Tunable ferroelectric impedance matching networks and their impact on digital modulation system performance

Authors: Erick González-Rodríguez, Holger Maune, Yuliang Zheng, Mohsen Sazegar, Lufei Shen, Ibrahim Asghar Shah, Dirk Dahlhaus, Klaus Hofmann, Rolf Jakoby

Abstract: 
In this paper the bit error rate performance and error vector magnitude of a tunable impedance matching network is analyzed assuming QPSK, 16-QAMand 64-QAMdigitalmodulationschemes. The characterized tunable impedance matching network is based on barium–strontium–titanate ferroelectric thick-film varactors. Inherent dispersive behavior is subsumed into the forward transmission of the passive device. Due to this nonlinear phase response, in general to maximize the overall system performance, an agile tuning of the varactor values is demonstrated, taking into account the phase and group delay of s21 parameter. Detailed signal simulation results based on measured data of a testbed are presented. The influence of varying matched impedances on the tuning behavior with different modulation bandwidths is discussed at a center frequency of 1.9 GHz.

Keywords:
Tunable impedance matching network
Barium–strontium–titanate
Reconfigurable architectures
Bit error rate
Error vector magnitude

Published in: AEÜ-International Journal of Electronics and Communications (Volume 67, Issue 12, December  2013)

Publisher: Elsevier

ISSN Information: 1434-8411

Tunable ferroelectric impedance matching networks and their impact on digital modulation system performance

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