Pseudo-envelope follower power management system with high frequency ripple current compensation

摘要

Embodiments disclosed in the detailed description relate to a pseudo-envelope follower power management system including a parallel amplifier and a multi-level converter cooperatively coupled to generate a power supply voltage at a power supply output coupled to a linear RF power amplifier. The parallel amplifier output is in communication with the power amplifier supply output. The parallel amplifier governs operation of the multi-level converter and regulates the power amplifier supply voltage base on a V RAMP signal. The parallel amplifier circuit includes an open loop high frequency compensation assist circuit that generates a high frequency ripple compensation current based on an estimate of the high frequency ripple currents contained in a ripple current of the power inductor. The high frequency ripple compensation current is injected into the parallel amplifier circuit output to cancel out high frequency ripple currents at the power amplifier supply output.