DRIVE RF POWER AMPLIFIERS WITH A HIGH-FREQUENCY SWITCHING REGULATOR

摘要

Single-cell lithium-ion batteries traditionally have powered RF (radio-frequency) linear power amplifiers in cell phones. Although the use of these linear power amplifiers can help to meet the specification limits for linearity and ACPR (adjacent-channel power ratio) and ACPL (adjacent-channel power-leakage) ratio, their low power-added efficiency can drain the main battery, cause thermal issues, and reduce talk time. This article aims to demonstrate the benefits of using a dc/dc switcher between the battery and the power amplifier by using dynamic voltage scaling. The resulting increase in efficiency corresponds to less generated heat and increases the talk time for a given battery size.