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Boost power amp performance, system efficiency

Posted: 16 Jan 2014     Print Version  Bookmark and Share

Keywords:DC-DC step-down converter  power amplifiers  field-effect transistor  FET  LDO 

A hysteretic DC-DC step-down converter has been widely utilised in 2G/3G/4G RF power amplifiers (PAs) as a replacement for a direct battery supply to the PA's DC supply. By dynamically adjusting the PA supply voltage and bias current, this approach dramatically improves PA efficiency and extends battery life. A bypass mode with a bypass field-effect transistor (FET) or a bypass low dropout (LDO) regulator also reduces dropout voltages across the step-down converter and enhances the output current capability. Together, these functions lower the battery shutdown point and extend battery life.

The increased system efficiency by using a hysteretic step-down converter does, admittedly, involve a trade-off in voltage headroom. This application note discusses how a bypass mode with a bypass FET or a bypass LDO can be integrated into the hysteretic step-down converters to optimise PA performance.

View the PDF document for more information.

Originally published by Maxim Integrated at as "Enhance PA Performance and System Efficiency with Bypass Mode in Hysteretic Step-Down Converters".

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