Title :
Analysis of the integration of envelope tracking with Continuous Class F amplifiers
Author :
Merrick, B. ; Brazil, Thomas J.
Author_Institution :
RF & Microwave Res. Group, Univ. Coll. Dublin, Dublin, Ireland
Abstract :
This paper analyses the suitability of Continuous Class F power amplifiers (PA) for use with envelope tracking (ET) systems. The effect on PA performance of reducing the drain bias is examined. The ET detroughing function is optimised in order to maximise the system linearity. When excited with 5 MHz WCDMA and 20 MHz LTE signals, the ET amplifier was found to improve PAE and ACPR by 18% and 11 dB, respectively, for the WCDMA case, and by 21% and 5 dB respectively, for the LTE case, when compared with a Continuous Class F amplifier without envelope tracking.
Keywords :
UHF power amplifiers; wideband amplifiers; ACPR; ET amplifier; ET detroughing function; LTE signals; PAE; WCDMA signals; continuous class F power amplifiers; drain bias reduction; envelope tracking integration; frequency 20 MHz; frequency 5 MHz; Bandwidth; Gain; Linearity; Multiaccess communication; Performance evaluation; Radio frequency; Spread spectrum communication; Class F; Power Amplifier; broadband; envelope tracking; high efficiency;
Conference_Titel :
Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), 2012 Workshop on
Conference_Location :
Dublin
Print_ISBN :
978-1-4673-2950-7
Electronic_ISBN :
978-1-4673-2948-4
DOI :
10.1109/INMMIC.2012.6331926
