2004•Unpublished venueRequires access

A base control doherty power amplifier for improved efficiency in GSM handsets

Darren Ferwalt, Andreas Weisshaar

Abstract

A Doherty power amplifier that uses DC base voltage to control output power is presented. A single base control amplifier is first analyzed, then two such amplifiers are combined to create a Doherty amplifier for constant envelope modulation schemes, such as GSM. A new GSM power probability density function (PDF) is presented, and the average PA current is calculated using this data. Average current for the base control Doherty amplifier is compared to that of an ideal class B amplifier and to a Doherty amplifier composed of two class B amplifiers. A prototype design is then implemented at 30 MHz with GaAs HBTs, and measured results are reported.

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Available abstract

Key concepts: Amplifier, Doherty amplifier, Linear amplifier, Direct-coupled amplifier, RF power amplifier, Electrical engineering, GSM, Power-added efficiency