Ap pl ica t io n N o te, Re v. 1 . 2, F e br ua ry 2 00 8
A p p li c a t i o n N o t e N o . 1 4 7
Low Cost 3 - 4 GHz UWB Low Noise Amplifier
u s i n g th e B F P 4 0 5 F c o n s u m e s o n l y 2 m A fr o m a
1.5 V Power Supply
R F & P r o t e c ti o n D e v i c e s
Edition 2008-02-21
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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THIRD PARTY) WITH RESPECT TO ANY AND ALL INFORMATION GIVEN IN THIS APPLICATION NOTE.
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Application Note No. 147
Application Note No. 147
Revision History: 2008-02-21, Rev. 1.2
Previous Version: 2005-05-27, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Small changes in figure descriptions
Application Note
3
Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
1
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F
consumes only 2 mA from a 1.5 V Power Supply
Applications
•
Ultra Wideband (UWB) applications in the 3 to 4 GHz frequency range.
Overview
The Infineon BFP405F SIEGET RF Transistor in TSFP-4 package is shown in a low-cost LNA circuit suitable for
3 to 4 GHz applications demanding low power consumption. Effort has been made to reduce component count to
the minimum; however 2 chip coils are required for input and output impedance matching to 50 Ω.
Summary
(for more complete results, see Table 1)
•
•
•
•
Amplifier is unconditionally stable from 5 MHz - 8 GHz (K > 1)
10.2 dB Gain at 3500 MHz
2.0 dB NF at 3500 MHz *
2.0 mA current consumption at 1.5 V
* Note that PCB loss is not extracted. If PCB loss were extracted, NF would be 0.1 to 0.2 dB lower.
Cross Sectional Diagram of PC Board
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Figure 1
PCB - Cross Sectional Diagram
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Schematic Diagram, with Reduced Parts Count
Note “0402” case size passives are used.
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Figure 2
Schematic Diagram
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Summary of Data
T = 25 °C, network analyzer source power ≈ -30 dBm
Table 1
Summary of Data
Parameter
Result
Comments
Frequency Range
3.0 - 4.0 GHz
Various portions of this range are
usable on a worldwide basis
DC Current
(VCC = 1.5 V, VCE = 1.1 V)
2.0 mA
Gain
11.0 dB @ 3000 MHz
10.2 dB @ 3500 MHz
8.8 dB @ 4000 MHz
10.3 dB @ 2450 MHz
Noise Figure
2.2 dB @ 3000 MHz
2.0 dB @ 3500 MHz
2.0 dB @ 4000 MHz
Gain @ 4 GHz could be improved if
one more inductor was used, e.g.
use RF choke instead of resistor R3.
Gain at 2450 MHz was measured to
address concerns of 2.4 GHz
interfering signals.
PCB loss not extracted, these
results are at input SMA connector,
result would be 0.2 dB lower if PCB
loss were extracted.
> 3 dB @ 2450 MHz
Input P1dB
-19.0 dBm @ 3500 MHz
Output P1dB
-9.8 dBm @ 3500 MHz
rd
Input 3 Order Intercept
-11.5 dBm @ 3500 MHz
Output 3rd Order Intercept
-1.3 dBm @ 3500 MHz
Input Return Loss
10.2 dB @ 3000 MHz
12.2 dB @ 3500 MHz
9.3 dB @ 4000 MHz
IP3 could be improved 6 to 10 dB by
adding in LF Trap at Input, add in 1
inductor, 1 capacitor.
4.1 dB @ 2450 MHz
Output Return Loss
9.5 dB @ 3000 MHz
14.0 dB @ 3500 MHz
14.2 dB @ 4000 MHz
11.9 dB @ 2450 MHz
Reverse Isolation
22.1 dB @ 3000 MHz
21.2 dB @ 3500 MHz
21.0 dB @ 4000 MHz
24.7 dB @ 2450 MHz
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Details on TSFP-4 Package (Thin Small Flat Pack)
Dimensions in Millimeters (mm).
0.2 ±0.05
3
1
1.2 ±0.05
0.2 ±0.05
4
0.55 ±0.04
2
0.2 ±0.05
10˚ MAX.
0.8 ±0.05
1.4 ±0.05
0.15 ±0.05
0.5 ±0.05
0.5 ±0.05
Figure 3
GPX01010
Package Details of TSFP-4
Recommended Soldering Footprint for TSFP-4 (dimensions in millimeters).
Device package is to be oriented as shown in above drawing (e.g. orient long package dimension horizontally on
this footprint).
0.9
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0.35
0.5
0.5
HLGF1011
Figure 4
Package Footprint of TSFP-4
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Noise Figure, Plot, 2.5 to 4.5 GHz. Center of Plot (x-axis) is 3.5 GHz.
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Figure 5
Noise Figure
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Noise Figure, Tabular Data
From Rohde & Schwarz FSEK3 + FSEM30 + System Preamplifier
System Preamplifier = MITEQ SMC-02
Table 2
Noise Figure
Frequency
Noise Figure
2500 MHz
2.96 dB
2600 MHz
2.80 dB
2700 MHz
2.64 dB
2800 MHz
2.46 dB
2900 MHz
2.36 dB
3000 MHz
2.21 dB
3100 MHz
2.17 dB
3200 MHz
2.13 dB
3300 MHz
2.09 dB
3400 MHz
2.07 dB
3500 MHz
2.03 dB
3600 MHz
2.00 dB
3700 MHz
2.00 dB
3800 MHz
2.00 dB
3900 MHz
1.97 dB
4000 MHz
1.99 dB
4100 MHz
1.96 dB
4200 MHz
2.00 dB
4300 MHz
2.01 dB
4400 MHz
2.06 dB
4500 MHz
2.11 dB
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Scanned Image of PC Board
Figure 6
Image of PC Board
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Scanned Image of PC Board, Close-In Shot.
Total PCB area used ≅ 45 mm². PCB Area may be reduced.
Figure 7
Image of PC Board, Close-In Shot
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Stability
Rohde and Schwarz ZVC Network Analyzer calculates and plots Stabilty Factor "K" in real time, from 5 MHz to
8 GHz. Note K > 1 from 5 MHz to 8 GHz; minimum K value is approximately 1.4 at ≈ 1800 MHz. Amplifier is
Unconditionally Stable over 5 MHz - 8 GHz frequency range.
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Figure 8
Plot of K(f)
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Gain Compression at 3.5 GHz
Amplifier is checked for 1 dB compression point at VCC = 1.5 V, IC = 2.0 mA (with VCE = 1.1 V). An Agilent power
meter was used to ensure accurate power levels are measured (as opposed to using Vector Network Analyzer in
"Power Sweep" mode).
Output P1dB ≅ -9.8 dBm; Input P1dB ≅ -9.8 dBm - (Gain - 1 dB) = -9.8 dBm - 9.2 dB = -19 dBm
Table 3
Gain Compression at 3.5 GHz
PIN, dBm
POUT, dBm
Gain, dB
-30.2
-20.0
10.2
-29.2
-19.0
10.2
-28.2
-18.0
10.2
-27.2
-17.0
10.2
-26.2
-16.0
10.2
-25.1
-15.0
10.1
-24.1
-14.0
10.1
-23.0
-13.0
10.0
-21.9
-12.0
9.9
-20.6
-11.0
9.6
-19.3
-10.0
9.3
-17.8
-9.0
8.8
-15.9
-8.0
7.9
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Figure 9
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Plot of BFP405F Gain Compression, 1.5 V, 2 mA, T = 25 °C
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Please Note - all plots are taken from Rohde and Schwarz ZVC Network Analyzer
T = 25 °C, source power ≈ -30 dBm.
Input Return Loss, Log Mag
5 MHz - 8 GHz Sweep
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Figure 10
Plot of Input Return Loss
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Input Return Loss, Smith Chart
Reference Plane = Input SMA Connector on PC Board
5 MHz - 8 GHz Sweep
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Figure 11
Smith Chart of Input Return Loss
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Forward Gain
5 MHz - 8 GHz Sweep
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Figure 12
Plot of Forward Gain
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Reverse Isolation
5 MHz - 8 GHz
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Figure 13
Plot of Reverse Isolation
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Output Return Loss, Log Mag
5 MHz - 8 GHz
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Figure 14
Plot of Output Return Loss
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Output Return Loss, Smith Chart
Reference Plane = Output SMA Connector on PC Board
5 MHz - 8 GHz Sweep
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Figure 15
Smith Chart of Output Return Loss
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Two Tone Test, 3.5 GHz
Input Stimulus for Amplifier Two-Tone Test:
f1 = 3500 MHz, f2 = 3501 MHz, -30 dBm each tone.
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Figure 16
Tow-Tone Test, Input Stimulus
Application Note
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Rev. 1.2, 2008-02-21
Application Note No. 147
Low Cost 3 - 4 GHz UWB Low Noise Amplifier using the BFP405F consumes
Two Tone Test, 3.5 GHz
LNA response to Two-Tone Test.
Input IP3 = -30 + (37.0 / 2) = -11.5 dBm
Output IP3 = -11.5 dBm + 10.2 dB gain = -1.3 dBm
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Figure 17
Tow-Tone Test, LNA Response
Application Note
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Rev. 1.2, 2008-02-21