Method of power amplifier switching power control using post power amplifier power detection

A mobile device comprising:

• a processor configured to control the operation of the mobile device;
• a transmitter connected to the processor and configured to send and receive data, the transmitter comprising:
• a power amplifier for generating an amplified transmission signal;
• a detector coupled to receive an output of the power amplifier and configured to provide a detected amplified transmission signal;
• and
• a power management block comprising a switching regulator control block included in a switching regulator control loop, the switching regulator control block configured to generate a power supply control signal by applying a switching control transfer function to the detected amplified transmission signal, the switching control transfer function comprising poles located to stabilize the switching regulator control loop for gain expansion in the power amplifier;
• and a switched mode power supply located in the switching regulator control loop and coupled to the switching regulator control block, the switched more power supply being configured to generate a supply voltage signal for the power amplifier based on the power supply control signal.

A method of providing a supply voltage signal to a power amplifier, the method comprising:

• generating an amplified transmission signal using the power amplifier;
• detecting an output of the power amplifier using a detector to provide a detected amplified transmission signal;
• generating a power supply control signal by applying a switching control transfer function to the detected amplified transmission signal, the switching control transfer function comprising poles located to stabilize a switching regulator control loop for gain expansion in the power amplifier;
• and
• generating the supply voltage signal by providing the power supply control signal to a switched mode power supply.