Balanced front-end hybrid SAW modules with impedance conversion

This paper presents the new balanced front-end hybrid SAW modules with impedance conversion in a fractional bandwidth of 1.5-7% for 146-174 MHz handheld transceivers. The modules are connected between a low impedance antenna and high impedance double balanced mixer (DBM). 2 balanced SAW filters conn...

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Bibliographic Details
Published in2002 IEEE Ultrasonics Symposium, 2002. Proceedings Vol. 1; pp. 123 - 126 vol.1
Main Authors Doberstein, S.A., Razgoniaev, V.K.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2002
Subjects
1f noise
Bandwidth
Computer simulation
Equivalent circuits
Gain
Impedance
Low-noise amplifiers
SAW filters
Surface acoustic waves
Transceivers
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Summary:This paper presents the new balanced front-end hybrid SAW modules with impedance conversion in a fractional bandwidth of 1.5-7% for 146-174 MHz handheld transceivers. The modules are connected between a low impedance antenna and high impedance double balanced mixer (DBM). 2 balanced SAW filters connected across a low noise amplifier are used in these modules. The balanced low-loss ring SAW filters on 128 /spl deg/YX LiNbO/sub 3/ and three-transducer SAW filters with unidirectional IDTs having U-shaped MSCs on 128/spl deg/YX, 64/spl deg/YX, 41/spl deg/YX LiNbO/sub 3/ are used. An optimization of a SAW filter-amplifier-SAW filter system was provided with a computer simulation using the equivalent circuit model. The 155-169 MHz balanced front-end SAW modules have shown a 3-dB bandwidth of 2.3-11 MHz, 12 dB gain, suppression above 80 dB. The modules are housed in the 16/spl times/7.3/spl times/2.6 mm SMD packages.
ISBN:0780375823
9780780375826
ISSN:1051-0117
DOI:10.1109/ULTSYM.2002.1193367