BF R84 3E L3
BF R84 3E L3 Si Ge: C Ult ra Lo w Nois e
RF Tra nsi stor i n Du al -B and 2. 4 - 2.5
G Hz & 5 - 6 G Hz W i Fi / WL AN
Applic atio n
(For 802.11a / b / g / n / ac Wireless LAN Applications)
Applic atio n N ote A N 307
Revision: Rev. 1.0
2013-02-28
RF and P r otecti on D evic es
Edition 2013-02-28
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2013 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
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BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Application Note AN307
Revision History: 2013-02-28
Previous Revision: No previous revision
Page
Subjects (major changes since last revision)
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™,
CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, EasyPIM™, EconoBRIDGE™, EconoDUAL™,
EconoPIM™, EconoPACK™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™,
ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™,
POWERCODE™, PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™,
ReverSave™, SatRIC™, SIEGET™, SINDRION™, SIPMOS™, SmartLEWIS™, SOLID FLASH™,
TEMPFET™, thinQ!™, TRENCHSTOP™, TriCore™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by
AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum.
COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™
of Epcos AG. FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium.
HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™
of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR
STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc.
MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS
Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of
Applied Wave Research Inc., OmniVision™ of OmniVision Technologies, Inc. Openwave™ Openwave Systems
Inc. RED HAT™ Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc.
SOLARIS™ of Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software
Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc.
TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™
of Cadence Design Systems, Inc. VLYNQ™ of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™
of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex Limited.
Last Trademarks Update 2011-11-11
Application Note AN307, Rev. 1.0
3 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
List of Content, Figures and Tables
Table of Content
1
1.1
Introduction ........................................................................................................................................ 5
®
About Wi-Fi /Wireless LAN (WLAN) ................................................................................................... 5
2
2.1
2.2
BFR843EL3 Overview ........................................................................................................................ 7
Features ............................................................................................................................................... 7
Key Applications of BFR843EL3 .......................................................................................................... 7
3
3.1
3.2
3.3
BFR843EL3 as Dual-Band LNA for 2.4 – 2.5 GHz and 5.0 – 6.0 GHz Wireless LAN Applications8
Description ........................................................................................................................................... 8
Performance Overview ......................................................................................................................... 9
Schematics and Bill-of-Materials ........................................................................................................ 10
4
Measurement Graphs ...................................................................................................................... 11
5
Evaluation Board and Layout Information .................................................................................... 19
6
Authors .............................................................................................................................................. 21
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Dual-Band Wi-Fi® Wireless LAN at 2.4 - 2.5 GHz and 5 - 6 GHz ....................................................... 6
BFR843EL3 in TSLP-3-9 ..................................................................................................................... 7
Package and pin connections of BFR843EL3 in Topview ................................................................... 8
Schematic Diagram of the Application Circuit .................................................................................... 10
Wideband Insertion Power Gain of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with
BFR843EL3 ........................................................................................................................................ 11
Reverse Isolation of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3 ..... 11
Noise Figure of 2.4 – 2.5 GHz WLAN LNA with BFR843EL3 ........................................................... 12
Noise Figure of 5 – 6 GHz WLAN LNA with BFR843EL3 ................................................................. 12
Input Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3 ......... 13
Input Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3 (Smith
Chart) ................................................................................................................................................. 13
Output Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3....... 14
Output Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3
(Smith Chart) ...................................................................................................................................... 14
Wideband Stability k Factor of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with
BFR843EL3 ........................................................................................................................................ 15
Wideband Stability µ Factor of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with
BFR843EL3 ........................................................................................................................................ 15
Input 1dB Compression Point of the BFR843EL3 Circuit at 2400 MHz ............................................. 16
Input 1dB Compression Point of the BFR843EL3 Circuit at 5500 MHz ............................................. 16
rd
Output 3 Order Intercept Point of 2.4 GHz WLAN LNA with BFR843EL3 ....................................... 17
rd
Output 3 Order Intercept Point of 5 – 6 GHz WLAN LNA with BFR843EL3 (Measured @ 5.5 GHz)17
OFF-Mode (Vcc = 0V, Icc = 0mA) S21 of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA
with BFR843EL3 ................................................................................................................................ 18
Photo Picture of Evaluation Board for LNA with BFR843EL3 ............................................................ 19
Zoom-In of Photo Picture ................................................................................................................... 19
Layout Proposal for RF Grounding of the 2.4 – 6 GHz WLAN LNA with BFR843EL3 ...................... 20
PCB Layer Information ....................................................................................................................... 20
List of Tables
Table 1
Table 2
Summary of Measurement Results ...................................................................................................... 9
Bill-of-Materials................................................................................................................................... 10
Application Note AN307, Rev. 1.0
4 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Introduction
1
Introduction
1.1
About Wi-Fi® /Wireless LAN (WLAN)
The Wi-Fi® function is one of the most important connectivity functions in notebooks, smart
phones and tablet PCs. Wi-Fi is a registered trademark made of the Wi-Fi Alliance created to
certify devices for Wireless LAN (WLAN) applications based on the IEEE 802.11 standard.
The WLAN standard has evolved over the years from its legacy systems known as 802.111997, through 802.11a, b, g, and n, to the newest 802.11ac. Today the trend is rapidly
changing where Wi-Fi is not only used for high data rate access to internet but also for
content consumption such as streaming music and High Definition (HD) video on TVs, smart
phones, tablets, game consoles etc.
With the requirements on high speed, high quality wireless data transfer wireless data quality
becoming more stringent than ever, the new Wireless LAN standards are being developed by
using higher order modulation schemes, wider channels and multiple data streams.
Wi-Fi according to IEEE802.11b/g/n at 2.4 GHz widely implemented over years suffers from
the interference from other devices such as cordless phones, microwave ovens, Bluetooth
devices etc. in the 2.4 GHz spectrum. 802.11a/n operating at 5 GHz has less interference
and can transmit data at greater speeds (54 Mbps) but at the cost of reduced range. 802.11n
provides enhanced performance and range over prior 802.11 technologies by operating in
both the 2.4 GHz and 5 GHz. It introduces the advanced technique, Multiple Input-Multiple
Output (MIMO) and operates with a channel bandwidth of 40 MHz. With this, data rates up to
600Mbps (for 4 streams) can be achieved in the 5 GHz band. To cater to these high
throughput requirements, major performance criteria have to be fulfilled: sensitivity, strong
signal capability and interference immunity.
The Figure 1 shows one example of general block diagram of a dual band WLAN system.
Application Note AN307, Rev. 1.0
5 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Introduction
2.4 GHz LNA
Dual-Band WLAN:
2.4 – 6 GHz
Rx Diplexer
Rxg
Rxa
SPDT
Switch
5 GHz LNA
Txg
Transceiver
IC
2.4 GHz PA
ESD
Diode
Tx Diplexer
Power
Detector 5 GHz PA
Figure 1
Txa
Dual-Band Wi-Fi® Wireless LAN at 2.4 - 2.5 GHz and 5 - 6 GHz
A Wi-Fi router has to receive relatively weak signals from Wi-Fi enabled devices such as
mobile phones. Therefore, it should have high sensitivity to detect a weak signal in the
presence of strong interfering signals. We can improve the sensitivity of the receiver by using
a low noise amplifier (LNA) as a first block of the receiver front end to improve the Signal-toNoise Ratio (SNR) of the overall system. As an example, an increase in the sensitivity by 5
dB corresponds to nearly double link distance.
WLAN systems are subject to co-channel interference and also interference from strong coexisting cellular signals. High linearity characteristics such as 3rd-order intercept point (IP3)
and 1dB compression point (P1dB) are required to improve an application's ability to
distinguish between desired signals and spurious signals received close together. This
avoids saturation, degradation of the gain and increased noise figure.
This application note is focusing on the LNA block, but Infineon does also support with RFswitches, TVS-diodes for ESD protection and RF Schottky diodes for power detection for
WLAN.
Application Note AN307, Rev. 1.0
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2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
BFR843EL3 Overview
2
BFR843EL3 Overview
2.1
Features
• Low noise broadband NPN RF transistor based on
Infineon´s reliable, high volume SiGe:C bipolar
technology
• High maximum RF input power and ESD robustness
• Unique combination of high RF performance,
robustness and ease of use
• Low noise figure: NFmin = 0.95 dB at 2.4 GHz and
1.1 dB at 5.5 GHz, 1.8 V, 8 mA
2
• High gain |S21| = 21.5 dB at 2.4 GHz and 16.5 dB
at 5.5 GHz, 1.8 V, 15 mA
• OIP3 = 22 dBm at 2.4 GHz and 20 dBm at 5.5 GHz,
1.8 V, 15 mA
• Ideal for low voltage applications e.g. VCC = 1.2 V
and 1.8 V (2.85 V, 3.3 V, 3.6 V requires
corresponding collector resistor)
• Low power consumption, ideal for mobile
applications
• Thin small flat Pb-free (RoHS compliant) and
halogen-free package
Figure 2
BFR843EL3 in TSLP-3-9
• Qualification report according to AEC-Q101
available
2.2
Key Applications of BFR843EL3
As Low Noise Amplifier (LNA) in:
• Wireless Communications: 2.4 GHz Wireless LAN IEEE802.11b/g/n, 5 - 6 GHz Wireless
LAN IEEE802.11a/n/ac, WiMAX
• Satellite navigation systems (e.g. GPS, GLONASS, COMPASS...) and satellite C-band
LNB (1st and 2nd stage LNA)
• Broadband amplifiers: Dualband WLAN, multiband mobile phone, UWB up to 10 GHz
• ISM bands up to 10 GHz
Application Note AN307, Rev. 1.0
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2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
BFR843EL3 as Dual-Band LNA for 2.4 – 2.5 GHz and 5.0 – 6.0 GHz Wireless LAN Applications
3
BFR843EL3 as Dual-Band LNA for 2.4 – 2.5 GHz and 5.0 – 6.0 GHz
Wireless LAN Applications
3.1
Description
BFR843EL3 is a discrete SiGe:C hetero-junction bipolar transistor (HBT) specifically
designed for high performance dual band 2- 6 GHz band low noise amplifier (LNA) solutions
for Wi-Fi connectivity applications. This has been developed using Infineon’s latest B9HFM
technology. The key features of this technology are very high transition frequency (fT = 80
GHz) and low parasitics, which enable to achieve higher gain and lower noise figure
compared to the previous generation RF transistor BFR740L3RH. BFR843EL3 features an
integrated on-chip R-C feedback network. The negative feedback reduces the effects of
performance variations of the amplifier. The design is therefore less sensitive to variations in
PCB layout resulting in an amplifier with broader bandwidth, easier impedance matching and
improved stability margin. However the price paid for using negative feedback is slight
degradation of noise figure and decrease in gain.
The BFR843EL3 is housed in low-height 0.31mm TSLP-3-9 package specially fitting into
modules. It is also available in other packages, e.g. BFP843 in SOT343 and BFP843F in
TSFP-4-1 package.
The BFR843EL3 has an integrated 1.5 kV HBM ESD protection which makes the device
robust against electrostatic discharge and extreme RF input power. The device offers its high
performance at low current and voltage and is especially well-suited for portable battery
powered applications in which energy efficiency is a key requirement.
Figure 2 shows the pin assignment of package of BFR843EL3 in the top view:
E
3
B
Figure 3
1
2
C
Package and pin connections of BFR843EL3 in Topview
Application Note AN307, Rev. 1.0
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2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
BFR843EL3 as Dual-Band LNA for 2.4 – 2.5 GHz and 5.0 – 6.0 GHz Wireless LAN Applications
3.2
Performance Overview
Device:
BFR843EL3
Application:
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
PCB Marking: BFR843EL3 M130129
(designed for 0201 SMD)
Table 1
Summary of Measurement Results
Parameter
Symbol
Value
Unit
DC Voltage
VCC
3.0
V
DC Current
ICC
12.2
mA
Frequency Range
Freq
2400
2500
5100
5500
5900
MHz
Gain (On Mode)
GON
18.5
18.2
13.7
13.3
13
dB
Gain (Off Mode)
GOFF
-20.3
-20.5
-26.0
-29.2
-36.2
dB
Note/Test Condition
Vcc = 0V, Icc = 0mA
SMA and PCB losses
(0.07 dB @ 2.4 GHz, 0.12 dB
@ 5 GHz) are subtracted
Noise Figure
NF
1.0
1.0
1.25
1.35
1.3
dB
Input Return Loss
RLin
12.4
12.6
17.5
20.8
24.9
dB
Output Return Loss
RLout
20.0
18.6
12.9
14.3
16.4
dB
Reverse Isolation
IRev
25.8
25.8
22.6
21.8
20.9
dB
Input P1dB
(On Mode)
IP1dBON
-12
-12.1
-7.8
-7.5
-6.2
dBm
Output P1dB
(On Mode)
OP1dBON
5.5
5.5
4.9
4.9
4.8
dBm
Input IP3
IIP3
-1.1
-1.9
1.2
2.8
3.3
dBm
Output IP3
OIP3
17.4
16.2
14.9
16.1
16.2
dBm Power @ Input: -25 dBm
Stability
k
Application Note AN307, Rev. 1.0
>1
9 / 22
--
Stability measured from
10MHz to 10GHz
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
BFR843EL3 as Dual-Band LNA for 2.4 – 2.5 GHz and 5.0 – 6.0 GHz Wireless LAN Applications
3.3
Schematics and Bill-of-Materials
Vcc= 3.0 V
All passives are “0201“ case size
Inductors: LQP03T
Capacitors: various
J3
DC Connector
I = ~12.0 mA
R3
0Ω
R1
100 Ω
C3
33 pF
R2
18 KΩ
L1
4.3 nH
J1
RF Port1
INPUT
C2
Q1: BFR843EL3
C1
J2
RF Port2
OUTPUT
2.2 pF
6.8 pF
Total Component Count = 7
PCB = BFR843EL3 M130129
Layer spacing (top RF to internal ground plane): 0.2 mm
Figure 4
Table 2
Inductors = 1 (LQP03T)
Resistors = 3
Capacitors = 3
Schematic Diagram of the Application Circuit
Bill-of-Materials
Symbol
Value
Unit
Size
Manufacturer
Comment
C1
6.8
pF
0201
Various
Input DC block & input matching
C2
2.2
pF
0201
Various
Output DC block
C3
33
pF
0201
Various
L1
4.3
nH
0201
LQP03T
RF decoupling /DC blocking cap
RF decoupling / Output matching
R1
100
Ω
0201
Various
DC biasing
R2
18
kΩ
0201
Various
DC biasing
R3
0
Ω
0201
Various
Jumper
TSLP-3-9
Infineon Technologies
Q1
Application Note AN307, Rev. 1.0
10 / 22
BFR843EL3 SiGe:C Heterojunction
Bipolar RF Transistor
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
4
Measurement Graphs
Insertion Power Gain WideBand
25
20
5100 MHz
13.7 dB
2400 MHz
18.5 dB
15
5900 MHz
12.9 dB
2500 MHz
18.2 dB
10
5500 MHz
13.3 dB
5
0
100
Figure 5
2100
4100
6100
Frequency (MHz)
8100
10000
Wideband Insertion Power Gain of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA
with BFR843EL3
Reverse Isolation
0
-10
5100 MHz
-22.6 dB
2400 MHz
-25.8 dB
-20
5500 MHz
-21.8 dB
5900 MHz
-20.9 dB
2500 MHz
-25.8 dB
-30
-40
100
Figure 6
2100
4100
6100
Frequency (MHz)
8100
10000
Reverse Isolation of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3
Application Note AN307, Rev. 1.0
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2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
Noise Figure_2G4
2
NF(dB)
1.5
2400 MHz
1.045 dB
2500 MHz
1.038 dB
1
0.5
0
2400
Figure 7
2420
2440
2460
Frequency (MHz)
2480
2500
Noise Figure of 2.4 – 2.5 GHz WLAN LNA with BFR843EL3
Noise Figure_5G_6G
2
NF(dB)
1.5
5500 MHz
1.345 dB
5100 MHz
1.28 dB
5900 MHz
1.316 dB
1
0.5
0
5000
Figure 8
5200
5400
5600
Frequency (MHz)
5800
6000
Noise Figure of 5 – 6 GHz WLAN LNA with BFR843EL3
Application Note AN307, Rev. 1.0
12 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
Input Matching
0
-5
2500 MHz
-12.6 dB
2400 MHz
-12.39 dB
-10
5500 MHz
-20.77 dB
-15
5100 MHz
-17.51 dB
5900 MHz
-24.85 dB
-20
-25
0
Figure 9
2000
4000
6000
Frequency (MHz)
8000
10000
Input Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3
Swp Max
8000MHz
2.
0
6
0.
0.8
1.0
Input Matching Smith
0.
4
0
3.
0
4.
5.0
5500 MHz
r 0.888973
x -0.132938
2
-0.
10.0
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 10
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0.2
10.0
-4
.0
-5.
0
0
5900 MHz
r 0.893355
x -0.0189045
-10.0
0.2
2400 MHz
r 0.783141
x -0.380362
Swp Min
1500MHz
Input Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3
(Smith Chart)
Application Note AN307, Rev. 1.0
13 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
Output Matching
0
-5
5500 MHz
-14.27 dB
-10
2400 MHz
-19.97 dB
5900 MHz
-16.35 dB
-15
2500 MHz
-18.54 dB
5100 MHz
-12.9 dB
-20
-25
-30
0
Figure 11
2000
4000
6000
Frequency (MHz)
8000
10000
Output Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3
Swp Max
8000MHz
2.
0
6
0.
0.8
1.0
Output Matching Smith
0.
4
0
3.
0
4.
5.0
0.2
10.0
5.0
4.0
3.0
2400 MHz
r 1.03594
x -0.202037
2.0
1.0
0.8
0.6
0.4
0
0.2
10.0
5900 MHz
r 0.827619
x -0.220766
-10.0
2
-0.
5500 MHz
r 0.848109
x -0.329584
-4
.0
-5.
0
-3
.0
Figure 12
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Swp Min
1500MHz
Output Matching of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with BFR843EL3
(Smith Chart)
Application Note AN307, Rev. 1.0
14 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
Stability k Factor
2
1.5
1
0.5
0
0
Figure 13
2000
4000
6000
Frequency (MHz)
8000
10000
Wideband Stability k Factor of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with
BFR843EL3
Stability Mu Factor
2.5
2
1.5
1
Mu2 factor
Mu1 factor
0.5
0
100
Figure 14
2100
4100
6100
Frequency (MHz)
8100
10000
Wideband Stability µ Factor of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN LNA with
BFR843EL3
Application Note AN307, Rev. 1.0
15 / 22
2013-02-28
BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
Input 1dB Compression Point_2G4
20
-30 dBm
18.58 dB
Gain(dB)
15
-12 dBm
17.57 dB
10
5
0
-30
-20
-10
0
Pin (dBm)
Figure 15
Input 1dB Compression Point of the BFR843EL3 Circuit at 2400 MHz
Input 1dB Compression Point_5G5
20
Gain(dB)
15
-30 dBm
13.29 dB
-7.45 dBm
12.29 dB
10
5
0
-30
Figure 16
-25
-20
-15
Pin (dBm)
-10
-5
0
Input 1dB Compression Point of the BFR843EL3 Circuit at 5500 MHz
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BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
Output 3rd Order Intercept Point_2G4
0
2401 MHz
-6.53
Power (dBm)
-20
2399 MHz
-54.3
-40
-60
-80
-100
2398.5
Figure 17
2399.5
2400.5
Frequency (MHz)
2401.5
2402.5
rd
Output 3 Order Intercept Point of 2.4 GHz WLAN LNA with BFR843EL3
Output 3rd Order Intercept Point_5G5
0
5501 MHz
-11.8
Power (dBm)
-20
-40
-60
5499 MHz
-67.2
-80
-100
5498.5
Figure 18
5499.5
5500.5
Frequency (MHz)
5501.5
5502.5
rd
Output 3 Order Intercept Point of 5 – 6 GHz WLAN LNA with BFR843EL3 (Measured @ 5.5
GHz)
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BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Measurement Graphs
OFF Mode S21
-10
-20
5500 MHz
-29.2 dB
2400 MHz
-20.3 dB
-30
2500 MHz
-20.5 dB
5100 MHz
-26 dB
-40
-50
5900 MHz
-36.2 dB
-60
-70
0
Figure 19
2000
4000
6000
Frequency (MHz)
8000
10000
OFF-Mode (Vcc = 0V, Icc = 0mA) S21 of the Dual-Band (2.4 – 2.5 GHz & 5 – 6 GHz) WLAN
LNA with BFR843EL3
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BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Evaluation Board and Layout Information
5
Evaluation Board and Layout Information
Figure 20
Photo Picture of Evaluation Board for LNA with BFR843EL3
Figure 21
Zoom-In of Photo Picture
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BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Evaluation Board and Layout Information
0.2 mm
0.1mm
E
BFR843EL3
C
B
Figure 22
Layout Proposal for RF Grounding of the 2.4 – 6 GHz WLAN LNA with BFR843EL3
Vias
FR4 Core, 0.2mm
Copper
35µm
Figure 23
FR4 Prepreg,
0.8mm
PCB Layer Information
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BFR843EL3
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Authors
6
Authors
Xi Chen, Internship Student of Application Engineering of Business Unit “RF and Protection Devices”
Ahmed Shamsuddin, Application Engineer of Business Unit “RF and Protection Devices”
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2013-02-28
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Published by Infineon Technologies AG
AN307