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Performance of a Ferroelectric Tunable Pre-Select Filter/Low Noise Amplifier Hybrid Circuit

Published online by Cambridge University Press:  10 February 2011

Guru Subramanyam
Affiliation:
Department of Electrical &Computer Engg., University of Dayton, Dayton, OH 45469
Felix A. Miranda
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135
Robert R. Romanofsky
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135
Fred Van Keuls
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135
Chonglin Chen
Affiliation:
Texas Center for Superconductivity, University of Houston, Houston, TX 77204
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Abstract

In this paper we discuss the performance of a proof-of-concept of a tunable band pass filter (BPF)/Low Noise Amplifier (LNA) hybrid circuit for a possible gain-compensated down-converter targeted for the next generation of K-band satellite communication systems. Electrical tunability of the filter is obtained through the nonlinear electric field dependence of the relative dielectric constant of a ferroelectric thin-film such as strontium titanate (SrTiO3) or barium strontium titanate (BaxSr1−xTiO3). Experimental results show that the BPFs are tunable by more than 5%, with a bipolar biasing scheme employed. The BPF/LNA tunable hybrid circuit was used to study the effect of tuning on the hybrid circuit's performance especially on the amplifier's noise-figure and the gain.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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