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A comparison of polar transmitter architectures using a GaN HEMT power amplifier

Cijvat, Pieternella LU ; Tom, Kevin; Faulkner, Mike and Sjöland, Henrik LU (2008) The 15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008
Abstract
In this paper three transmitter architectures are compared, that each use the low-frequency envelope and high-frequency phase component of an RF signal. A power amplifier (PA) with Pulse Width Modulation by Variable Gate Bias (PWMVGB) is compared to an Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) configuration. The test circuit is implemented using a discrete GaN HEMT power amplifier and discrete surface-mount passive components assembled on a PCB. Measurements show that the EER architecture maintains a drain efficiency of 56 to 69% for a wide output power range, while the PA with variable gate bias shows a significant drop in efficiency for lower output powers (from 59 to 6%). Other comparison issues are... (More)
In this paper three transmitter architectures are compared, that each use the low-frequency envelope and high-frequency phase component of an RF signal. A power amplifier (PA) with Pulse Width Modulation by Variable Gate Bias (PWMVGB) is compared to an Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) configuration. The test circuit is implemented using a discrete GaN HEMT power amplifier and discrete surface-mount passive components assembled on a PCB. Measurements show that the EER architecture maintains a drain efficiency of 56 to 69% for a wide output power range, while the PA with variable gate bias shows a significant drop in efficiency for lower output powers (from 59 to 6%). Other comparison issues are modulation of the supply voltage and transmitter complexity. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
polar transmitter, wireless communication, power amplifier
pages
4 pages
conference name
The 15th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2008
external identifiers
  • Scopus:57849120838
language
English
LU publication?
yes
id
37934438-fbd0-4569-ab30-f697c2be0fd5 (old id 1264718)
date added to LUP
2008-11-06 11:12:39
date last changed
2016-10-13 04:59:14
@misc{37934438-fbd0-4569-ab30-f697c2be0fd5,
  abstract     = {In this paper three transmitter architectures are compared, that each use the low-frequency envelope and high-frequency phase component of an RF signal. A power amplifier (PA) with Pulse Width Modulation by Variable Gate Bias (PWMVGB) is compared to an Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) configuration. The test circuit is implemented using a discrete GaN HEMT power amplifier and discrete surface-mount passive components assembled on a PCB. Measurements show that the EER architecture maintains a drain efficiency of 56 to 69% for a wide output power range, while the PA with variable gate bias shows a significant drop in efficiency for lower output powers (from 59 to 6%). Other comparison issues are modulation of the supply voltage and transmitter complexity.},
  author       = {Cijvat, Pieternella and Tom, Kevin and Faulkner, Mike and Sjöland, Henrik},
  keyword      = {polar transmitter,wireless communication,power amplifier},
  language     = {eng},
  pages        = {4},
  title        = {A comparison of polar transmitter architectures using a GaN HEMT power amplifier},
  year         = {2008},
}