TR141 - BFP640 WLAN LNA 5 6GHz

BF P640
High Lin e arit y BF P640 L N A f or
WLAN 5-6 G Hz Appli c ation
Technic al Rep ort T R 141
Revision: V1.0
Date: 27 July 2009
RF and protecti on d evic es
Edition 27 July 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 TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
TR141
Revision History: 27 July 2009
Previous Revision: No Revision
Page
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27 July 2009
Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
1
Overview
Device :
BFP640
Application:
High Linearity BFP640 LNA for WLAN 5-6GHz Application
PCB Marking: 740-081009 Rev A
2
Summary of Measurement Results
Table 1
Summary of Measurement Results
Parameter
Symbol
Value
Unit
Frequency Range
Freq
5-6
GHz
DC Voltage
Vcc
5
V
Icc
mA
83
mA
Gain
G
8.7
dB
[email protected]: -30dBm
Noise Figure
NF
dB
Including SMA connectors and PCB losses of
0.1dB
Input Return Loss
RLin
10.1
dB
Output Return Loss
RLout
8.8
dB
Reverse Isolation
IRev
17.6
dB
Input P1dB
IP1dB
8.8
dBm
Output P1dB
OP1dB
16.5
dBm
Input IP3
IIP3
20.1
dBm
Output IP3
OIP3
28.8
dBm
Stability
k
>1.2
--
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Note/Test Condition
[email protected]:-30dBm
[email protected]: -10dBm @5500/5501MHz
∆f =1MHz
Stability measured from 100MHz to 10GHz
27 July 2009
Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
3
Description
This Technical report provides the actual results of the LNA using the BFP640 from
Infineon Technologies for the WLAN 5-6GHz applications.
This Low Noise Amplifier brings a gain of 8.7dB minimum between the frequency
Range of 5-6GHz with a noise figure of 2.7dB (including SMA connectors and PCB losses of
0.1dB).
Furthermore, this device provides an unconditional stability from 100MHz up to 10GHz. The
circuit is matched in input and output and presents an input return loss of 10.0dB and 8.8dB
concerning the output.
At the frequency of 5500MHz, using two tones spaced of 1MHz, the output third-order
intercept point reaches 28.8dBm. Besides we obtain an input -1dB compression point of
8.8dBm.
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Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
4
Schematics
Figure 4-1: Schematics of the BFP640 for the WLAN 5-6GHz Application
Table 2 : Bill of Materials
C1
0.8
pF
0402
AVX-0402J
C2
1
nF
0402
Various
RF Bypass
C3
1
nF
0402
Various
RF Bypass
C4
0.8
pF
0402
AVX-0402J
L1
3.3
nH
0402
Murata LQP10A
Input Matching/DC Feed
L2
2.7
nH
0402
Murata LQP10A
Output Matching/DC Feed
R1
7.5
Ω
0402
various
Voltage setting
R2
6.8
kΩ
0402
various
Base current setting
R3
8
Ω
0402
various
Collector current setting
TSLP7-1
Infineon
SiGe Transistor BFP640
Q1
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Input Matching/DC Block
Output Matching/DC Block
27 July 2009
Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
5
Measured Graphs
Transducer Power Gain
25
20
5000 MHz
10.44 dB
15
5500 MHz
9.863 dB
6000 MHz
8.689 dB
10
5
0
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-1: Power Gain of the BFP640 for WLAN 5-6GHz Application
Input Matching
0
-5
-10
-15
5000 MHz
-10.09 dB
5500 MHz
-17.49 dB
-20
-25
6000 MHz
-27.92 dB
-30
-35
-40
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-2: Input Matching of the BFP640 for WLAN 5-6GHz Application
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Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
Output Matching
0
6000 MHz
-8.79 dB
-5
-10
5000 MHz
-19.4 dB
-15
5500 MHz
-12.45 dB
-20
-25
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-3: Output Matching of the BFP640 for WLAN 5-6GHz Application
Reverse Isolation
50
45
40
35
30
5000 MHz
18.81
25
5500 MHz
17.88
6000 MHz
17.6
20
15
10
4000
4500
5000
5500
6000
Frequency (MHz)
6500
7000
Figure 5-4: Reverse Isolation of the BFP640 for WLAN 5-6GHz Application
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Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
Stability
5
4
3
3837.4 MHz
1.26
2
1
0
10
1010
2010
3010
4010 5010 6010
Frequency (MHz)
7010
8010
9010 10000
Figure 5-5: Stability of the BFP640 for WLAN 5-6GHz Application
Figure 5-6: OIP3 of the BFP640 for WLAN 5-6GHz Application
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Technical Report TR141
High Linearity BFP640 LNA for WLAN 5-6GHz Application
6
Evaluation Board and layout Information
Figure 6-1: PCB picture of the BFP640 for WLAN 5-6GHz Application
Figure 6-2: Layout Information
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Published by Infineon Technologies AG
TR141