Abstract: A power amplifier is described that includes an amplification circuit and a linear regulator. The amplification circuit amplifies an input signal to produce an output signal and provides a feedback signal for tracking the expected power requirements of the output signal. The linear regulator is connectable for receiving as inputs the feedback signal from the amplification circuit and a plurality of fixed voltage supply rails. The linear regulator provides as an output at least one voltage supply to the amplification circuit. In at least one mode of operation, the at least one voltage supply provided to the amplification circuit tracks the expected output requirements of the amplification circuit between two of the plurality of fixed voltage supply rails.

Abstract: A power amplifier is described that includes an amplification circuit and a linear regulator. The amplification circuit amplifies an input signal to produce an output signal and provides a feedback signal for tracking the expected power requirements of the output signal. The linear regulator is connectable for receiving as inputs the feedback signal from the amplification circuit and a plurality of fixed voltage supply rails. The linear regulator provides as an output at least one voltage supply to the amplification circuit. In at least one mode of operation, the at least one voltage supply provided to the amplification circuit tracks the expected output requirements of the amplification circuit between two of the plurality of fixed voltage supply rails.

Abstract: A standby circuit generates a control signal for configuring a main power supply circuit to operate in one of a full operation mode and a standby operation mode. The standby circuit includes a standby power supply block and a control block. The standby power supply block produces a power supply signal for powering the control block. The control block receives a mode control signal that indicates the operation mode and automatically generates a coupling signal based on the mode indicated by the mode control signal. The control signal is based on the coupling signal.