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Spectrum emission considerations for baseband-modeled CALLUM architectures

Strandberg, Roland LU ; Andreani, Pietro LU and Sundström, Lars LU (2005) In IEEE Transactions on Microwave Theory and Techniques 53(2). p.660-669
Abstract
Linear-transmitters based on combined analog locked loop universal modulator (CALLUM) architectures are attractive, as they promise both high efficiency and high linearity. To date, it has not been possible to analyze a CALLUM transmitter as a linear feedback network due to the nonlinear nature of the control equations governing it. The main purpose of this paper has been the derivation of a linearized model for the control equations, which enables the use of linear network theory in the study of CALLUM. In particular, it can be used to analyze the stability and maximize the bandwidth of the system. Simulation examples are presented on how three different CALLUM architectures behave for enhanced data rates for global system for mobile... (More)
Linear-transmitters based on combined analog locked loop universal modulator (CALLUM) architectures are attractive, as they promise both high efficiency and high linearity. To date, it has not been possible to analyze a CALLUM transmitter as a linear feedback network due to the nonlinear nature of the control equations governing it. The main purpose of this paper has been the derivation of a linearized model for the control equations, which enables the use of linear network theory in the study of CALLUM. In particular, it can be used to analyze the stability and maximize the bandwidth of the system. Simulation examples are presented on how three different CALLUM architectures behave for enhanced data rates for global system for mobile communications evolution and wide-band code-division multiple-access signals. In addition, we have considered the effects of loop time delay, which is the ultimate limiting factor for all feedback-based linear transmitter architectures, particularly for large bandwidths. Finally, it is shown how frequency compensation of the feedback loop improves insensitivity to the loop time delay. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
combined analog locked loop universal modulator, baseband modeling, linear power-amplifier (PA) architecture, (CALLUM), loop gain, time, delay
in
IEEE Transactions on Microwave Theory and Techniques
volume
53
issue
2
pages
660 - 669
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000226910000030
  • scopus:14544282380
ISSN
0018-9480
DOI
10.1109/TMTT.2004.840568
language
English
LU publication?
yes
id
6a86cf0c-f13c-4770-a890-06f67dc53fc7 (old id 254481)
alternative location
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1393210&isnumber=30324
date added to LUP
2007-10-05 15:37:11
date last changed
2017-01-01 07:01:41
@article{6a86cf0c-f13c-4770-a890-06f67dc53fc7,
  abstract     = {Linear-transmitters based on combined analog locked loop universal modulator (CALLUM) architectures are attractive, as they promise both high efficiency and high linearity. To date, it has not been possible to analyze a CALLUM transmitter as a linear feedback network due to the nonlinear nature of the control equations governing it. The main purpose of this paper has been the derivation of a linearized model for the control equations, which enables the use of linear network theory in the study of CALLUM. In particular, it can be used to analyze the stability and maximize the bandwidth of the system. Simulation examples are presented on how three different CALLUM architectures behave for enhanced data rates for global system for mobile communications evolution and wide-band code-division multiple-access signals. In addition, we have considered the effects of loop time delay, which is the ultimate limiting factor for all feedback-based linear transmitter architectures, particularly for large bandwidths. Finally, it is shown how frequency compensation of the feedback loop improves insensitivity to the loop time delay.},
  author       = {Strandberg, Roland and Andreani, Pietro and Sundström, Lars},
  issn         = {0018-9480},
  keyword      = {combined analog locked loop universal modulator,baseband modeling,linear power-amplifier (PA) architecture,(CALLUM),loop gain,time,delay},
  language     = {eng},
  number       = {2},
  pages        = {660--669},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Microwave Theory and Techniques},
  title        = {Spectrum emission considerations for baseband-modeled CALLUM architectures},
  url          = {http://dx.doi.org/10.1109/TMTT.2004.840568},
  volume       = {53},
  year         = {2005},
}