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BFP843ESD SiGe:C Ultra Low Noise RF Transistor in Dual ...RF and Protection Devices BFP843...
Transcript of BFP843ESD SiGe:C Ultra Low Noise RF Transistor in Dual ...RF and Protection Devices BFP843...
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RF and Protect ion Devices
BFP843
Appl icat ion Note AN312 Revision: Rev. 1.0
2013-03-14
BFP843 SiGe:C Ul tra Low Noise RF Transistor in Dual -Band 2.4 - 2.5 GHz & 5 - 6 GHz WiFi / WLAN Appl icat ion
(For 802.11a / b / g / n / ac Wireless LAN Applications)
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Edition 2013-03-14
Published by Infineon Technologies AG 81726 Munich, Germany
© 2013 Infineon Technologies AG All Rights Reserved.
Legal Disclaimer
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Information
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Application Note AN312, Rev. 1.0 2013-03-14 3 / 22
Application Note AN312
Revision History: 2013-03-14
Previous Revision: No previous revision
Page Subjects (major changes since last revision)
Trademarks of Infineon Technologies AG
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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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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications List of Content, Figures and Tables
Application Note AN312, Rev. 1.0 2013-03-14 4 / 22
Table of Content
1 Introduction ........................................................................................................................................ 5 1.1 About Wi-Fi® /Wireless LAN (WLAN) ................................................................................................... 5
2 BFP843 Overview ............................................................................................................................... 7 2.1 Features ............................................................................................................................................... 7 2.2 Key Applications of BFP843 ................................................................................................................. 7
3 BFP843 as Dual-Band LNA for 2.4 – 2.5 and 5.0 – 6.0 GHz Wireless LAN Applications ............. 8 3.1 Description ........................................................................................................................................... 8 3.2 Performance Overview ......................................................................................................................... 9 3.3 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 Dual-Band Wi-Fi® Wireless LAN at 2.4 - 2.5 GHz and 5 - 6 GHz ....................................................... 6 Figure 2 BFP843 in SOT343 .............................................................................................................................. 7 Figure 3 Package and pin connections of BFP843 in Topview .......................................................................... 8 Figure 4 Schematic Diagram of the Application Circuit .................................................................................... 10 Figure 5 Wideband Insertion Power Gain of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 ......... 11 Figure 6 Reverse Isolation of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 ................................ 11 Figure 7 Noise Figure of BFP843 for 2.4 – 2.5 GHz ........................................................................................ 12 Figure 8 Noise Figure of BFP843 for 5 – 6 GHz .............................................................................................. 12 Figure 9 Input Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 .................................... 13 Figure 10 Input Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 (Smith Chart) .............. 13 Figure 11 Output Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 .................................. 14 Figure 12 Output Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 (Smith Chart) ........... 14 Figure 13 Plot of Broadband Stability k Factor ................................................................................................... 15 Figure 14 Plot of Broadband Stability µ Factor .................................................................................................. 15 Figure 15 Input 1dB Compression Point of BFP843 Dual-Band WLAN LNA at 2400 MHz ............................... 16 Figure 16 Input 1dB Compression Point of BFP843 Dual-Band WLAN LNA at 5500 MHz ............................... 16 Figure 17 Output 3rd Order Intercept Point of Dual-Band WLAN LNA with BFP843 (at 2.4 GHz) ..................... 17 Figure 18 Output 3rd Order Intercept Point of Dual-Band WLAN LNA with BFP843 (at 5.5 GHz) ..................... 17 Figure 19 OFF-Mode (Vcc = 0V, Icc = 0mA) S21 of Dual-Band WLAN LNA with BFP843 ............................... 18 Figure 20 Photo Picture of Evaluation Board of Dual-Band WLAN LNA with BFP843 ...................................... 19 Figure 21 Zoom-In of Photo Picture ................................................................................................................... 19 Figure 22 Layout Proposal for RF Grounding of the 2.4 – 6 GHz WLAN LNA with BFP843 ............................. 20 Figure 23 PCB Layer Information ....................................................................................................................... 20
List of Tables
Table 1 Summary of Measurement Results ...................................................................................................... 9 Table 2 Bill-of-Materials ................................................................................................................................... 10
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BFP843 Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Introduction
Application Note AN312, Rev. 1.0 2013-03-14 5 / 22
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-
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 input-
Multiple output) and 40 MHz channels. With this, data rates up to 600Mbps (for 4 streams)
can be achieved in the 5GHz 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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BFP843 Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
Introduction
Application Note AN312, Rev. 1.0 2013-03-14 6 / 22
Rxg
Rxa
Txg
Txa5 GHz PA
2.4 GHz LNA
5 GHz LNASPDT
Switch
Rx Diplexer
Tx Diplexer
Transceiver
IC
Power
Detector
ESD
Diode
2.4 GHz PA
Dual-Band WLAN:
2.4 – 6 GHz
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-to-
noise 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 co-
existing 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 RF-
switches, TVS-diodes for ESD protection and RF Schottky diodes for power detection for
WLAN.
http://www.infineon.com/rfswitcheshttp://www.infineon.com/rfswitcheshttp://www.infineon.com/tvsdiodeshttp://www.infineon.com/schottkydiodes
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BFP843 Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
BFP843 Overview
Application Note AN312, Rev. 1.0 2013-03-14 7 / 22
2 BFP843 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 = 1.0 dB at 2.4 GHz and 1.2
dB at 5.5 GHz, 1.8 V, 8 mA
• High gain |S21|2 = 21.5 dB at 2.4 GHz and 15.5 dB
at 5.5 GHz, 1.8 V, 15 mA
• OIP3 = 23 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
• Qualification report according to AEC-Q101 available
Figure 2 BFP843 in SOT343
2.2 Key Applications of BFP843
As Low Noise Amplifier (LNA) in:
• Wireless Communications: 2.4GHz 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
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications BFP843 as Dual-Band LNA for 2.4 – 2.5 and 5.0 – 6.0 GHz Wireless LAN Applications
Application Note AN312, Rev. 1.0 2013-03-14 8 / 22
3 BFP843 as Dual-Band LNA for 2.4 – 2.5 and 5.0 – 6.0 GHz Wireless LAN Applications
3.1 Description
BFP843 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. BFP843 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 BFP843 is housed in low-height 1.1mm SOT343 package specially fitting into modules. It
is also available in other packages, e.g. BFR843EL3 in TSLP-3-9 and BFP843F in TSFP-4-1
package.
The BFP843 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 3 shows the pin assignment of package of BFP843 in the top view:
XYs
1 4
2 3
BFPXXX
B
E
E
C
Figure 3 Package and pin connections of BFP843 in Topview
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications BFP843 as Dual-Band LNA for 2.4 – 2.5 and 5.0 – 6.0 GHz Wireless LAN Applications
Application Note AN312, Rev. 1.0 2013-03-14 9 / 22
3.2 Performance Overview
Device: BFP843
Application: Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications
PCB Marking: BFP843 SOT343 M130130
(designed for 0402 SMD)
Table 1 Summary of Measurement Results
Parameter Symbol Value Unit Note/Test Condition
DC Voltage VCC 3.0 V
DC Current ICC 13.8 mA
Frequency Range Freq 2400 2500 5100 5500 5900 MHz
Gain (On Mode) GON 19.6 19.4 15.3 14.7 14.2 dB
Gain (Off Mode) GOFF -21.6 -21.7 -27.3 -31.6 -41.5 dB
Noise Figure NF 1.06 1.08 1.34 1.36 1.35 dB
SMA and PCB losses
(0.05 dB @ 2.4 GHz, 0.1 dB
@ 5 GHz) are subtracted
Input Return Loss RLin 12.0 12.1 25.0 21.4 16.7 dB
Output Return Loss RLout 18.1 17.5 28.4 21.0 15.8 dB
Reverse Isolation IRev 27.5 27.6 25.8 25.0 24.3 dB
Input P1dB (On Mode)
IP1dBON -12.3 -12.5 -8.4 -8.4 -7.4 dBm
Output P1dB (On Mode)
OP1dBON 6.3 5.9 5.9 5.3 5.8 dBm
Input IP3 IIP3 -2.1 -3.0 1.4 1.3 1.3 dBm
Output IP3 OIP3 17.6 17.0 16.7 16.1 15.2 dBm Power @ Input: -25 dBm
Stability k > 1 -- Stability measured from 10MHz to 15GHz
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications BFP843 as Dual-Band LNA for 2.4 – 2.5 and 5.0 – 6.0 GHz Wireless LAN Applications
Application Note AN312, Rev. 1.0 2013-03-14 10 / 22
3.3 Schematics and Bill-of-Materials
Total Component Count = 7
Inductors = 1 (LQG)
Resistors = 3
Capacitors = 3
Q1: BFP843J1
RF Port1
INPUT
I = ~13.0 mA
R215 KΩ
R1100 Ω
Vcc
= 3.0 V
J3DC Connector
J2
RF Port2
OUTPUTC1
6.8 pF
L15.1 nH
C2
6.8 pF
PCB = BFP843 SOT343 M130130
Layer spacing (top RF to internal ground plane): 0.2 mm
All passives are “0402“ case size
Inductors: LQG
Capacitors: various
C333 pF
R30 Ω
Figure 4 Schematic Diagram of the Application Circuit
Table 2 Bill-of-Materials
Symbol Value Unit Size Manufacturer Comment
C1 6.8 pF 0402 Various Input DC block
C2 6.8 pF 0402 Various Output DC block
C3 33 pF 0402 Various RF decoupling / blocking cap
L1 5.1 nH 0402 LQG RF decoupling / Output matching
R1 100 Ω 0402 Various DC biasing
R2 15 kΩ 0402 Various DC biasing
R3 0 Ω 0402 Various Jumper
Q1 SOT343 Infineon Technologies BFP843 SiGe:C Heterojunction
Bipolar RF Transistor
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 11 / 22
4 Measurement Graphs
100 2100 4100 6100 8100 10000
Frequency (MHz)
Insertion Power Gain InBand
0
5
10
15
20
25
5900 MHz14.2 dB
5100 MHz15.3 dB
5500 MHz14.7 dB
2400 MHz19.6 dB
2500 MHz19.4 dB
Figure 5 Wideband Insertion Power Gain of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843
100 2100 4100 6100 8100 10000
Frequency (MHz)
Reverse Isolation
-40
-30
-20
-10
0
5900 MHz-24.3 dB
5500 MHz-25 dB
5100 MHz-25.8 dB
2500 MHz-27.6 dB
2400 MHz-27.5 dB
Figure 6 Reverse Isolation of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 12 / 22
2400 2420 2440 2460 2480 2500
Frequency (MHz)
Noise Figure_2G4_2G5
0
0.5
1
1.5
2
NF
(dB
)
2500 MHz1.08 dB
2400 MHz1.06 dB
Figure 7 Noise Figure of BFP843 for 2.4 – 2.5 GHz
5000 5200 5400 5600 5800 6000
Frequency (MHz)
Noise Figure_5G_6G
0
0.5
1
1.5
2
NF
(dB
)
5900 MHz1.35 dB
5500 MHz1.36 dB
5100 MHz1.34 dB
Figure 8 Noise Figure of BFP843 for 5 – 6 GHz
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 13 / 22
0 2000 4000 6000 8000 10000
Frequency (MHz)
Input Matching
-30
-25
-20
-15
-10
-5
0
5900 MHz-16.7 dB
5500 MHz-21.4 dB
5100 MHz-25 dB
2500 MHz-12.1 dB
2400 MHz-12 dB
Figure 9 Input Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843
0 1.0
1.0
-1.0
10.0
10.0
-10.0
5.0
5.0
-5.0
2.0
2.0
-2.0
3.0
3.0
-3.0
4.0
4.0
-4.0
0.2
0.2
-0.2
0.4
0.4
-0.4
0.6
0.6
-0.6
0.8
0.8
-0.8
Input Matching SmithSwp Max
7000MHz
Swp Min
2000MHz
5500 MHzr 1.01705x 0.1706
2400 MHzr 0.759141x -0.382397
Figure 10 Input Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 (Smith Chart)
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 14 / 22
0 2000 4000 6000 8000 10000
Frequency (MHz)
Output Matching
-30
-25
-20
-15
-10
-5
0
5900 MHz-15.8 dB
5500 MHz-21 dB
5100 MHz-28.4 dB
2500 MHz-17.5 dB
2400 MHz-18.1 dB
Figure 11 Output Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843
0 1.0
1.0
-1.0
10.0
10.0
-10.0
5.0
5.0
-5.0
2.0
2.0
-2.0
3.0
3.0
-3.0
4.0
4.0
-4.0
0.2
0.2
-0.2
0.4
0.4
-0.4
0.6
0.6
-0.6
0.8
0.8
-0.8
Output Matching SmithSwp Max
7000MHz
Swp Min
2000MHz
5500 MHzr 1.03386x 0.179201
2400 MHzr 1.13926x -0.228552
Figure 12 Output Matching of the 2.4 – 2.5 GHz & 5 – 6 GHz WLAN LNA with BFP843 (Smith Chart)
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 15 / 22
0 5000 10000 15000
Frequency (MHz)
Stability k Factor
0
0.5
1
1.5
2
Figure 13 Plot of Broadband Stability k Factor
100 5100 10100 15000
Frequency (MHz)
Stability Mu Factor
0
0.5
1
1.5
2
2.5
Mu2 factor
Mu1 factor
Figure 14 Plot of Broadband Stability µ Factor
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 16 / 22
-30 -20 -10 0
Pin (dBm)
Input 1dB Compression Point_2G4
0
5
10
15
20
Gain
(dB
)
-12.3 dBm18.65 dB
-30 dBm19.65 dB
Figure 15 Input 1dB Compression Point of BFP843 Dual-Band WLAN LNA at 2400 MHz
-30 -25 -20 -15 -10 -5 0
Pin (dBm)
Input 1dB Compression Point_5G5
0
5
10
15
20
Gain
(dB
)
-8.37 dBm13.79 dB
-30 dBm14.79 dB
Figure 16 Input 1dB Compression Point of BFP843 Dual-Band WLAN LNA at 5500 MHz
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 17 / 22
2398.5 2399.5 2400.5 2401.5 2402.5
Frequency (MHz)
Output 3rd Order Intercept Point_2G4
-100
-80
-60
-40
-20
0
Po
we
r (d
Bm
) 2402 MHz-50.5
2400 MHz-5.28
2399 MHz-51.1
2401 MHz-5.28
Figure 17 Output 3rd
Order Intercept Point of Dual-Band WLAN LNA with BFP843 (at 2.4 GHz)
5897 5898 5899 5900 5901 5902
Frequency (MHz)
Output 3rd Order Intercept Point_5G9
-100
-80
-60
-40
-20
0
Po
we
r (d
Bm
)
5901 MHz-63.5
5900 MHz-10.7
5898 MHz-63.6
5899 MHz-11.1
Figure 18 Output 3rd
Order Intercept Point of Dual-Band WLAN LNA with BFP843 (at 5.5 GHz)
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs
Application Note AN312, Rev. 1.0 2013-03-14 18 / 22
0 2000 4000 6000 8000 10000
Frequency (MHz)
OFF Mode S21
-60
-50
-40
-30
-20
-10
2500 MHz-21.7 dB
5900 MHz-41.5 dB
5500 MHz-31.6 dB
5100 MHz-27.3 dB
2400 MHz-21.6 dB
Figure 19 OFF-Mode (Vcc = 0V, Icc = 0mA) S21 of Dual-Band WLAN LNA with BFP843
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Evaluation Board and Layout Information
Application Note AN312, Rev. 1.0 2013-03-14 19 / 22
5 Evaluation Board and Layout Information
Figure 20 Photo Picture of Evaluation Board of Dual-Band WLAN LNA with BFP843
Figure 21 Zoom-In of Photo Picture
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Evaluation Board and Layout Information
Application Note AN312, Rev. 1.0 2013-03-14 20 / 22
0.4 mm
0.4 mm
0.4 mm
0.3 mm via diameter
0.4 mm
Figure 22 Layout Proposal for RF Grounding of the 2.4 – 6 GHz WLAN LNA with BFP843
Figure 23 PCB Layer Information
Copper
35µm
FR4 Core, 0.2mm
FR4 Prepreg, 0.8mm
Vias
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BFP843
Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Authors
Application Note AN312, Rev. 1.0 2013-03-14 21 / 22
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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w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG AN312