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Spectrum shaping SAW filters for high-bit-rate digital radio

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3 Author(s)
R. Ganss-Puchstein ; Siemens AG, Munich, West Germany ; C. C. W. Ruppel ; H. R. Stocker

The structure of a QAM radio system is explained. Some novel designs that demonstrate the current status of spectral shaping SAW (surface acoustic wave) filters are presented. Compensation of second-order effects is discussed. Experimental results for a filter for a 140-Mb/s 16 QAM cochannel system with a roll-off factor of 0.19 are shown. Two other examples of filters for a 140-Mb/s, 64 QAM system with a 35% relative bandwidth are also presented.<>

Published in:

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control  (Volume:35 ,  Issue: 6 )