Apparatus and method for calibration of supply modulation in transmitter

A transmit apparatus having a supply modulator, the apparatus comprising:

• a detector for detecting an output signal of the supply modulator;
• a modulator/demodulator (modem) for receiving the detected output signal of the supply modulator from the detector, for determining a calibration signal for calibrating a modulation characteristic of the supply modulator, and for providing the calibration signal to the supply modulator;
• and
• the supply modulator for outputting a modulated signal according to the modulation characteristic of the supply modulator that is calibrated based on the calibration signal provided from the modem.

A method of calibrating a supply modulator of a transmitter, the method comprising:

• detecting an output signal of the supply modulator;
• and
• receiving the detected output signal of the supply modulator from a detector, and
• calibrating a modulation characteristic of the supply modulator.

A method of calibrating a supply modulator of a transmitter, the method comprising:

• providing a calibration signal for calibrating a modulation characteristic of the supply modulator, to the supply modulator;
• calibrating a modulation characteristic of the supply modulator based on the calibration signal from a modulator/demodulator (modem);
• and
• outputting a modulated signal in accordance with the calibrated modulation characteristic of the supply modulator.

A method of calibrating a supply modulator of a transmitter, the method comprising:

• detecting an output signal of the supply modulator;
• receiving the detected output signal of the supply modulator from a detector, determining a calibration signal for calibrating a modulation characteristic of the supply modulator, and providing the calibration signal to the supply modulator;
• and
• outputting a modulated signal according to the modulation characteristic of the supply modulator that is calibrated based on the calibration signal provided from a modulator/demodulator (modem).