envelope of the input signal;
• determining a dynamic power splitter setting in response to the detected envelope;
• splitting the input signal into a main path signal in a main path and a peak path signal in a peak path according to the dynamic power splitter setting;
• adjusting a phase of the main path signal according to a main path phase adjustment that is based at least in part on the detected envelope;
• and
• adjusting a phase of the peak path signal according to a peak path phase adjustment that is based at least in part on the detected envelope;
• and
• upconverting a sum of the main path signals to provide a main amplifier input signal;
• upconverting a sum of the peak path signals to provide a peak amplifier input signal;
• amplifying the main amplifier input signal;
• and
• amplifying the peak amplifier input signal.

A Doherty power amplifier, comprising:

• an input having a first signal path and a second signal path;
• the first signal path configured to receive a first input signal at a first frequency, the first signal path having first circuitry configured to split the first input signal into a first main path signal and a first peak path signal according to a first splitter ratio determined in response to a first envelope of the first input signal;
• and
• the second signal path configured to receive a second input signal at a second frequency, the second signal path having second circuitry configured to split the second input signal into a second main path signal and a second peak path signal according to a second splitter ratio determined in response to a second envelope of the second input signal.