INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR PROVIDING A POWER SUPPLY

摘要

An integrated circuit is described for providing a power supply to a radio frequency (RF) power amplifier (PA). The integrated circuit includes a low-frequency power supply path including a switching regulator and a high-frequency power suppl path arranged to regulate an output voltage of a combined power supply at an output port of the integrated circuit for coupling to a load. The combined power supply i provided by the low-frequency power supply path and high-frequency power suppl path. The high-frequency power supply path includes: an amplifier including a voltage feedback and arranged to drive a power supply signal on the high-frequency power supply path; and a capacitor operably coupled to the output of the amplifier and arranged to perform dc level shifting of the power supply signal.