Feed-forward power amplifier with offline tuning capability

A method for providing offline tuning of a base station transmitter, the base station transmitter including a feed-forward power amplifier comprising a Radio Frequency (RF) input and an RF output, the method comprising:

• providing a simulated carrier signal comprising one or more individual carrier frequencies to the RF input;
• and
• tuning of a carrier cancellation loop using the simulated carrier signal when a processor determines that a carrier signal is not present;
• and
• the base station transmitter further comprising at least one of:
• an output switch operatively coupled to the RF output, wherein the processor controls the output switch to not transmit an output signal when the carrier signal is not present;
• and
• an input switch controlled by the processor to operatively decouple the feed-forward power amplifier from the input carrier signal.

A base station transmitter comprising:

• a feed-forward power amplifier comprising a Radio Frequency (RF) input and an RF output;
• a simulated carrier generator operatively coupled to the feed-forward power amplifier, the simulated carrier generator providing a simulated carrier signal comprising one or more individual carrier frequencies to the RF input;
• and
• a processor operatively coupled to the feed-forward power amplifier and the simulated carrier generator, wherein the processor performs tuning of a carrier cancellation loop using the simulated carrier signal when the processor determines that a carrier signal is not present, where the carrier cancellation loop comprises a first gain shifter and a first phase shifter and wherein the first gain shifter and the first phase shifter controlled by the processor are adjusted in paired movements.