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Spectrum emission considerations for baseband-modeled CALLUM architectures

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Author

Summary, in English

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.

Publishing year

2005

Language

English

Pages

660-669

Publication/Series

IEEE Transactions on Microwave Theory and Techniques

Volume

53

Issue

2

Document type

Journal article

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • combined analog locked loop universal modulator
  • baseband modeling
  • linear power-amplifier (PA) architecture
  • (CALLUM)
  • loop gain
  • time
  • delay

Status

Published

ISBN/ISSN/Other

  • ISSN: 0018-9480