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參數資料
| 型號： | TFS180A |
| 廠商： | Vectron International, Inc. |
| 英文描述： | VI SAW濾波器(VI SAW Filter) |
| 中文描述： | 六聲濾波器（SAW濾波器六） |
| 文件頁數： | 1/2頁 |
| 文件大小： | 13K |
| 代理商： | TFS180A |
version 1.0
01.11.00
______________________________________________________________________________________________________
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.
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.
The calibration for the plots was made at the 50 Ohm ports. Thus, the measured
characteristics include the losses of the two transformer.
Please note that the centre frequency of the filter will shift slightly if mechanical
stress is applied to the PCB.
2. Theoretical matching
The balanced driven source and load impedances of the filter are:
source impedance:
134
|| - 0.16 pF
load impedance:
140
|| - 0.5 pF
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.
L1
TFS 180A (180MHz) - 1/2
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
Tel: (603) 598-0070 Fax: (603) 598-0075
E-Mail: vti@vtinh.com
8
1
3,9
IN
OUT
TFS 180A
(180 MHz)
C1
C2
L3
12
10
L2
L4
L1 = L2 = L3 = L4 = 25 nH
C1 = C2 = 8,2 pF
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