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參數(shù)資料
| 型號(hào)： | TFS70E |
| 廠商： | VECTRON INTERNATIONAL |
| 元件分類(lèi)： | 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, 70.2 MHz, SAW FILTER |
| 文件頁(yè)數(shù)： | 2/2頁(yè) |
| 文件大?。?/td> | 25K |
| 代理商： | TFS70E |
file: A-70E.doc
VI
TELEFILTER
Ltp: tft027
Version 1.0
19.05.2000
Application Note
TFS 70E - 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
3. Matching on the PCB
The matching network on the test board (PCB: tft027) was tested with SMD-components
with Q-value of
≈
30.
ILo (typ.)= - 5,5...5,9 dB.
L
1
= 150 nH.
L
2
= 220 nH.
Commentary.
Both matching networks on the PCB does slightly differ from the theoretical matching. The reasons for
that are parasitics of the PCB and particularly differences in the Q-value of the matching components.
But if the parasitics on the customer board (mentioned parasitics, additional parasitics of active parts) are
different to this PCB, the matching elements will have to be slightly adjusted.
Matching network tolerance for scheme 1:
We have tested on the PCB (tft027) different values of matching elements.
Dependence of filter characteristics on the matching components
L
1
[ nH ]
L
2
[ nH ]
ILo
[ dB ]
BW(-3 dB)
[ kHz ]
Fo (-3dB)
[ MHz ]
τ
[ns]
(1 MHz)
[ ° ]
(0,85 MHz)
TTS
[ dB ]
S
11
[dB]
(1 MHz)
S
22
[dB]
(1 MHz)
180
220
270
-5,75
-5,50
-5,35
870
865
850
70,19
70,20
70,22
140
110
220
4,8
3,9
6,7
-42
-41
-34
15..18
15..18
15..18
-8...-9
-9...-10
-7..-9
150
L
2
[nH]
L
1
[nH]
ILo
[dB]
BW(-3 dB)
[kHz]
Fo (-3dB)
[MHz]
τ
[ns]
(1 MHz)
[ ° ]
(0,85 MHz)
TTS
[ dB ]
S
11
[dB]
(1 MHz)
S
22
[dB]
(1 MHz)
120
150
180
220
270
-5,54
-5,48
-5,51
-5,51
-5,54
864
864
863
864
863
70,19
70,20
70,20
70,20
70,21
108
107
115
113
113
3,63
3,72
3,86
3,79
3,82
41
41
41
42
42
20
20
18
15
10
- 10
- 10
- 10
- 10
- 10
220
The insertion loss, centre frequency group delay ripple and phase ripple slightly depend on the values
L
1
and
L
2
.
The coil
L
2
has to carry out two functions. It has to match the filter at the output and it is has to create an
phase shift of 90° between the two output pins ( pin 5 and pin 6 ). This is the reason for the higher
dependence of filter parameters from tolerances of
L
2
compared to
L
1
.
Scheme 1
6
5
1 2 3 4 5
12 11 10 9 8
14
13
L
1
50
L
2
50
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TFS70F1 | Filter Specification |
| TFS70F | Filter specification |
| TFS70G | Filter specification |
| TFS70H11 | Filter Specification |
| TFS70H12A | Filter Specification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TFS70F | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter specification |
| TFS70F1 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter Specification |
| TFS70G | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter specification |
| TFS70H11 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter Specification |
| TFS70H12 | 制造商:VECTRON 制造商全稱:Vectron International, Inc 功能描述:Filter Specification |
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