Background Three-level converters are used in various power management applications such as DC-DC converters, average power tracking (APT), and envelope tracking modulators to efficiently regulate output voltage to a voltage different from the supply voltage. Advantages of three-level converters include low output current ripple, smaller off-chip inductor,...

As a result of inefficiency, radio frequency (RF) power amplifiers typically consume high levels of current. Consequently, there have been numerous attempts to use external circuitry in order to improve the efficiency of RF power amplifiers located on integrated circuits (ICs); however, these attempts have failed to provide the desired improvements...