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參數(shù)資料
| 型號： | TFS440 |
| 廠商： | VECTRON INTERNATIONAL |
| 元件分類： | 聲表面波濾波器 |
| 英文描述： | VI SAW濾波器(VI SAW Filter) |
| 中文描述： | 1 FUNCTIONS, 440 MHz, SAW FILTER |
| 文件頁數(shù)： | 2/2頁 |
| 文件大?。?/td> | 17K |
| 代理商： | TFS440 |
Ltp: tft025
_____________________________________________________________________________________________
VI
TELEFILTER
Application Note
_____________________________________________________________________________________________
3. Matching on the PCB
LB-IN
version 1.1
01.11.00
TFS 440 - 2/2
VI TELEFILTER
Potsdamer Strae 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-52 / Fax: (+49) 3328 4784-30
E-mail: tft@telefilter.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 International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Phone: (603) 598-0070 Fax: (603) 598-0075
e-mail: vti@vtinh.com
2
1
6
5
4,7,8
LB-OUT
SAW
C1
L1
C2
L4
L2
L3
L5
3
C3
L1 = L2 = 15 nH
L3 = L4 = 12 nH
C1 = C2 = 1,0 pF
C3 = 0,7 pF
L5 = 39 nH
The matching on the PCB does slightly differ from the theoretical matching. The reason for
that are parasitics of the PCB and of the transformers.
But if the parasitics on the customer board (mentioned parasitics, additional parasitics of
active parts) are different to this PCB the matching elements have to be slightly adjusted.
Both in line and shunt elements change both pass band tilt and pass band ripple. But
- The in line coils mainly influences the pass band ripple a decrease of the inductance of the in
line coils will decrease pass band ripple or change a round pass band shape towards a flat
one
- The shunt capacitors mainly influences the pass band tilt an increase of the capacity value
will change the tilt to lower attenuation on the high frequency side of the pass band
The coupling coil mainly influences the bandwidth in pass band of the filter.
The optimum value for the coupling coil is L5 = 49nH (C3=0). This value is not standard, so it
has been used a combination of L5 and C3 standard values.
相關(guān)PDF資料 |
PDF描述 |
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| TFS446A | Filter Specification |
| TFS448 | Filter Specification |
| TFS44E | Filter specification |
| TFS450 | Filter Specification |
| TFS453 | Filter specification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TFS440_00 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter specification |
| TFS440A | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter specification |
| TFS443 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter Specification |
| TFS446A | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter Specification |
| TFS448 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter Specification |
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