AN323 - Infineon

BF P760
High L ine arit y Lo w Nois e A mpl ifie r
for 5 -6 G Hz W LA N wit h 1 3d B Gai n
and O n -o f f Mo de D elta G ain 22.5 d B
using Inte rnal Dio de of T rans i s tor
Applic atio n N ote A N 323
Revision: Rev.1.0
2013-07-12
RF and P r otecti on D evic es
Edition 2013-07-12
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2013 Infineon Technologies AG
All Rights Reserved.
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BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Note AN323
Revision History: 2013-07-12
Previous Revision:
Page
Subjects (major changes since last revision)
Trademarks of Infineon Technologies AG
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HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™
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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 AN323, Rev.1.0
3 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
List of Content, Figures and Tables
Table of Content
®
1
About Wireless Fidelity (Wi-Fi ) / Wireless LAN (WLAN) ............................................................... 5
2
2.1
2.2
2.3
BFP760 Overview ............................................................................................................................... 7
Features ............................................................................................................................................... 7
Key Applications of BFP760 ................................................................................................................. 7
Description ........................................................................................................................................... 8
3
Application Circuit and Performance Overview .............................................................................. 9
3.1
Summary of Measurement Results ...................................................................................................... 9
3.2
BFP760 as Low Noise Amplifier for 5-6 GHz WLAN ......................................................................... 11
3.3
Schematics and Bill-of-Materials ........................................................................................................ 12
Measurement Graphs ............................................................................................................................................ 13
4
Evaluation Board and Layout Information .................................................................................... 22
5
Authors .............................................................................................................................................. 24
6
Remark .............................................................................................................................................. 24
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
®
5-6 GHz Wi-Fi Wireless LAN (WLAN, IEEE802.11b/g/n/a/c/ac) Front-End ....................................... 5
BFP760 in SOT343 .............................................................................................................................. 7
Package and pin definations of BFP760 .............................................................................................. 8
Schematics of the BFP760 Application Circuit ................................................................................... 12
Insertion Power Gain of the 5-6 GHz WLAN LNA with BFP760 ........................................................ 13
Wideband Insertion Power Gain of the 5-6 GHz WLAN LNA with BFP760 ....................................... 13
Noise Figure of BFP760 LNA for 5-6 GHz ......................................................................................... 14
Reverse Isolation of the 5-6 GHz WLAN LNA with BFP760 .............................................................. 14
Input Matching of the 5-6 GHz WLAN LNA with BFP760 .................................................................. 15
Input Matching of 5-6 GHz WLAN LNA with BFP760 (Smith Chart) .................................................. 15
Output Matching of the 5-6 GHz WLAN LNA with BFP760 ............................................................... 16
Output Matching of the 5-6 GHz WLAN LNA with BFP760 (Smith Chart) ......................................... 16
Wideband Stability k Factor of the 5-6 GHz WLAN LNA with BFP760 .............................................. 17
Wideband Stability Mu Factor of the 5-6 GHz WLAN LNA with BFP760 ........................................... 17
Input 1dB Compression Point of the BFP760 Circuit ......................................................................... 18
rd
Output 3 Order Intercept Point of BFP760 at 5500 MHz ................................................................. 18
Off mode Insertion Power Gain of the 5-6 GHz WLAN LNA with BFP760 ........................................ 19
Off mode Input Matching of the 5-6 GHz WLAN LNA with BFP760 .................................................. 19
Off mode input matching of 5-6 GHz WLAN LNA with BFP760 (Smith Chart) .................................. 20
Off mode Output Matching of the 5-6 GHz WLAN LNA with BFP760 ............................................... 20
Off mode output Matching of 5-6 GHz WLAN LNA with BFP760 (Smith Chart) ................................ 21
Off mode input 1dB compression point of the 5-6 GHz WLAN LNA with BFP760 ............................ 21
Photo Picture of Evaluation Board (overview) <PCB Marking Myymmdd Rev. x.x> ......................... 22
Photo Picture of Evaluation Board (detailed view) ............................................................................. 22
Layout Proposal for RF Grounding of the 5-6 GHz WLAN LNA with BFP760 ................................... 23
PCB Layer Information ....................................................................................................................... 23
List of Tables
Table 1
Table 2
Table 3
Table 4
Pin Assignment of BFP760 .................................................................................................................. 8
On-Mode Electrical Characteristics (at room temperature).................................................................. 9
Off-Mode Electrical Characteristics (at room temperature)................................................................ 10
Bill-of-Materials................................................................................................................................... 12
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
About Wireless Fidelity (Wi-Fi®) / Wireless LAN (WLAN)
1
About Wireless Fidelity (Wi-Fi®) / Wireless LAN (WLAN)
Wireless Fidelity (Wi-Fi®) or well-known as wireless LAN (WLAN) plays a major role in
today’s communications by enabling constant connection in the 5-6 GHzand 5 GHz bands
and broadband Internet access for users with laptops or devices equipped with wireless
network interface while roaming within the range of fixed access points (AP) or a public
hotspot. Different applications like home entertainment with wireless high-quality multimedia
signal transmission, home networking notebooks, mass data storages and printers implement
5 – 6 GHz Wi-Fi® into their system to offer high-speed wireless connectivity.
When wider coverage areas are needed and especially when a higher order modulation
scheme is used such as in emerging very high throughput wireless specifications like 256
Quadrature Amplitude Modulation (256QAM) in IEEE 802.11ac, the signal-to-noise-ratio
(SNR) requirements for both the AP and the client are more stringent. For this kind of highspeed high data rate wireless communication standards it is essential to ensure the quality of
the link path. Major performance criteria of these equipments have to be fulfilled: sensitivity,
strong signal capability and interference immunity. Below a general application diagram of a
WLAN system is shown.
Figure 1
®
5-6 GHz Wi-Fi Wireless LAN (WLAN, IEEE802.11b/g/n/a/c/ac) Front-End
In order to increase the system sensitivity, an excellent low noise amplifier (LNA) in front of
the receiver is mandatory, especially in an environment with very weak signal strength and
because of the insertion loss of the single-pole-double-throw (SPDT) switch and the
Application Note AN323, Rev.1.0
5 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
About Wireless Fidelity (Wi-Fi®) / Wireless LAN (WLAN)
Bandpass Filter (BPF) or diplexer. The typical allowed receiver chain Noise Figure (NF) of
approx. 2 dB can only be achieved by using a high-gain low noise amplifier (LNA).
In addition, strong signal environment can exist when the equipment is next to a transmitter.
In that case, the LNA must be linear enough, i.e. have high 1dB compression point. 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.
-
Application Note AN323, Rev.1.0
6 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
BFP760 Overview
2
BFP760 Overview
2.1
Features

Very low noise amplifier based on Infineon´s reliable, high
volume SiGe:C technology.

High linearity OIP3 = 27 dBm @ 5.5 GHz, 3 V, 30 mA.

High transition frequency fT = 45 GHz @ 1 GHz, 3 V, 35mA.

NFmin = 0.95 dB @ 5.5 GHz, 3 V, 10 mA,

Transducer gain |S21|2 = 16 dB @ 3.5 GHz, 3 V, 10 mA.

Low power consumption, ideal for mobile applications.

Easy to use Pb-free (RoHS compliant) and halogen-free
standard package with visible leads

Qualification report according to AEC-Q101 available.
2.2
Figure 2
BFP760 in SOT343
Key Applications of BFP760
 As Low Noise Amplifier (LNA) in
 Mobile and fixed connectivity applications: WLAN 802.11a/b/c/g/n, WiMAX 2.5/3.5 GHz,
Bluetooth
 Satellite communication systems: Navigation systems (GPS, Glonass), satellite radio
(SDARs, DAB) and C-band LNB
 Multimedia applications such as mobile/portable TV, CATV, FM Radio
 UMTS/LTE mobile phone applications
 ISM applications like RKE, AMR and Zigbee, as well as for emerging wireless
applications
 As discrete active mixer, buffer amplifier in VCOs
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
BFP760 Overview
2.3
Description
The BFP760 is a linear low noise wideband NPN bipolar RF transistor. The device is based
on Infineon’s reliable high volume silicon germanium carbon (SiGe:C) heterojunction bipolar
technology. The collector design supports voltages up to VCEO = 4.0 V and currents up to IC =
70 mA. With its high linearity at currents as low as 10 mA the device supports energy efficient
designs. The typical transit frequency is approximately 45 GHz. The device is housed in an
easy to use plastic SOT-343 package with visible leads.
B 1
4 E
XYs
E
2
3 C
BFP760
Figure 3
Table 1
Package and pin definations of BFP760
Pin Assignment of BFP760
Pin No.
Symbol
Function
1
B
Transitor base
2
E
Transitor emitter
3
C
Transitor collector
4
E
Transitor emitter
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
3
Application Circuit and Performance Overview
Device:
BFP760
Application: Low Noise Amplifier for 5-6 GHz WLAN with bypass
PCB Marking: M130225
3.1
Summary of Measurement Results
Table 2
On-Mode Electrical Characteristics (at room temperature)
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
3
V
DC Current
Icc
11.8
mA
Frequency Range
Freq
5.1
5.5
5.9
GHz
Gain (on mode)
Gon
13
12.6
11.8
dB
Noise Figure
NF
0.91
1.07
1.11
dB
RLin
13
14
9.6
dB
RLout
13.8
14.7
13.9
dB
IRev
19.7
19
18.8
dB
Input P1dB (On mode)
IP1dBon
-3.8
-3.9
-1.6
dBm
Output P1dB(On mode)
OP1dBon
8.2
7.7
9.2
dBm
Input Return Loss
Output Return Loss
Reverse Isolation
Comment/Test Condition
SMA and PCB losses (~0.15
dB) are subtracted
Input IP3
IIP3
7.4
dBm
Power @ Input: -30 dBm
f1= 5500 MHz, f2= 5501 MHz
Output IP3
OIP3
20
dBm
Power @ Input: -30 dBm
f1= 5500 MHz, f2= 5501 MHz
k
>1
--
Application Note AN323, Rev.1.0
9 / 25
Stability
Stability measured from
10MHz to 15GHz
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Table 3
Off-Mode Electrical Characteristics (at room temperature)
Parameter
Symbol
Value
Unit
DC Voltage
Vcc
3
V
DC Current
Icc
60
uA
Frequency Range
Freq
5.1
5.5
5.9
GHz
Gain (off mode)
Goff
-9.7
-9.9
-10.7
dB
Noise Figure
NF
9.7
9.9
10.7
dB
RLin
8.7
11.7
10
dB
RLout
9.9
8.8
7.6
dB
IRev
9.7
9.9
10.7
dB
IP1dBon
>10
>10
>10
dBm
Input Return Loss
Output Return Loss
Reverse Isolation
Input P1dB (On mode)
Stability
k
Application Note AN323, Rev.1.0
>1
10 / 25
--
Comment/Test Condition
SMA and PCB losses (~0.15
dB) are subtracted
Stability measured from
10MHz to 15GHz
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
3.2
BFP760 as Low Noise Amplifier for 5-6 GHz WLAN
This application note presents the high gain low noise amplifier with novel bypass solution,
using BFP760 for 5-6 GHz WLAN applications.
The circuit requires only ten 0402 passive components. It has in band gain of 13 dB. The
circuit achieves an input return loss better than 9.6 dB and output return loss better than 13.8
dB. The noise figure is about 0.91 dB (SMA and PCB losses are subtracted) for 5.1 GHz and
1.11 dB for 5.9 GHz. Furthermore, the circuit is unconditionally stable till 15 GHz. At 5500
MHz, using two tones spacing of 1 MHz, the output third order intercept point OIP3 reaches
20 dBm. And Input 1dB compression point IP1dB reaches -3.9 dBm for the same frequency.
In Off-mode, this circuit shows good performance with On-Off mode delta gain 22.5 dB. This
circuit has an input matching of -11.7 dB and output matching of -8.8 dB in off mode
condition. The input P1dB compression in the off-mode for the whole frequency range is
more than 10 dBm.
Application Note AN323, Rev.1.0
11 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
3.3
Schematics and Bill-of-Materials
Vbypass= 0 V (on mode)
Vbypass = 1.8 V (off mode)
Vcc = 3.0 V (on mode)
Vcc = 0 V (off mode)
J3
DC Connector
All passives are “0402“ case size
L1 & L2: LQG Series
C1 & C2: GJM Series
Other Capacitors: various
I = 11.8 mA
Rbyp
18 kΩ
R3
75 Ω
R1
15 kΩ
L1
3.6 nH
J1
RF Port1
INPUT
Q1
BFP760
C1
C4
33 pF
R2
27 Ω
L2
2.0 nH
C3
1.5 pF
C2
J2
RF Port2
OUTPUT
1.5 pF
0.7 pF
Q1: Vce = 1.85 V
A proper RF grounding is required to ensure
the LNA performance. Please refer to Chapter
4 for the layout proposal.
Total Component Count = 11
Including BFP760 transistor
PCB = M130225 0.4 mmx2
PCB Board Material = SOT343
Layer spacing (top RF to internal ground plane): 0.2 mm
Inductors = 2 (LQG series)
Resistors = 4
Capacitors = 4
Figure 4
Table 4
Symbol
Schematics of the BFP760 Application Circuit
Bill-of-Materials
Value
Unit
Size
Manufacturer
Comment
C1
0.7
pF
0402
Various
Input DC block & input matching
C2
1.5
pF
0402
Various
Output DC block & output matching
C3
1.5
pF
0402
Various
C4
33
pF
0402
Various
Output matching
RF decoupling / blocking cap
L1
3.6
nH
0402
Murata LQG series
Input matching
L2
2
nH
0402
Murata LQG series
Output matching & Collector biasing
R1
15
kΩ
0402
Various
DC biasing
R2
27
Ω
0402
Various
Stability improvement
R3
75
Ω
0402
Various
Rbyp
18
kΩ
0402
Various
DC biasing (provides DC negative
feedback to stabilize DC operating point
over temperature variation, transistor
hFE variation, etc.)
Bypass mode DC biasing
Q1
Application Note AN323, Rev.1.0
SOT343
Infineon Technologies BFP760 SiGe: C Heterojunction Bipolar
RF Transistor
12 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Measurement Graphs
Insertion Power Gain In Band
20
5.10 GHz
13.06 dB
15
5.50 GHz
12.62 dB
5.90 GHz
11.78 dB
10
5
5
Figure 5
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Insertion Power Gain of the 5-6 GHz WLAN LNA with BFP760
Insertion Power Gain WideBand
20
5.10 GHz
13.06 dB
15
10
5.90 GHz
11.78 dB
5.50 GHz
12.62 dB
5
0
0.1
Figure 6
2.1
4.1
6.1
Frequency (GHz)
8.1
10
Wideband Insertion Power Gain of the 5-6 GHz WLAN LNA with BFP760
Application Note AN323, Rev.1.0
13 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Noise Figure
1.2
1.1
5.9 GHz
1.11 dB
5.5 GHz
1.07 dB
5.1 GHz
0.91 dB
1
0.9
0.8
5
Figure 7
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Noise Figure of BFP760 LNA for 5-6 GHz
Reverse Isolation
-10
-15
5.50 GHz
-19.02 dB
-20
5.10 GHz
-19.70 dB
5.90 GHz
-18.81 dB
-25
-30
5
Figure 8
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Reverse Isolation of the 5-6 GHz WLAN LNA with BFP760
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Input Matching
0
-5
5.90 GHz
-9.58 dB
5.10 GHz
-13.52 dB
-10
5.50 GHz
-14.17 dB
-15
-20
5
Figure 9
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Input Matching of the 5-6 GHz WLAN LNA with BFP760
Swp Max
6GHz
2.
0
6
0.
0.8
1.0
Input Matching Smith Chart
0.
4
5.50 GHz
r 0.87
x 0.35
0
3.
0
4.
5.0
0.2
10.0
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 10
5.0
4.0
2.0
1.0
0.8
0.6
0.4
5.10 GHz
r 0.65
x 0.03
2
-0.
-4
.0
-5.
0
0
3.0
-10.0
0.2
10.0
5.90 GHz
r 1.26
x 0.75
Swp Min
5GHz
Input Matching of 5-6 GHz WLAN LNA with BFP760 (Smith Chart)
Application Note AN323, Rev.1.0
15 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Output Matching
-5
-10
5.9 GHz
-13.87 dB
5.1 GHz
-13.77 dB
-15
5.5 GHz
-14.71 dB
-20
5
Figure 11
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Output Matching of the 5-6 GHz WLAN LNA with BFP760
Swp Max
6GHz
2.
0
6
0.
0.8
1.0
Output Matching Smith Chart
0.
4
0
3.
5.10 GHz
r 0.68
x -0.13
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 12
10.0
4
.0
-5.
0
2
-0.
10.0
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0.2
5.0
5.90 GHz
r 0.83
x 0.33
-10.0
0.2
0
0
4.
5.50 GHz
r 0.70
x 0.08
Swp Min
5GHz
Output Matching of the 5-6 GHz WLAN LNA with BFP760 (Smith Chart)
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Stability k factor
3
2.5
3.199 GHz
1.034
2
1.5
1
0.5
0
0
Figure 13
2
4
6
8
Frequency (GHz)
10
12
14
Wideband Stability k Factor of the 5-6 GHz WLAN LNA with BFP760
Stability Mu factor
3
2.5
2
0.01 GHz
1.00
1.5
1
Mu1 factor
3.23 GHz
1.01
0.5
Mu2 factor
0
0
Figure 14
2
4
6
8
Frequency (GHz)
10
12
14
Wideband Stability Mu Factor of the 5-6 GHz WLAN LNA with BFP760
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Input P1dB Compression Point
18
P1dB at 5.1 GHz
P1dB at 5.5 GHz
Gain [dB]
16
-30 dBm
13.08 dB
P1dB at 5.9 GHz
-30 dBm
12.63
14
-3.758 dBm
12.08 dB
12
-30 dBm
11.79
-3.857 dBm
11.63
10
-1.606 dBm
10.79
8
-30
Figure 15
-25
-20
-15
-10
Input Power [dBm]
-5
0
Input 1dB Compression Point of the BFP760 Circuit
Output 3rd Order Intercept Point
0
5.5 GHz
-17
5.501 GHz
-17
-50
5.502 GHz
-92.16
5.499 GHz
-91.88
-100
-150
5.498
Figure 16
5.499
5.5
5.501
Frequency (GHz)
5.502
5.503
rd
Output 3 Order Intercept Point of BFP760 at 5500 MHz
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Off Mode Insertion Power Gain
-5
-7
5.1 GHz
-9.717 dB
-9
5.5 GHz
-9.888 dB
5.9 GHz
-10.66 dB
-11
-13
-15
5
Figure 17
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Off mode Insertion Power Gain of the 5-6 GHz WLAN LNA with BFP760
Off Mode Input Matching
0
5.10 GHz
-8.71 dB
-5
5.90 GHz
-9.97 dB
5.50 GHz
-11.70 dB
-10
-15
-20
5
Figure 18
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Off mode Input Matching of the 5-6 GHz WLAN LNA with BFP760
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Swp Max
6GHz
2.
0
6
0.
0.8
1.0
Off Mode Input Matching Smith Chart
0.
4
0
4.
5.10 GHz
r 0.47
x -0.12
-3
.0
.0
-2
-1.0
-0.8
-0
.6
.4
-0
Figure 19
10.0
-4
.0
-5.
0
2
-0.
10.0
5.0
4.0
3.0
5.90 GHz
r 0.91
x 0.63
2.0
1.0
0.8
0.6
0.2
5.0
-10.0
0.4
5.50 GHz
r 0.63
x 0.21
0.2
0
0
3.
Swp Min
5GHz
Off mode input matching of 5-6 GHz WLAN LNA with BFP760 (Smith Chart)
Off Mode Output Matching
0
-5
5.10 GHz
-9.86 dB
5.45 GHz
-8.81 dB
5.90 GHz
-7.58 dB
-10
-15
5
Figure 20
5.2
5.4
5.6
Frequency (GHz)
5.8
6
Off mode Output Matching of the 5-6 GHz WLAN LNA with BFP760
Application Note AN323, Rev.1.0
20 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Application Circuit and Performance Overview
Swp Max
6GHz
2.
0
6
0.
0.8
1.0
Off Mode Output Matching Smith Chart
0.
4
0
3.
0
4.
5.50 GHz
r 1.43
x 0.85
-3
.0
.0
-2
Swp Min
5GHz
-1.0
-0.8
-0
.6
.4
-0
Figure 21
10.0
5.0
4.0
5.90 GHz
r 2.01
x 0.82
-4
.0
-5.
0
2
-0.
3.0
2.0
1.0
10.0
0.8
0.4
0.2
0.2
0
5.0
-10.0
0.6
5.10 GHz
r 0.99
x 0.67
Off mode output Matching of 5-6 GHz WLAN LNA with BFP760 (Smith Chart)
Off mode input P1dB compression Point
-7
5.1 GHz
-8
Gain [dB]
5.5 GHz
-25 dBm
-9.718
5.9 GHz
-25 dBm
-9.9037
-9
9.751 dBm
-10.392
-10
-11
9.889 dBm
-10.429
-25 dBm
-10.672
9.848 dBm
-10.688
-12
-25
Figure 22
-20
-15
-10
-5
Input Power [dBm]
0
5
10
Off mode input 1dB compression point of the 5-6 GHz WLAN LNA with BFP760
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Evaluation Board and Layout Information
4
Evaluation Board and Layout Information
In this application note, the following PCB is used:
PCB Marking: M130225
PCB material: FR4
r of PCB material:4.3 (FR4)
Figure 23
Photo Picture of Evaluation Board (overview) <PCB Marking Myymmdd Rev. x.x>
Figure 24
Photo Picture of Evaluation Board (detailed view)
Application Note AN323, Rev.1.0
22 / 25
2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Evaluation Board and Layout Information
Figure 25
Layout Proposal for RF Grounding of the 5-6 GHz WLAN LNA with BFP760
Vias
FR4 Core, 0.2mm
Copper
35µm
Figure 26
FR4 Prepreg,
0.8mm
PCB Layer Information
Application Note AN323, Rev.1.0
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2013-07-12
BFP760
Low Noise Amplifier for 5-6 GHz WLAN with bypass
Authors
5
Authors
Moakhkhrul Islam, Application Engineer, Technical Marketing RF of Business Unit “RF and
Protection Devices”
Shamsuddin Ahmed, Application Engineer, Technical Marketing RF of Business Unit “RF and
Protection Devices”
Dr. Chih-I Lin, Senior Staff Engineer, Technical Marketing RF of Business Unit “RF and
Protection Devices”
6
Remark
The graphs are generated with the simulation program AWR Microwave Office®.
Application Note AN323, Rev.1.0
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2013-07-12
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Published by Infineon Technologies AG
AN323