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參數(shù)資料
| 型號(hào)： | TFS225A |
| 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： | SAW FILTER |
| 文件頁數(shù)： | 1/3頁 |
| 文件大小： | 21K |
| 代理商： | TFS225A |
Ltp: tft031
______________________________________________________________________________________________________
VI TELEFILTER
Application Note
______________________________________________________________________________________________________
1. General
The filter is balanced driven. It is matched to 50
The matching element values given below are valid on the test PCB. If the parasitics on the
customer PCB and on this PCB are different, the matching elements have to be optimised
regarding the circuit and PCB design.
There are ground pin thru’s underneath the filter and in the other areas of the to decrease cross
talk.
The matching elements have been chosen from the E12- series (European standard series with
fixed tolerances) to get the best agreement between the PCB measurement and the
measurement in a reference test fixture.
2. Theoretical matching
The balanced driven source and load impedances of the filter are:
source impedance:
440
|| - 2.6 pF
load impedance:
440
|| - 2.6 pF
Coupling coil:
170 nH
The values of the matching elements which are given below are calculated from the source
and load impedance. If the values of the matching elements are not equal to standard values
the best standard values are given in brackets.
8
LB-IN
version 1.0
29.09.2000
TFS 225 A
1/2
VI TELEFILTER
Potsdamer Strae 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-0 / 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
Tel: (603) 598-0070 Fax: (603) 598-0075
E-Mail: vti@vtinh.com
2
1
7
3,5,6,9,10,11,12
LB-OUT
SAW
C1
L1
C2
L4
L2
L5
L3
4
L1 = L2 = L3 = L4 = 59,4 nH
C1 = C2 = 1,89 pF
L5 = 170 nH
(56 nH)
(1,8 pF)
(150 nH)
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