BFP720 WLAN LNA 5 6G

BF P720
LNA usi ng BF P72 0 f or W LA N 5-6 G Hz
Applic atio n
Technic al Rep ort T R 154
Revision: V1.0
Date: 11 November 2009
RF and Protecti on Devi c es
Edition 11 November 2009
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2009 Infineon Technologies AG
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all
warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual
property rights of any third party.
Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.
Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the
failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life
support devices or systems are intended to be implanted in the human body or to support and/or maintain and
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persons may be endangered.
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
TR154
Revision History: 11 November 2009
Previous Revision: No Revision
Page
Technical Report, TR154
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11 November 2009
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
1
Overview
Device :
BFP720
Application:
LNA using BFP720 for WLAN 5-6GHz Application
PCB Marking: BFP640-052402 Rev C
2
Summary of Measurement Results
Table 1
Summary of Measurement Results
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
3
V
Icc
mA
10.1
mA
Frequency Range
Freq
Gain
G
14.9 14.4 13.8
dB
Noise Figure
NF
1.2
1.15
dB
Input Return Loss
RLin
10.2 10.3 10.1
dB
Output Return
Loss
RLout
12.1 12.5 10.1
dB
Reverse Isolation
IRev
25.7 24.7 24.0
dB
Input P1dB
IP1dB
-8.1
dBm
Output P1dB
OP1dB
5.3
dBm
Input IP3
IIP3
6.5
dBm
Output IP3
OIP3
20.9
dBm
Stability
k
>1.2
--
Technical Report, TR154
5
5.5
1.2
Note/Test Condition
GHz
6
4 / 13
0.45dB loss of SMA connectors and PCB
Substracted
0.25dB loss of SMA connectors and PCB
included
[email protected]: -30dBm
[email protected]
[email protected]: -30dBm @5.5/5.501GHz
∆f =1MHz
Stability measured from 100MHz to 10GHz
11 November 2009
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
3
Description
This Technical report provides the results of LNA using the BFP720 from Infineon
Technologies for WLAN 5-6GHz applications.
This Low Noise Amplifier brings a gain of about 14dB between the frequency Range of
5-6GHz with a noise figure of 1.15dB (SMA connectors and PCB losses of 0.25dB included).
Furthermore, this device provides an unconditional stability from 100MHz up to 10GHz. The
circuit is matched with an input return loss of better than 10.0dB. The LNA brings a matching
of 10.1dB at the output.
At the frequency of 5.5GHz, using two tones spacing by 1MHz, the output third-order
intercept point reaches 20.9dBm. Besides we obtain an input -1dB compression point of
-8.1dBm.
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Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
4
Schematics
Figure 4-1: Schematics of the BFP720 for 5-6GHz WLAN Application
Table 2 : Bill of Materials
Symbol
Value
Unit
Size
Supplier
L1
3.4
nH
0402
Murata LQW15A
C1
3
pF
0402
Various
Input matching/DC block
C2
33
nF
0402
Various
HF to ground
C3
1
pF
0402
Various
Input matching
C4
33
nF
0402
Various
HF to ground
C5
1
pF
0402
Various
Output matching/DC block
R1
27
Ω
0402
Various
Biasing Voltage Setting
R2
43
kΩ
0402
Various
Base current setting
R3
0
Ω
0402
Various
Not used, jumper
R4
51
Ω
0402
Various
Output matching/stability
R5
2.2
Ω
0402
Various
Output matching/stability
SOT343
Infineon
SiGe MMIC LNA BFP720
Q1
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Comment
Input matching/DC feed to base
11 November 2009
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
5
Measured Graphs
Transducer Power Gain
30
5000 MHz
14.9 dB
20
6000 MHz
13.84 dB
10
0
5500 MHz
14.44 dB
-10
-20
-30
-40
0
1000
2000
3000
4000
Frequency (MHz)
5000
6000
7000
Figure 5-1: Power Gain of the BFP720 for WLAN 5-6GHz
Input Matching
0
-5
6000 MHz
-10.14 dB
5000 MHz
-10.2 dB
-10
-15
5500 MHz
-10.31 dB
-20
-25
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-2: Input Matching of the BFP720 for WLAN 5-6GHz
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11 November 2009
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
Output Matching
0
-5
6000 MHz
-10.1 dB
5000 MHz
-12.08 dB
-10
-15
5500 MHz
-12.46 dB
-20
-25
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-3: Output Matching of the BFP720 for WLAN 5-6GHz
Reverse Isolation
50
45
40
5000 MHz
25.66
35
30
5500 MHz
24.69
6000 MHz
24.02
25
20
15
10
5
0
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-4: Reverse Isolation of the BFP720 for WLAN 5-6GHz
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Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
Stability K Factor
5
4
3
10000 MHz
1.205
2
1
0
0
1000
2000
3000
4000 5000 6000
Frequency (MHz)
7000
8000
9000 10000
Figure 5-5: Stability K-Factor of the BFP720 for WLAN 5-6GHz
Stability Mu factor
2
Mu2 factor
Mu1 factor
1.5
1
10 MHz
1.002
0.5
0
10
2010
4010
6010
Frequency (MHz)
8010
10000
Figure 5-6: Stability Mu-Factor of the BFP720 for WLAN 5-6GHz
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Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
Figure 5-7: 3rd Order Intercept Point of the BFP720 for WLAN 5-6GHz
Figure 5-8: Input Power at 1dB compression point of the BFP720 for WLAN 5-6GHz
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11 November 2009
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
Noise figure
2
dB
5500
1.182
5000
1.2
1.5
6000
1.147
1
0.5
0
5000
5250
5500
MHz
5750
6000
Figure 5-9: Noise Figure of the BFP720 for WLAN 5-6GHz
Z Parameters Input output matching
2.
0
0.
4
6000 MHz
r 0.715892
x 0.475536
0
3.
0
4.
5.0
2
-0.
-1.0
-0.8
.0
-2
-3
.0
-0
.6
10.0
-4
.0
-5.
0
5000 MHz
r 0.60393
x 0.0527962
.4
-0
10.0
5.0
4.0
5500 MHz
r 0.708555
x 0.292511
3.0
2.0
1.0
0.8
6000 MHz
r 0.826792
x 0.572492
0.6
0.4
5500 MHz
r 0.590168
x 0.272277
0.2
0.2
0
1.0
0.8
6
0.
S22
5000 MHz
r 0.533696
x 0.089137
Swp Max
6000MHz
-10.0
S11
Swp Min
5000MHz
Figure 5-10: Input and Output Impedance of the BFP720 for WLAN 5-6GHz
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11 November 2009
Technical Report TR154
LNA using BFP720 for WLAN 5-6GHz Application
6
Evaluation Board and layout Information
Figure 6-1: PCB picture of the BFP720 for WLAN 5-6GHz LNA
Figure 6-2: Layout Information
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11 November 2009
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Published by Infineon Technologies AG
TR154