Design of a Linearly Assisted Switcher for a Supply Modulated RF Transmitter

摘要

A broadband modulated power supply for envelope tracking or polar RF transmitters has been built. To study the design constraints, an efficient state-based simulation tool was developed. Based on behavioral simulations, a prototype supply was built. It can deliver up to 1W (6V, 150 mA) to a resistive load of 30 ohms with spectral purity of ca. -45 dBc. The power efficiency using a QAM-signal is 49%