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Technical Report
Technical Report, 2009-Aug-14
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
Technical Report TR102
BDTIC
Device:
BGB741L7ESD
Application: WiMAX LNA from 2.3GHz to
3.7GHz
Revision:
Rev. 1.2
Date:
2009-Aug-14
RF and Protection Devices
1
www.BDTIC.com/infineon
2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
BDTIC
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 12/18/09.
All Rights Reserved.
Legal Disclaimer
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics (“Beschaffenheitsgarantie”). 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 your
nearest Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements components may contain dangerous substances. For information on the
types in question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems 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.
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
1. Overview
Infineon Device:
BGB741L7ESD
Application:
WiMax LNA for 2.3GHz … 3.7GHz
2. Description:
BGB741L7ESD is a broadband featured RF transistor with integrated active biasing
circuit, feedback circuit and ESD protection. Due to Infineon’s excellent RF transistor
BDTIC
technologies, BGB741L7ESD still owns quite low noise figure of about 1.1 dB at 2.3
GHz and 1.25 dB at 3.7 GHz although a feedback circuit. Therefore BGB741L7ESD
is very suitable for WiMAX applications which require well-defined broadband
characteristics.
Figure 2-1: Overview of BGB741L7ESD
The Input and output matching are also integrated into the circuit. Therefore no
critical matching elements are required in the applications. Through the external
resistor RExt, it is easy to tune the current consumption of BGB741L7ESD in the
range of 6 mA to 12 mA. In this application example, 3.3 kΩ is used to achieve 11 mA.
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
3. Schematics:
BDTIC
Figure 3-1: Schematics of the application circuit
Table 3-1: Bill of Materials:
Symbol
Value
Unit
Size
Supplier
Cin
47
pF
0402
Various
Cout
47
pF
0402
Various
Cstab1
100
nF
0402
Various
Cstab2
100
nF
0402
Various
LB
40
nH
0402
Murata
LQW15 series
LC
40
nH
0402
Murata
LQW15 series
Rext
3.3
kΩ
0402
Various
J1
0
Ohm
0402
Various
4
Comment
not necessary for final PCB
design
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
4. Summary of Data
Table 4-1: Measurement data at room temperature
Parameter
Symbol
Value
Unit
Note/Test Condition
Frequency Range
Freq
2.3 – 2.7
GHz
DC Voltage
Vcc
3.0
V
DC Current
Icc
10.8
mA
Gain
G
18.7
dB
Off-Mode Gain
Goff
-18
dB
Noise Figure
NF
1.1
dB
Input Return Loss
S11
12
dB
@2.5GHz
Output Return Loss
S22
12
dB
@2.5GHz
Input P1dB
IP1dB
-6.7
dBm
@2.5GHz
Output P1dB
OP1dB
+11
dBm
@2.5GHz
Input IP3
IIP3
+2
dBm
@2.5GHz
Output IP3
OIP3
+20.7
dBm
@2.5GHz
Stability
k
>1
--
Vctrl=0V
BDTIC
Unconditionally stable
Note: board losses is removed for gain and noise figure.
Table 4-2: Measurement data at room temperature
Parameter
Symbol
Value
Unit
Note/Test Condition
Frequency Range
Freq
3.4 – 3.7
GHz
DC Voltage
Vcc
3.0
V
DC Current
Icc
10.8
mA
Gain
G
17
dB
Off-Mode Gain
Goff
-18.5
dB
Noise Figure
NF
1.25
dB
Input Return Loss
S11
12
dB
@3.5GHz
Output Return Loss
S22
12
dB
@3.5GHz
Input P1dB
IP1dB
-6.5
dBm
@3.5GHz
Output P1dB
OP1dB
+9.5
dBm
@3.5GHz
Input IP3
IIP3
+3.5
dBm
@3.5GHz
Output IP3
OIP3
+20.5
dBm
@3.5GHz
Stability
k
>1
--
Vctrl=0V
Unconditionally stable
Note: board losses is removed for gain and noise figure.
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
5. Measured Graphs
5.1 High-Gain Mode Characteristics:
Narrowband Gain
20
DB(|S(2,1)|)
B1_BGB741_1_4_GHz_PE
19
BDTIC
18
17
16
15
2.3
2.4
2.5
2.6
2.7
2.8
2.9 3 3.1 3.2
Frequency (GHz)
3.3
3.4
3.5
3.6
3.7
Figure 5-1: Gain curve of BGB741L7 for 2.3GHz to 3.7GHz (line losses not
deembeded)
Wideband Gain
30
DB(|S(2,1)|)
B1_BGB741_1_4_GHz_PE
25
20
15
10
5
0
0
1
2
3
4
5
6
Frequency (GHz)
7
8
9
10
Figure 5-2: Wideband gain curve of BGB741L7
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
Noise Figure
1.5
PlotCol(1,2)
Noise Figure
Noise Figure (dB)
1.4
1.3
1.2
BDTIC
1.1
1
2.3
2.5
2.7
2.9
3.1
Frequency (GHz)
3.3
3.5
3.7
Figure 5-3: Noise figure curve of BGB741L7 for 2.3GHz to 3.7GHz (line loss
deembeded)
Input and Output Matching
0
DB(|S(1,1)|)
B1_BGB741_1_4_GHz_PE
DB(|S(2,2)|)
B1_BGB741_1_4_GHz_PE
-5
-10
-15
-20
2
2.5
3
Frequency (GHz)
3.5
4
Figure 5-4: Input matching (blue line) and output matching (red line) of
BGB741L7 over frequencies.
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
5.2 Off-Mode Characteristics:
Wideband Off_Mode Gain
-10
DB(|S(2,1)|)
BGB741L7_Off
-15
-20
BDTIC
-25
-30
0
1
2
3
4
5
6
Frequency (GHz)
7
8
9
10
Figure 5-5: Wireband S21 curve of BGB741L7 in the off-mode
(Vcc=3V, Vctrl=0V)
Input and Output Matching in off mode
0
DB(|S(1,1)|)
BGB741L7_Off
DB(|S(2,2)|)
BGB741L7_Off
-2
-4
-6
-8
-10
2
2.5
3
Frequency (GHz)
3.5
4
Figure 5-6: Input matching (blue line) and output matching (red line) of
BGB741L7 over frequencies in the off mode (Vcc=3V, Vctrl=0V).
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2009-Aug-14
Technical Report
BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz
_______________________________________________________________
6. Evaluation Board and Layout Information
J1
BDTIC
Figure 6-1: PCB Overview (PCB ID-No: BGB7-Family, TSLP-7-1)
Figure 6-2: Layout Information
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Published by Infineon Technologies AG
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2009-Aug-14