NDLI: Balanced front-end SAW modules with improved selectivity at low frequency offsets for handheld transceivers

Content Provider	IEEE Xplore Digital Library
Author	Dberstein, S.
Copyright Year	2009
Description	Author affiliation: Omsk Research Institute of Communications & Electronics (ONIIP), Russia (Dberstein, S.)
Abstract	This paper presents the new balanced front-end SAW modules with the improved selectivity at the low frequency offsets and fractional bandwidth of 1.5–4% for the 440–470 MHz handheld transceivers. The modules contain 2 SAW filters connected across a low noise bipolar transistor amplifier. The balanced longitudinally-coupled resonator SAW filters on 42° YX LiTaO3, 64° YX, 41° YX LiNbO3 were used in these modules to suppress the high frequency (HF) shoulder in the frequency response. The first filter is realized in a 4-pole three-transducer scheme. The second filter with a wider fractional bandwidth is realized in the 4-pole two- or three-transducer scheme. A combination of these two types of the filters with the different fractional bandwidths provides an efficient suppression of the HF shoulder in the frequency response of the modules. The optimization of a SAW filter-amplifier-SAW filter system is provided with a computer simulation using an equivalent circuit model. The 440–470 MHz samples of the balanced front-end modules have shown an amplitude ripple of 1 dB within a 3-dB bandwidth of 6.6–202 MHz, 10 dB g0, improved suppression up to 60 dB at the low offsets of ±13÷ ±30 MHz from the center frequency. The modules provided a noise factor of 2 dB with a current consumption of 5–7 mA and supply voltage of 3 V in the 13.3×6.5×1.8 mm SMD packges.
Starting Page	420
Ending Page	423
File Size	758730
Page Count	4
File Format	PDF
ISBN	9781424435111
ISSN	10756787
DOI	10.1109/FREQ.2009.5168213
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-04-20
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Surface acoustic waves Transceivers Bandwidth SAW filters Hafnium Frequency response 1f noise Low-frequency noise Bipolar transistors Low-noise amplifiers
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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