bfp843esd sige:c ultra low noise rf transistor in dual ...rf and protection devices bfp843...

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)

Edition 2013-03-14

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 Infineon Technologies Office (www.infineon.com).

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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 sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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

BFP843

Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications List of Content, Figures and Tables


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

BFP843 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 802.11-

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.


Introduction


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


BFP843 Overview


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

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


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

BFP843



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

BFP843



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

BFP843

Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Measurement Graphs


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

BFP843



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

BFP843



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)

BFP843



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)

BFP843



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

BFP843



-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

BFP843



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)

BFP843



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

BFP843

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 of Dual-Band WLAN LNA with BFP843

Figure 21 Zoom-In of Photo Picture

BFP843

Dual-Band LNA for 2.4 - 6.0 GHz WLAN Applications Evaluation Board and Layout Information


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

BFP843

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”

w w w . i n f i n e o n . c o m

Published by Infineon Technologies AG AN312

bfp843esd sige:c ultra low noise rf transistor in dual ...rf and protection devices bfp843...

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