Closed-loop power control in conjunction with adaptive power amplifier linearization

A radio frequency transmitting system comprising:

• a programmable amplifier configured to amplify an input signal to generate an amplified signal;
• a power amplifier configured to output a transmit signal in response to the amplified signal, wherein the transmit signal has a transmit power;
• a power detector configured to generate a power measurement in response to the transmit power;
• a calibration module configured to implement a plurality of feedback loops to adjust a gain of the programmable amplifier in response to a difference between the power measurement and a desired transmit power, wherein the calibration module is configured to select one of the plurality of feedback loops in response to the desired transmit power;
• and
• a summing module configured to generate a power command in response to the desired transmit power and an offset, wherein the calibration module generates the offset, and wherein the gain of the programmable amplifier is adjusted in response to the power command,
• wherein the calibration module comprises
• a plurality of count registers each configured to store a count;
• a selection module configured to select one of the plurality of count registers in response to the desired transmit power, wherein the offset is based on the count of the selected one of the plurality of count registers;
• and
• a counter configured to adjust the selected one of the plurality of count registers in response to a difference between up signals and down signals, wherein the up signals and the down signals are generated based on the power measurement.

A method of operating a radio frequency transmitting system, the method comprising:

• using a programmable amplifier, amplifying an input signal to generate an amplified signal;
• using a power amplifier, outputting a transmit signal in response to the amplified signal, wherein the transmit signal has a transmit power;
• generating a power measurement in response to the transmit power;
• implementing a plurality of feedback loops to adjust a gain of the programmable amplifier in response to a difference between the power measurement and a desired transmit power;
• selecting one of the plurality of feedback loops in response to the desired transmit power;
• generating an offset based on the selected one of the plurality of feedback loops;
• generating a power command in response to a sum of the desired transmit power and the offset;
• adjusting the gain of the programmable amplifier in response to the power command;
• generating up signals and down signals based on the power measurement;
• using a plurality of counters, tracking differences between the up signals and down signals;
• selecting one of the plurality of counters in response to the desired transmit power;
• and
• generating the offset based on the selected one of the plurality of counters.

A method of operating a radio frequency transmitting system, the method comprising:

• using a programmable amplifier, amplifying an input signal to generate an amplified signal;
• using a power amplifier, outputting a transmit signal in response to the amplified signal, wherein the transmit signal has a transmit power;
• generating a power measurement in response to the transmit power;
• implementing a plurality of feedback loops to adjust a gain of the programmable amplifier in response to a difference between the power measurement and a desired transmit power;
• selecting one of the plurality of feedback loops in response to the desired transmit power;
• generating an offset based on the selected one of the plurality of feedback loops;
• generating a power command in response to a sum of the desired transmit power and the offset;
• adjusting the gain of the programmable amplifier in response to the power command;
• storing a plurality of counts;
• selecting one of the plurality of counts in response to the desired transmit power;
• generating the offset based on the selected one of the plurality of counts;
• generating up signals and down signals based on the power measurement;
• and
• adjusting the selected one of the plurality of counts in response to a difference between the up signals and the down signals.