Flying capacitor voltage control in an amplifier

A method comprising:

• receiving an input signal at an amplifier that drives a load with an output voltage;
• producing a modified input signal from the input signal via application of modifications to the input signal, the modifications being based on feedback from a switched output stage of the amplifier, the feedback indicating a voltage of a flying capacitor in the switched output stage of the amplifier;
• producing pulse width modulation signals from the modified input signal;
• driving the load with the output voltage, the output voltage generated based on the pulse width modulation signals;
• and
• the method further comprising:
• generating an error voltage signal indicating a difference between the voltage stored in the flying capacitor and a desired setpoint voltage, the input signal adjusted based on the error voltage signal to produce the modified input signal.

A method comprising:

• receiving an input signal;
• applying modifications to the input signal based on feedback from a switched output stage of an amplifier driving a load;
• producing pulse width modulation signals from the modified input signal;
• and
• driving the load with an output voltage based on the pulse width modulation signals;
• wherein applying the modifications to the input signal includes:
• comparing the feedback to a desired setpoint voltage, the feedback indicating a magnitude of a voltage across a flying capacitor disposed in the switched output stage;
• generating error voltage signal indicating a difference between the magnitude of the voltage across the flying capacitor and the desired setpoint voltage;
• and
• producing the adjusted input signal by modifying the received input signal based on the error voltage signal.