tfs400b.doc
version 1.1
17.03.2000
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VI
TELEFILTER
SAW Filter Specification
TFS 400 B
1/5
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Application
The filter is suitable for GSM, DCS 1800 and dual band receivers. It can especially be used in the first IF in which full channel
selectivity is not necessary. Due to the high frequency the filter is small, thus it saves cost and space on the printed circuit
board. As it has symmetrical input and output it does not need any transformation networks in state of the art IC transceiver
concepts in which symmetrical inputs and outputs are favourable.
Measurement condition
Ambient temperature:
23
°C
Input power level:
10 dBm
Terminating impedances
for input:
580 ohms || -0.72
for output:
580 ohms || -0.72
ext.coil:
47 nH
Characteristics
Remark:
Reference level for the relative attenuation arel of the TFS 400 B 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 centre 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 centre 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 centre frequency fo.
Development Data
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Insertion loss
ae = amin
-
max.
6,5
dB
(Reference level)
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Nominal frequency
-
400,000 MHz
fN
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Usable signal bandwidth
-
min.
140
kHz
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3 dB bandwidth
BW
350
kHz
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Relative attenuation
arel
fN ± 400 kHz ... fN ± 600 kHz
-
min.
15
dB
fN ± 600 kHz ... fN ±
1 MHz
-
min.
27
dB
fN ±
1 MHz ...fN ± 13 MHz
-
min.
35
dB
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Group delay ripple
GD
fN ± 70 kHz
-
max.
2
µs
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Operating temperature range
typ. value
tolerance/limit
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Temperature coefficient of frequency
- 20
°C
... + 70
°C
ca. - 0.036
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Frequency inversion temperature
+ 20
°C
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TC
ppm/K²
Generated:
Checked / approved:
VI TELEFILTER
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-52 / Fax: (+49) 3328 4784-30
E-Mail: tft@telefilter.com
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: (603) 598-0070 Fax: (603) 598-0075
E-Mail: vti@vtinh.com
VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is
assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
VECTRON [ Vectron International, Inc ]
