Efficiency improvement in a wireless transmission circuit

A wireless device comprising a wireless transmission circuit, the wireless transmission circuit comprising:

• a power amplifier circuit comprising:
• a carrier amplifier always activated to amplify a radio frequency (RF) signal based on an average power tracking (APT) voltage;
• a peak amplifier activated by a bias voltage to further amplify the RF signal based on the APT voltage;
• and
• a bias circuit configured to:
• generate the bias voltage to thereby activate the peak amplifier when an output power of the RF signal is higher than or equal to a threshold value;
• and
• refrain from generating the bias voltage to thereby deactivate the peak amplifier when the output power of the RF signal is lower than the threshold value;
• a power management integrated circuit (PMIC) configured to generate the APT voltage based on a target voltage;
• and
• a transceiver circuit configured to:
• generate and provide the RF signal to the power amplifier circuit;
• indicate the output power of the RF signal to the bias circuit;
• and
• generate the target voltage based on the output power of the RF signal.

A method for improving wireless transmission efficiency comprising:

• always activating a carrier amplifier to amplify a radio frequency (RF) signal based on an average power tracking (APT) voltage;
• activating a peak amplifier by a bias voltage to further amplify the RF signal based on the APT voltage;
• generating the bias voltage to thereby activate the peak amplifier when an output power of the RF signal is higher than or equal to a threshold value;
• and
• refraining from generating the bias voltage to thereby deactivate the peak amplifier when the output power of the RF signal is lower than the threshold value.