BDTIC

BF P843 F
BDTIC
Si Ge: C Ul tra Lo w N ois e RF T rans is t or
in D ual - B and 2 .4 - 2.5 G Hz & 5 - 6
G Hz W LA N Applic at ion
(For 802.11a / b / g / n / ac Wireless LAN Applications)
Applic atio n N ote A N 315
Revision: Rev. 1.0
2014-04-01
RF and P r o tecti on D evic es
www.BDTIC.com/infineon
BDTIC
Edition 2014-04-01
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2014 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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BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Application Note AN315
Revision History: 2014-04-01
Previous Revision: No previous revision
Page
Subjects (major changes since last revision)
BDTIC
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
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Application Note AN315, Rev. 1.0
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2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
List of Content, Figures and Tables
Table of Content
1
1.1
Introduction ........................................................................................................................................ 6
®
About Wi-Fi /Wireless LAN (WLAN) ................................................................................................... 6
2
2.1
2.2
BFP843F Overview ............................................................................................................................. 8
Features ............................................................................................................................................... 8
Key Applications of BFP843F .............................................................................................................. 8
3
3.1
BFP843F as Dual-Band LNA for 2.4 - 2.5 GHz and 5.0 - 6.0 GHz Wireless LAN Applications .... 9
Description ........................................................................................................................................... 9
4
4.1
4.2
Application Circuit and Performance Overview ............................................................................ 11
Performance Overview ....................................................................................................................... 11
Schematics and Bill-of-Materials ........................................................................................................ 12
5
Measurement Graphs ...................................................................................................................... 13
6
7
8
9
BDTIC
Evaluation Board .............................................................................................................................. 24
Layout Information ........................................................................................................................... 25
Authors .............................................................................................................................................. 26
Remark .............................................................................................................................................. 26
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
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
Figure 30
Dual-Band Wi-Fi® Wireless LAN at 2.4 - 2.5 GHz and 5 - 6 GHz ....................................................... 7
BFP843F in TSFP-4-1 .......................................................................................................................... 8
Package and pin connections of BFP843F in Topview........................................................................ 9
Schematic of the BFP843F Application Circuit .................................................................................. 12
Wideband Insertion Power Gain of the 2.4 - 2.5 GHz & 5 - 6 GHz WLAN LNA with BFP843F......... 13
Off-Mode Insertion Power Gain of the 2.4 - 2.5 GHz & 5 - 6 GHz WLAN LNA with BFP843F .......... 13
Input Matching of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz ................................................... 14
Input Matching at 2.4 – 2.5 GHz (Smith Chart, Port-Deembedded) .................................................. 14
Insertion Power Gain of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz ......................................... 15
Reverse Isolation of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz ............................................... 15
Output Matching of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz ................................................ 16
Output Matching at 2.4 – 2.5 GHz (Smith Chart, Port-Deembedded) ............................................... 16
Noise Figure of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz ...................................................... 17
Input 1dB Compression Point (IP1dB) of the WLAN LNA with BFP843F at 2450 MHz .................... 17
Output Third Order Intercept Point (OIP3) of the WLAN LNA with BFP843F at 2450 MHz .............. 18
Input Matching of the WLAN LNA with BFP843F at 5 – 6 GHz ......................................................... 18
Input Matching at 5 – 6 GHz (Smith Chart, Port-Deembedded) ....................................................... 19
Insertion Power Gain of the WLAN LNA with BFP843F at 5 – 6 GHz ............................................... 19
Reverse Isolation of the WLAN LNA with BFP843F at 5 – 6 GHz ..................................................... 20
Output Matching of the WLAN LNA with BFP843F at 5 – 6 GHz ...................................................... 20
Output Matching at 5 – 6 GHz (Smith Chart, Port-Deembedded) ..................................................... 21
Noise Figure of the WLAN LNA with BFP843F at 5 – 6 GHz ............................................................ 21
Input 1dB Compression Point (IP1dB) of the WLAN LNA with BFP843F at 5500 MHz .................... 22
Output Third Order Intercept Point (OIP3) of the WLAN LNA with BFP843F at 5500 MHz .............. 22
Stability K Factor of the 2.4 - 2.5 GHz & 5- 6 GHz WLAN LNA with BFP843F ................................. 23
Stability Mu Factor of the 2.4 - 2.5 GHz & 5- 6 GHz WLAN LNA with BFP843F ............................... 23
Photo Picture of Evaluation Board (overview) <M12051302> ........................................................... 24
Photo Picture of Evaluation Board (detailed view) ............................................................................. 24
Layout Proposal for RF Grounding of the 2.4 - 2.5 GHz & 5 - 6 GHz WLAN LNA with BFP843F .... 25
PCB Layer Information ....................................................................................................................... 25
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Application Note AN315, Rev. 1.0
4 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
List of Content, Figures and Tables
List of Tables
Table 1
Table 2
Summary of Measurement Results (at room temperature) ............................................................... 11
Bill-of-Materials................................................................................................................................... 12
BDTIC
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Application Note AN315, Rev. 1.0
5 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 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 802.11-
BDTIC
1997, 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 video on TVs, smart
phones, tablets, game consoles etc.
With the requirements on 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
interference from other devices such as cordless phones, microwave ovens, Bluetooth
devices etc. in the 2.4 GHz space. 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 adds two significant technologies: MIMO (Multiple inputMultiple output) and 40 MHz channels. 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.
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Application Note AN315, Rev. 1.0
6 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 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
Txa
BDTIC
Figure 1
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.
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Application Note AN315, Rev. 1.0
7 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
BFP843F Overview
2
BFP843F 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
• High gain |S21|2 = 21.5 dB at 2.4 GHz and 16.5 dB at 5.5 Figure 2
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 halogenfree package
• Qualification report according to AEC-Q101 available
BDTIC
2.2
BFP843F in TSFP-4-1
Key Applications of BFP843F
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
Product Name
BFP843F
Package
TSFP-4-1
1=B
Pin Configuration
2=E
3=C
4=E
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Application Note AN315, Rev. 1.0
8 / 27
Marking
T2s
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
BFP843F as Dual-Band LNA for 2.4 - 2.5 GHz and 5.0 - 6.0 GHz Wireless LAN Applications
3
BFP843F as Dual-Band LNA for 2.4 - 2.5 GHz and 5.0 - 6.0 GHz
Wireless LAN Applications
3.1
Description
BFP843F is a discrete SiGe:C hetero-junction bipolar transistor (HBT) specifically designed
for high performance dual band 2 GHz - 6 GHz band low noise amplifier (LNA) solutions for
Wi-Fi connectivity applications. This has been developed using Infineon’s latest B9HFM
BDTIC
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 BFP740FED. BFP843F 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 BFP843F is housed in flatlead TSFP-4-1 package. Other variants of this family are also
available in other packages, e.g. BFP843 in the SOT343 package and BFR843EL3 in the
leadless TSLP-3-9 package. Figure 3 shows the pin assignment of package of BFP843F in
the top view:
B 1
4 E
XYs
E
3 C
2
BFPXXXF
Figure 3
Package and pin connections of BFP843F in Topview
The BFP843F 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
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Application Note AN315, Rev. 1.0
9 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
BFP843F as Dual-Band LNA for 2.4 - 2.5 GHz and 5.0 - 6.0 GHz Wireless LAN Applications
performance at low current and voltage and is especially well-suited for portable battery
powered applications in which energy efficiency is a key requirement.
In the 2.4 GHz to 2.5 GHz frequeny band, this circuit achieves noise figure of 1.1 dB. The
gain ranges from 19.9 dB to 19.7 dB. The input return loss and output return loss is above 10
dB. At 2450MHz, the Input 1dB compression point (IP1dB) reaches -13.4 dBm. The input 3rdorder intercept point (IIP3) reaches -3.5 dBm.
As to the 5.0 GHz to 6.0 GHz frequeny band, this circuit achieves noise figure of 1.3 dB. The
gain ranges from 16.4 dB to 15.5 dB. The input return loss and output return loss is above 10
BDTIC
dB. At 5500MHz, the input 1dB compression point (IP1dB) reaches -10.2 dBm. The input 3rdorder intercept point (IIP3) reaches -0.6 dBm.
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Application Note AN315, Rev. 1.0
10 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Application Circuit and Performance Overview
4
Application Circuit and Performance Overview
Device:
BFP843F
Application:
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
PCB Marking: M12051302 BFP840FESD
4.1
Performance Overview
BDTIC
Table 1
Summary of Measurement Results (at room temperature)
Parameter
Symbol
Value
Unit
DC Voltage
VCC
3.0
V
DC Current
ICC
13.5
mA
Frequency Range
Freq
2400
2500
5100
5500
5900
MHz
Gain (On Mode)
GON
19.9
19.7
16.4
16.0
15.5
dB
Gain (Off Mode)
GOFF
-21.1
-21.5
-21.0
-21.0
-21.6
dB
Noise Figure
NF
1.1
1.1
1.3
1.3
1.3
dB
Input Return Loss
RLin
14.3
14.5
23.3
21.1
16.0
dB
Output Return Loss
RLout
10.9
10.5
13.0
16.3
21.4
dB
Reverse Isolation
IRev
27.4
27.5
27.7
27.5
27.3
dB
Input P1dB
(On Mode)
IP1dBON
-13.4
1)
-
-10.2
-
dBm
1)
f=2450MHz
Output P1dB
(On Mode)
OP1dBON
+5.3
1)
-
+4.8
-
dBm
1)
f=2450MHz
Input IP3
IIP3
2)
-3.5
-
-0.6
3)
-
dBm
Note/Test Condition
SMA and PCB losses
(0.04 dB @ 2.4 GHz, 0.14 dB
@ 5 GHz) are subtracted
Power @ Input: -25 dBm each
tone
2)
3)
Output IP3
Stability
OIP3
k
2)
+16.2
+15.5
>1
3)
f1=2450MHz, f2=2451MHz
f1=5500MHz, f2=5501MHz
Power @ Input: -25 dBm each
tone
-
dBm
--
2)
f1=2450MHz, f2=2451MHz
3)
f1=5500MHz, f2=5501MHz
Stability measured from 10
MHz to 15 GHz
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Application Note AN315, Rev. 1.0
11 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Application Circuit and Performance Overview
4.2
Schematics and Bill-of-Materials
BDTIC
Figure 4
Table 2
Schematic of the BFP843F Application Circuit
Bill-of-Materials
Symbol
Value
Unit
Size
Manufacturer
C1
6.8
pF
Various
Input matching / DC blocking
C2
1.5
pF
0402
0402
Various
Output matching / DC blocking
C3
33
pF
0402
Various
RF decoupling / blocking cap
RF decoupling / output matching
L1
3.0
nH
0402
LQG Series
R1
18
kΩ
0402
Various
R2
100
Ω
0402
Various
R0
0
Ω
0402
Various
TSFP-4-1
Infineon Technologies
Q1
Comment
DC biasing for base current
DC biasing, to stabilize the DC
current against hfe variation
Jumper
BFP843F SiGe:C Heterojunction
Bipolar RF Transistor
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Application Note AN315, Rev. 1.0
12 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
5
Measurement Graphs
Insertion Power Gain WideBand
25
2400 MHz
2500 MHz
19.9 dB
19.7 dB
20
5100 MHz
16.4 dB
15
5500 MHz
16.0 dB
5900 MHz
15.5 dB
BDTIC
10
5
0
0
5000
10000
15000
Frequency (MHz)
Figure 5
Wideband Insertion Power Gain of the 2.4 - 2.5 GHz & 5 - 6 GHz WLAN LNA with BFP843F
OFF Mode S21
0
5100 MHz
-21 dB
5500 MHz
-21 dB
5900 MHz
-21.6 dB
-20
2400 MHz
-21.1 dB
-40
2500 MHz
-21.5 dB
-60
-80
0
5000
10000
15000
Frequency (MHz)
Figure 6
Off-Mode Insertion Power Gain of the 2.4 - 2.5 GHz & 5 - 6 GHz WLAN LNA with BFP843F
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Application Note AN315, Rev. 1.0
13 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Input Matching
0
5900 MHz
-16.0 dB
-5
-10
5500 MHz
-21.1 dB
5100 MHz
-23.3 dB
-15
2400 MHz
-14.3 dB
2500 MHz
-14.5 dB
BDTIC
-20
-25
-30
0
2000
4000
6000
Frequency (MHz)
Figure 7
Input Matching of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz
Swp Max
3000MHz
2.
0
6
0.
0.8
1.0
Input Matching Smith 2G4 Band
0.
4
0
3.
0
4.
5.0
10.0
5.0
2500 MHz
r 0.757655
x -0.237202
4.0
3.0
10.0
2.0
1.0
0.6
0.4
0.2
0.2
0
0.8
2400 MHz
r 0.730808
x -0.218145
-10.0
2
-0.
-4
.0
-5.
0
-3
.0
Figure 8
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Swp Min
2000MHz
Input Matching at 2.4 – 2.5 GHz (Smith Chart, Port-Deembedded)
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Application Note AN315, Rev. 1.0
14 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Insertion Power Gain
25
20
2400 MHz
19.9 dB
15
2500 MHz
19.7 dB
10
BDTIC
5
0
2000
Figure 9
2200
2400
2600
Frequency (MHz)
2800
3000
Insertion Power Gain of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz
Reverse Isolation
0
2400 MHz
-27.4 dB
-20
2500 MHz
-27.5 dB
5100 MHz
-27.7 dB
-40
5500 MHz
-27.5 dB
5900 MHz
-27.3 dB
-60
-80
0
2000
4000
6000
Frequency (MHz)
Figure 10
Reverse Isolation of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz
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Application Note AN315, Rev. 1.0
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2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Output Matching
0
2400 MHz
-10.9 dB
-5
2500 MHz
-10.5 dB
-10
5100 MHz
-13.0 dB
-15
BDTIC
5500 MHz
-16.3 dB
-20
5900 MHz
-21.4 dB
-25
0
2000
4000
6000
Frequency (MHz)
Figure 11
Output Matching of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz
Swp Max
3000MHz
2.
0
6
0.
0.8
1.0
Output Matching Smith 2G4 Band
0.
4
0
3.
0
4.
5.0
0.2
2
-0.
10.0
-4
.0
-5.
0
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 12
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
2500 MHz
r 0.947919
x -0.621254
-10.0
0
0.2
10.0
2400 MHz
r 0.936545
x -0.580525
Swp Min
2000MHz
Output Matching at 2.4 – 2.5 GHz (Smith Chart, Port-Deembedded)
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Application Note AN315, Rev. 1.0
16 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Noise Figure 2G4 Band
1.5
NF(dB)
1
2500 MHz
1.11
2400 MHz
1.09
BDTIC
0.5
0
2400
Figure 13
2420
2440
2460
Frequency (MHz)
2480
2500
Noise Figure of the WLAN LNA with BFP843F at 2.4 – 2.5 GHz
Input 1 dB Compression Point 2G4 Band
20
-25.0 dBm
19.6
Gain (dB)
15
-13.4 dBm
18.6
10
5
-25
Figure 14
-20
-15
-10
Power_In (dBm)
-5
0
Input 1dB Compression Point (IP1dB) of the WLAN LNA with BFP843F at 2450 MHz
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Application Note AN315, Rev. 1.0
17 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Output 3rd Order Intercept Point 2450 MHz
0
2450 MHz
-5.3
2451 MHz
-5.6
Power (dBm)
-20
-40
2452 MHz
-48.2
2449 MHz
-47.8
-60
BDTIC
-80
-100
2448
Figure 15
2449
2450
2451
Frequency (MHz)
2452
2453
Output Third Order Intercept Point (OIP3) of the WLAN LNA with BFP843F at 2450 MHz
Input Matching
0
5900 MHz
-16.0 dB
-5
-10
5100 MHz
-23.3 dB
-15
2400 MHz
-14.3 dB
-20
5500 MHz
-21.1 dB
2500 MHz
-14.5 dB
-25
-30
0
2000
4000
6000
Frequency (MHz)
Figure 16
Input Matching of the WLAN LNA with BFP843F at 5 – 6 GHz
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Application Note AN315, Rev. 1.0
18 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Swp Max
6000MHz
2.
0
6
0.
0.8
1.0
Input Matching Smith 5G Band
0.
4
0
3.
0
4.
5.0
10.0
5.0
10.0
4.0
3.0
2.0
5900 MHz
r 1.09548
x 0.326742
1.0
0.8
0.6
0.2
0.2
0
0.4
5100 MHz
r 0.87015
x 0.0392148
BDTIC
-10.0
2
-0.
-4
.0
-5.
0
-3
.0
Figure 17
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Swp Min
5000MHz
Input Matching at 5 – 6 GHz (Smith Chart, Port-Deembedded)
Insertion Power Gain
25
20
5100 MHz
16.4 dB
5500 MHz
16.0 dB
5900 MHz
15.5 dB
15
10
5
0
5000
Figure 18
5200
5400
5600
Frequency (MHz)
5800
6000
Insertion Power Gain of the WLAN LNA with BFP843F at 5 – 6 GHz
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Application Note AN315, Rev. 1.0
19 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Reverse Isolation
0
2400 MHz
-27.4 dB
-20
2500 MHz
-27.5 dB
5100 MHz
-27.7 dB
-40
5500 MHz
-27.5 dB
5900 MHz
-27.3 dB
BDTIC
-60
-80
0
2000
4000
6000
Frequency (MHz)
Figure 19
Reverse Isolation of the WLAN LNA with BFP843F at 5 – 6 GHz
Output Matching
0
2400 MHz
-10.9 dB
-5
2500 MHz
-10.5 dB
-10
5100 MHz
-13.0 dB
-15
5500 MHz
-16.3 dB
-20
5900 MHz
-21.4 dB
-25
0
2000
4000
6000
Frequency (MHz)
Figure 20
Output Matching of the WLAN LNA with BFP843F at 5 – 6 GHz
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Application Note AN315, Rev. 1.0
20 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Swp Max
6000MHz
2.
0
6
0.
0.8
1.0
Output Matching Smith 5G Band
0.
4
0
3.
0
4.
5.0
10.0
5.0
4.0
10.0
3.0
2.0
1.0
0.8
0.6
0.4
0
0.2
0.2
5900 MHz
r 0.840216
x -0.0453947
BDTIC
5100 MHz
r 0.744962
x -0.325272
-10.0
-4
.0
-5.
0
-3
.0
2
-0.
Figure 21
.0
-2
Swp Min
5000MHz
-1.0
-0.8
-0
.6
.4
-0
Output Matching at 5 – 6 GHz (Smith Chart, Port-Deembedded)
Noise Figure 5G Band
1.5
5100 MHz
1.27
NF(dB)
1
5500 MHz
1.3
5900 MHz
1.33
0.5
0
5000
Figure 22
5200
5400
5600
Frequency (MHz)
5800
6000
Noise Figure of the WLAN LNA with BFP843F at 5 – 6 GHz
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Application Note AN315, Rev. 1.0
21 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Input 1 dB Compression Point 5G Band
25
Gain (dB)
20
15
-25.0 dBm -10.2 dBm
15.9
14.9
10
BDTIC
5
0
-25
Figure 23
-20
-15
-10
Power_In (dBm)
-5
0
Input 1dB Compression Point (IP1dB) of the WLAN LNA with BFP843F at 5500 MHz
Output 3rd Order Intercept Point 5500 MHz
0
Power (dBm)
-40
5501 MHz
-8.9
5500 MHz
-8.9
-20
5502 MHz
-57.7
5499 MHz
-57.7
-60
-80
-100
5498
Figure 24
5499
5500
5501
Frequency (MHz)
5502
5503
Output Third Order Intercept Point (OIP3) of the WLAN LNA with BFP843F at 5500 MHz
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Application Note AN315, Rev. 1.0
22 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Measurement Graphs
Stability k Factor
4
3
2
1313.5 MHz
1.096
BDTIC
1
0
0
5000
10000
15000
Frequency (MHz)
Figure 25
Stability K Factor of the 2.4 - 2.5 GHz & 5- 6 GHz WLAN LNA with BFP843F
Stability Mu Factor
2
1.5
1
0.5
MU1()
MU2()
0
0
5000
10000
15000
Frequency (MHz)
Figure 26
Stability Mu Factor of the 2.4 - 2.5 GHz & 5- 6 GHz WLAN LNA with BFP843F
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Application Note AN315, Rev. 1.0
23 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Evaluation Board
6
Evaluation Board
In this application note, the following PCB is used:
PCB Marking: M12051302 BFP840FESD
PCB material: <FR4>
r of PCB material: <4.3>
BDTIC
Figure 27
Photo Picture of Evaluation Board (overview) <M12051302>
Figure 28
Photo Picture of Evaluation Board (detailed view)
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Application Note AN315, Rev. 1.0
24 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Layout Information
7
Layout Information
0.2mm
B
E
BDTIC
BFP843F
C
E
0.3mm
Figure 29
Layout Proposal for RF Grounding of the 2.4 - 2.5 GHz & 5 - 6 GHz WLAN LNA with BFP843F
Vias
FR4 Core, 0.2mm
Copper
35µm
Figure 30
FR4 Prepreg,
0.8mm
PCB Layer Information
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Application Note AN315, Rev. 1.0
25 / 27
2014-04-01
BFP843F
Dual-Band LNA for 2.4 GHz & 5 GHz WLAN Applications
Authors
8
Authors
Xiang Li, Application Engineer of Business Unit “RF and Protection Devices”
Ahmed Shamsuddin, Application Engineer of Business Unit “RF and Protection Devices”
9
BDTIC
Remark
The graphs are generated with the simulation program AWR Microwave Office®.
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Application Note AN315, Rev. 1.0
26 / 27
2014-04-01
BDTIC
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Published by Infineon Technologies AG
AN315