SAW Filter Specification
Description
tfs400d.
doc
version 1.
1 01/99 ______________________________________________________________________________________________________
VI TELEFILTER Filter Specification TFS 400 D - 1/4 ______________________________________________________________________________________________________
Application The filter is suitable for GSM, DCS 1800 and dual band applications.
It can especially be used in the first IF in which full channel selectivity is not necessary.
The filter is very compact, thus it saves cost and space on the printed circuit board.
Measurement condition Ambient temperature: 25 °C Input power level: 10 dBm Terminating impedances for input: 600 Ω || 90 nH for output: 600 Ω || 90 nH coupling coil 56 nH Construction and pin configuration see page 2 www.
DataSheet4U.
com Characteristics Remark:
Reference level for the relative attenuation arel of the TFD 400 D is the minimum of the pass band attenuation amin.
The minimum of the pass band attenuation amin is defined as the insertion loss ae.
The center frequency fo is the arithmetic mean value of the upper and lower frequencies at the 3 dB filter attenuation level relative to the insertion loss ae.
The nominal frequency fN is fixed on 400 MHz without tolerance.
The given values for the relative attenuation arel and for the group delay ripple have to be reached at the frequencies given below also if the center frequency fo is shifted due to the temperature coefficient of frequency TCf in the operating temperature range and due to a production tolerance for the center frequency fo.
Development Data
______________________________________________________________________________________________________ Insertion loss ae = amin 3,8 max.
6,0 dB including losses in matching circuit (Reference level) ______________________________________________________________________________________________________ Nominal frequency 400,000 MHz fN _____________________________________________________________________________________...
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