APPARATUS AND METHOD FOR MODULATING SUPPLY FOR A POWER AMPLIFIER

摘要

An apparatus and method for improving the efficiency of a power supply modulator for modulating a supply voltage of a power amplifier are provided. The apparatus for generating a supply voltage includes a Switching Mode Power Supplier (SMPS) module for generating a current of a power supply signal, and a linear regulator for generating a source current for supplementing an insufficient amount of the current generated by the SMPS module and a sink current for eliminating an excessive amount of the current generated by the SMPS module. The SMPS module generates the current of the power supply signal by selecting at least one of a plurality of power supplies that have different voltages according to a voltage level of an input signal of the SMPS module.