Wireless Circuitry with Weighted Envelope Tracking Delay

A method of transmitting a radio-frequency signal within a frequency allocation, the method comprising:

• amplifying, using an amplifier, the radio-frequency signal based on a power supply voltage received at a power supply terminal of the amplifier;
• generating, using delay circuitry, a time delay based on a weighting function, wherein the weighting function is weighted more heavily at a center frequency of the frequency allocation than at a non-zero frequency offset from the center frequency, the non-zero frequency offset being within the frequency allocation;
• adjusting, using envelope tracking circuitry, the power supply voltage based on an envelope of a baseband signal associated with the radio-frequency signal;
• and
• causing, using the delay circuitry, the time delay to be imparted to the baseband signal or the power supply voltage.

An electronic device comprising:

• an antenna;
• processing circuitry configured to output a baseband signal;
• converter circuitry coupled between the processing circuitry and the antenna and configured to generate a radio-frequency signal within a frequency allocation based on the baseband signal;
• a power amplifier coupled between the converter circuitry and the antenna and configured to amplify the radio-frequency signal based on a power supply voltage;
• delay circuitry communicatively coupled to a radio-frequency input of the power amplifier;
• and
• envelope tracking circuitry coupled between the delay circuitry and a power supply input of the power amplifier, wherein the delay circuitry is configured to
• generate a delay value based on a weighted average of a set of predetermined delay values, the weighted average exhibiting a weighting that decreases as a frequency offset from a center frequency of the frequency allocation increases, and
• cause the power supply voltage or the baseband signal to be delayed by the delay value.