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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 www.maxim-ic.com as "Enhance PA Performance and System Efficiency with Bypass Mode in Hysteretic Step-Down Converters".





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