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A pp li c at i on N ot e , R ev . 1 . 2 , J an ua ry 2 00 8
A p p li c a t i o n N o t e N o . 1 3 6
L o w C o s t , 3 V ol t , + 1 4 d B m 2 .3 3 G H z S D A R S
A c t i v e A nt e n n a 2n d S t a g e L ow N oi s e A m p l i f i e r
u s i n g th e I n f i ne o n B F P 6 4 0 S i G e T r a n s i s to r
R F & P r o t e c ti o n D e v i c e s
Edition 2008-01-07
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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Application Note No. 136
Application Note No. 136
Revision History: 2008-01-07, Rev. 1.2
Previous Version: 2004-11-12, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Small changes in figure descriptions
Application Note
3
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
1
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd
Stage Low Noise Amplifier using the Infineon BFP640 SiGe
Transistor
Overview
The Silicon-Germanium BFP640 SiGe Low Noise Transistor is shown in an SDARS active antenna LNA
application. The BFP640 is targeted for the 2nd stage in a 3 stage SIRIUS LNA chain. The demo board is standard
FR4 material and "0402" case sizes components are used throughout. A total of approximately 41 mm² of PCB
area is required, and the total component count, including the BFP640 and all passives, is 12.
SDARS Active Antenna LNA
2320 - 2332.5 MHz (SIRIUS, 3 Stages)
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Figure 1
Overview of SDARS Active Antenna LNA
Summary
Achieved 16.8 dB gain, 1.3 dB Noise Figure over the 2320 - 2345 MHz band, drawing 23.6 mA @ 3.0 V. Noise
figure result does NOT "back out" FR4 PCB losses - if PCB loss at LNA input were extracted, Noise Figure result
would be approximately 0.1 - 0.2 dB lower. Amplifier is unconditionally stable from 5 MHz to 6 GHz.
Output P1dB = +13.7 dBm @ 3 V. Input 3rd Order Intercept = +13.01 dBm @ 2332 MHz, Output IP3 = +29.8 dBm.
Application Note
4
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
PCB Cross - Section Diagram
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Schematic Diagram
Application Note
5
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Summary of Data
T = 25 °C, Network analyzer source power = -25 dBm
Table 1
Summary of Data
Parameter
Result
Comments
Frequency Range
Under 2320 - over 2345 MHz
Covers both XM Radio and SIRIUS
frequency bands.
DC Current
23.6 mA @ 3.0 V
Note power supply voltage is
measured directly across PCB
supply line and ground, to eliminate
voltage drop across wire harness.
Gain
16.9 dB @ 2320 MHz
16.8 dB @ 2332.5 MHz
16.8 dB @ 2345 MHz
Negligible change in gain or
matching at 3.3 or 3.0 volts.
Noise Figure
1.3 dB @ 2320 MHz
1.3 dB @ 2332.5 MHz
1.4 dB @ 2345 MHz
These values do not extract PCB
losses, etc. resulting from FR4
board an passives used on PCB these results are at input SMA
connector.
Input P1dB
-2.1 dBm @ 3.0 V
Measured @ 2332.5 MHz. See
Figure 8
Output P1dB
+13.7 dBm @ 3.0 V
See Figure 8
Power Added Efficiency (PAE) at
1 dB Compression Point
32.2% @ 3.0 V
PAE = (POUT - PIN) / (VCC x IC)
Decent results for a “Class A”
amplifier.
Input 3rd Order Intercept
+13.0 dBm @ 2332 MHz
Measured at 3.3 V, see Figure 15
and Figure 16
Output 3rd Order Intercept
+29.8 dBm @ 2332 MHz
Measured at 3.3 V, see Figure 15
and Figure 16
Input Return Loss
17.8 dB @ 2320 MHz
18.1 dB @ 2332.5 MHz
15.5 dB @ 2345 MHz
Output Return Loss
14.6 dB @ 2320 MHz
14.2 dB @ 2332.5 MHz
13.9 dB @ 2345 MHz
Reverse Isolation
21.7 dB @ 2320 MHz
21.6 dB @ 2332.5 MHz
21.6 dB @ 2345 MHz
Application Note
6
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Noise Figure, Plot, 2232.5 MHz to 2432.5 MHz, Center of Plot (x-axis) is 2332.5 MHz.
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Figure 4
Noise Figure
Application Note
7
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Noise Figure, Tabular Data
From Rohde & Schwarz FSEK3 + FSEB30
System Preamplifier = MITEQ SMC-02
Table 2
Noise Figure
Frequency
Noise Figure
2232.5 MHz
1.34 dB
2245 MHz
1.34 dB
2257.5 MHz
1.38 dB
2270 MHz
1.34 dB
2282.5 MHz
1.34 dB
2295 MHz
1.33 dB
2307.5 MHz
1.33 dB
2320 MHz
1.34 dB
2332.5 MHz
1.29 dB
2345 MHz
1.36 dB
2357.5 MHz
1.34 dB
2370 MHz
1.31 dB
2382.5 MHz
1.31 dB
2395 MHz
1.32 dB
2407.5 MHz
1.32 dB
2420 MHz
1.35 dB
2432.5 MHz
1.31 dB
2442.5 MHz
1.31 dB
Application Note
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Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Scanned Image of PC Board
Figure 5
Image of PC Board
Application Note
9
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Scanned Image of PC Board, Close-In Shot.
Total PCB area used ≅ 41 mm²
Figure 6
Image of PC Board, Close-In Shot
Application Note
10
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Stability Factor “K” and Stability Measure “B1” (5 MHz - 6 GHz)
Plots are generated from real, measured S parameters taken from the demo PC board, NOT a simulation.
S parameters are exported from Network Analyzer, then imported into Eagleware GENESYS software, which
calculates and plots K and B1. Note K > 1 and B1 > 0, showing unconditional stability.
K is trace in red color (bottom trace) and is assigned to left vertical axis at bottom of page. Note K > 1.
“Glitch" at low frequencies e.g. < 200 MHz is due to lack of dynamic range in network analyzer - S parameter S12
becomes vanishingly small as one moves lower in frequency, which causes expression for calculating "K" to "blow
up”.
B1 is trace is blue in color (top trace) and is assigned to right vertical.
Figure 7
Plot of K(f) and B1(f)
Application Note
11
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Gain Compression Test
VCC = 3.0 V
Network Analyzer is set to "CW" mode - e.g. set to a single frequency, with power sweep. Input power is swept
from -25 dBm to +3 dBm at 2332.5 MHz.Amplifier hits Input 1 dB compression point (IP1dB) at - 2.1 dBm input
power. Output P1dB = - 2.1 dBm + 15.8 dB gain at P1dB point => +13.7 dBm, or 23.4 mW.
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Figure 8
Plot of Gain Compression Test
Application Note
12
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Input Return Loss, Log Mag
5 MHz - 6 GHz
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Figure 9
Plot of Input Return Loss
Application Note
13
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Input Return Loss, Smith Chart
Reference Plane = Input SMA Connector on PC Board
5 MHz - 6 GHz
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Figure 10
Smith Chart of Input Return Loss
Application Note
14
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Forward Gain, Wide Sweep
5 MHz - 6 GHz
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Figure 11
Plot of Forward Gain
Application Note
15
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Reverse Isolation
5 MHz - 6 GHz
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Figure 12
Plot of Reverse Isolation
Application Note
16
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Output Return Loss, Log Mag
5 MHz - 6 GHz
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Figure 13
Plot of Output Return Loss
Application Note
17
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Output Return Loss, Smith Chart
Reference Plane = Output SMA Connector on PC Board
5 MHz - 6 GHz
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Figure 14
Smith Chart of Output Return Loss
Application Note
18
Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Two-Tone Test, 2332 MHz
Input Stimulus for Amplifier Two-Tone Test.
f1 = 2332 MHz, f2 = 2333 MHz, -19 dBm each tone.
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Figure 15
Tow-Tone Test, Input Stimulus @ 2332 MHz
Application Note
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Rev. 1.2, 2008-01-07
Application Note No. 136
Low Cost, 3 Volt, +14 dBm 2.33 GHz SDARS Active Antenna 2nd Stage Low
Two-Tone Test, 2332 MHz
LNA Response to Two-Tone Test.
Input IP3 = -19 + (64.0 / 2) = +13.0 dBm
Output IP3 = +13.0 dBm + 16.8 dB gain = +29.8 dBm
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Figure 16
Tow-Tone Test, LNA Response @ 2332 MHz
Application Note
20
Rev. 1.2, 2008-01-07
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