Radio-frequency amplifier with load response estimation

Circuitry comprising:

• an upconverter configured to upconvert baseband signals to radio-frequency signals;
• an amplifier configured to receive the radio-frequency signals;
• a filter coupled to an output of the amplifier, the filter having a frequency dependent input impedance;
• and
• predistortion circuitry configured to receive the baseband signals and predistort the baseband signals in accordance with a baseband model that models the frequency dependent input impedance of the filter.

Circuitry comprising:

• a frequency upconversion circuit having an input configured to receive baseband signals and output corresponding radio-frequency signals;
• an amplifier configured to receive the radio-frequency signals;
• a filter coupled to an output of the amplifier;
• and
• a non-linearity estimator coupled to the input of the frequency upconversion circuit and configured to model a non-linear behavior associated with the amplifier and non-linear effects associated with the filter.