AN197 - Infineon

BAR9 0-0 2 L
BAR9 0 Pi n Di ode Switch fo r 2.42.5 G Hz W LAN Appli c ation
Application Note AN197
Revision: Rev. 1.0
2010-03-17
RF and Protecti on Devi c es
Edition 2010-03-17
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2010 Infineon Technologies AG
All Rights Reserved.
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BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Application Note AN197
Revision History: 2010-03-17
Previous Revision: No previous revision
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Subjects (major changes since last revision)
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MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. Mifare™ of NXP. MIPI™ of MIPI Alliance, Inc.
MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO. OmniVision™ of
OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF
Micro Devices, Inc. SIRIUS™ of Sirius Sattelite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™
of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co.
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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 2009-10-19
Application Note AN197, Rev. 1.0
3 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
List of Content, Figures and Tables
Table of Content
1
Introduction ........................................................................................................................................5
2
Overview .............................................................................................................................................6
3
Description..........................................................................................................................................6
4
Application Information .....................................................................................................................7
5
Typical Measurement Results...........................................................................................................8
6
Measured Graphs ...............................................................................................................................9
7
Evaluation Board and layout Information......................................................................................12
Authors..............................................................................................................................................13
List of Figures
BAR90-02L in TSLP-2 Package ..............................................................................................................................5
Figure 1
Schematics of the application circuit ....................................................................................................7
Figure 2
Port return loss of the BAR90-02L PIN diode switch for ANT-RX mode .............................................9
Figure 3
Transmission/Isolation of the BAR90-02L PIN diode switch for ANT-RX mode..................................9
Figure 4
Port return loss the BAR90-02L PIN diode switch for ANT-TX mode................................................10
Figure 5
Transmission/Isolation of the BAR90-02L PIN diode switch for ANT-TX mode ................................10
Figure 6
ANT-RX to ANT-TX switching time of the BAR90-02L PIN diode switch ..........................................11
Figure 7
ANT-TX to ANT-RX switching time of the BAR90-02L PIN diode switch ..........................................11
Figure 8
Layout of the BAR90-02L PIN diode Switch ......................................................................................12
Figure 9
PCB Layer Information .......................................................................................................................12
List of Tables
Table 1
Table 2
Table 3
Bill-of-Materials.....................................................................................................................................7
Summary of Measurement Results for the BAR90 in TSLP2 ..............................................................8
Summary of Switching characteristics Results for the BAR90 in TSLP2.............................................8
Application Note AN197, Rev. 1.0
4 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Introduction
1
Introduction
1.1
BAR90-02L Features
•
•
•
•
•
•
Optimized for low bias antenna switches
in hand held applications
Very low capacitance at zero volt
reverse bias at frequencies above 1GHz
(typ 0.19pF)
Low forward resistance (typ 1.3 Ω @
if=3 mA)
Improved ON/OFF mode Harmonic
distortion balance
Pb-free (ROHS compliant) package
Qualified according AEC Q101
1.2
BAR90-02L in TSLP-2 Package
Applications
This PIN diode is suitable for all applications relative to circuits like mixers, switches,
attenuators, phase shifter and so on. Its low capacitance through the i-zone enhances the
Intermodulation characteristics.
Moreover, its relatively low Insertion Losses (IL=0.3dB @f=6GHz, If=0.5mA) make it an
interesting solution for RF applications.
The device is also available in different packages (TSLP-2-7(single diode), TSSLP-2-1
(single diode), TSLP-4-7 (anti-parallel pair of diodes) which fits to a large range of usage
conditions.
Application Note AN197, Rev. 1.0
5 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Overview
2
Overview
Device :
BAR90-02L
Application:
WLAN 2.4-2.5GHz Application
PCB Marking: BAR90 Pin diode switch 2.45GHz
3
Description
This Application Note presents the measurement results of the BAR90-02L PIN-diode switch
for 2.4 – 2.5 GHz WLAN and WiMAX applications.
This PIN-diode switch is realized with two BAR90-02L diodes. We obtain an insertion loss of
0.6dB/0.9dB (referred to Table 1) in either Tx mode and Rx mode. Furthermore, the isolation
provided by the switch with TSLP2 package is at least -24 dB.
The Input and output of the BAR90-02L PIN-diode switch are matched to 50Ω with a
minimum return loss of -14.9 dB in the Tx-ANT mode and -16.8 dB in the Rx-ANT mode.
The actual BAR90-02L PIN-diode switch presents a very good linearity. By inserting an input
power of 15 dBm, the output IP3 is better than 45 dBm. The input compression point with 0.1
dB insertion loss degradation is located at more than 30dBm.
With this optimised application circuit, the setting time of as low as 75ns is achieved. The
max. setting time from ANT-TX to ANT-RX is about 280ns.
Application Note AN197, Rev. 1.0
6 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Application Information
4
Application Information
4.1
Schematics
Figure 1
Schematics of the application circuit
Table 1
Bill-of-Materials
Symbol
Value
Unit
Size
Manufacturer
Comment
C1
2.7
pF
0402
Various
Input Matching for Tx port
C2
1
nF
0402
Various
HF ground
C3
1.7
pF
0402
Various
Output/Input Matching for Antenna
C4
1.9
pF
0402
Various
Resonance circuit @2.45GHz
C5
2.2
pF
0402
Various
Output Matching for Rx port
L1
56
nH
0402
Murata LQG15HS
DC Feed for Diodes
L2
24
nH
0402
Murata LQG15HS
Resonance [email protected]/ can be replaced
by a jumper for worse [email protected] mode
R1
180
Ω
0402
Various
DC Bias
R2
270
Ω
0402
Various
Diode Voltage settings
TX1
5
mm
0402
Mircrostrip Line
Rf track length improved for better Isolation
TX2
8
mm
0402
Mircrostrip Line
RF track length improved for ANT Matching
TX3
9
mm
0402
Mircrostrip Line
λ/4 track improved for better results
D1
0402
Infineon Technologies Silicon PIN diode BAR90-02L(TSLP2)
D2
0402
Infineon Technologies Silicon PIN diode BAR90-02L(TSLP2)
Application Note AN197, Rev. 1.0
7 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Typical Measurement Results
5
Typical Measurement Results
Table 2
Summary of Measurement Results for the BAR90 in TSLP2
Parameter
Symbol
Value
Unit
Frequency Range
Freq
2.4-2.5
GHz
DC Voltage
Vcc
0
3.3
V
DC Current
Icc
0
9
mA
ANT-RX
ANT-TX
Mode
Insertion Loss
IR
0.6
0.9
dB
Isolation Tx/Rx
ISTX
23.9
29.7
dB
Isolation Rx/ANT
ISRA
30.3
dB
Isolation Tx/ANT
ISTA
24.4
Return Loss Rx
RLRX
16.8
0.26
dB
Return Loss Tx
RLTX
0.12
14.9
dB
Return Loss ANT
RLA
17.3
17.2
dB
Output IP3
Oip3
Intermodulation
Distance IMD3
IMD3
Input 0.1dB
Compression
Ip0.1dB
Table 3
Note/Test Condition
Please refer to Table 3
dB
> 45
dBm
> 80
dBc
> 30
Measured @ Pin=15dBm
dBm
Summary of Switching characteristics Results for the BAR90 in TSLP2
(Measured @ Pin=15dBm)
Parameter
Symbol
Value
Unit
Note/Test Condition
Setting Time
Tson
75
ns
ANT-RX to ANT-TX
Setting Time
Tsoff
280
ns
ANT-TX to ANT-RX
Rise Time
Tron
165
ns
ANT-RX to ANT-TX
Fall Time
Tfoff
90
ns
ANT-TX to ANT-RX
Notes:
Setting Time: Response delay after DC power supply Vdd switches on/off.
Rise/Fall Time: Transition time of RF power change from 10% to 90% or vise versa.
Application Note AN197, Rev. 1.0
8 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Measured Graphs
6
Measured Graphs
6.1.1
Measurement for ANT-RX Mode
Port Return Loss
0
2450 MHz
-0.1227 dB
-10
2450 MHz
-16.76 dB
-20
RX
2450 MHz
-17.29 dB
-30
TX
-40
ANT
-50
2000
Figure 2
2200
2400
2600
Frequency (MHz)
2800
3000
Port return loss of the BAR90-02L PIN diode switch for ANT-RX mode
RX->ANT
Port Transmission and Isolation
0
TX->ANT
2450 MHz
-0.6007 dB
-10
TX->RX
2450 MHz
-23.91 dB
-20
-30
-40
2000
Figure 3
2450 MHz
-24.38 dB
2200
2400
2600
Frequency (MHz)
2800
3000
Transmission/Isolation of the BAR90-02L PIN diode switch for ANT-RX mode
Application Note AN197, Rev. 1.0
9 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Measured Graphs
6.1.2
Measurement for ANT-TX Mode :
Port Return Loss
0
-10
2450 MHz
-0.2633 dB
2450 MHz
-14.89 dB
-20
RX
2450 MHz
-17.21 dB
-30
TX
-40
ANT
-50
2000
Figure 4
2200
2400
2600
Frequency (MHz)
2800
3000
Port return loss the BAR90-02L PIN diode switch for ANT-TX mode
RX->ANT
Port Transmission and Isolation
0
TX->ANT
2450 MHz
-0.8945 dB
-10
TX->RX
2450 MHz
-29.65 dB
-20
-30
2450 MHz
-30.25 dB
-40
2000
Figure 5
2200
2400
2600
Frequency (MHz)
2800
3000
Transmission/Isolation of the BAR90-02L PIN diode switch for ANT-TX mode
Application Note AN197, Rev. 1.0
10 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Measured Graphs
6.1.3
Switching Time Measurement:
Figure 6
ANT-RX to ANT-TX switching time of the BAR90-02L PIN diode switch
Figure 7
ANT-TX to ANT-RX switching time of the BAR90-02L PIN diode switch
Application Note AN197, Rev. 1.0
11 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Evaluation Board and layout Information
7
Evaluation Board and layout Information
Figure 8
Layout of the BAR90-02L PIN diode Switch
Figure 9
PCB Layer Information
Application Note AN197, Rev. 1.0
12 / 14
2010-03-17
BAR90-02L
BAR90 Pin Diode Switch for 2.4-2.5GHz WLAN Application
Authors
Authors
Anthony Thomas, Application Engineer in Business Unit “RF and Protection Devices”.
Dr Chih-I Lin, Senior Staff Engineer in Business Unit “RF and Protection Devices”
Application Note AN197, Rev. 1.0
13 / 14
2010-03-17
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG
AN197