Premium
Highly efficient switched‐mode transmitter using a current mode class‐D RF amplifier
Author(s) -
Schuberth Christian,
Singerl Peter,
Gadringer Michael E.,
Arthaber Holger,
Wiesbauer Andreas,
Magerl Gottfried
Publication year - 2010
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20450
Subject(s) - amplifier , rf power amplifier , power added efficiency , linear amplifier , electrical engineering , cascade amplifier , direct coupled amplifier , doherty amplifier , transmitter , demodulation , baseband , microwave , electrical efficiency , electronic engineering , materials science , physics , power (physics) , engineering , telecommunications , operational amplifier , cmos , channel (broadcasting) , quantum mechanics
This article presents a switched‐mode transmitter architecture using a current mode class‐D (CMCD) amplifier. To achieve high average efficiency for a modulated signal the envelope of the complex baseband signal is transformed into pulses such that the CMCD amplifier is operated either at its peak efficiency or completely switched off. The CMCD amplifier has been designed based on single‐tone active harmonic load‐pull measurements to achieve a power‐added efficiency (PAE) of 61.5% with 25 W output power at 900 MHz using LDMOS FETs. Removing the losses of the demodulation filter and of the amplifier a 10% higher efficiency than in an ideal class‐B amplifier can be obtained for burst‐mode operation with a peak‐to‐average power ratio of 10 dB. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.