Wideband low loss SAW filters for telecommunication and mobile radio applications

Ivanov, P. G.; Makarov, V. M.; Orlov, V. S.; Shvetts, V.B.

doi:10.1109/ultsym.1996.583793

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…A similar method can be shown for realization of the filters for the module with a fractional bandwidth of 4%. For this purpose the balanced 3t LCR SAW filters on 64° YX LiNbO3 and 2t or 3t LCR SAW filters on 41° YX LiNbO3 can be used [2,3].…”

Section: Balanced Lcr Saw Filters For Modulementioning

confidence: 99%

“…The modules contain 2 SAW filters connected across a low noise bipolar transistor amplifier. The balanced LCR SAW filters on 42° YX LiTaO3, 64° YX, 41° YX LiNbO3 [3] with the different fractional bandwidths were used in these modules to suppress the HF shoulder in the frequency response. The first filter has the unbalanced/balanced input and unbalanced output.…”

Section: Introductionmentioning

confidence: 99%

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

Dberstein

2009

2009 IEEE International Frequency Control Symposium Joint With the 22nd European Frequency and Time Forum

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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 filteramplifier-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 6.6-20.2 MHz, 10 dB gain, 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 13.3x6.5x1.8 mm SMD packages.

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Section: Balanced Lcr Saw Filters For Modulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%