A pp li c at io n N o t e, R e v . 1. 2 , N ov e m be r 2 00 7
A p p li c a t i o n N o t e N o . 1 2 8
R e d u c e d P ar t s C o u n t L N A f o r 1 .4 - 2 .0 G H z u s i n g
t h e S i G e T r a n s i s to r B F P 6 4 0 F
R F & P r o t e c ti o n D e v i c e s
Edition 2007-11-28
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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Application Note No. 128
Application Note No. 128
Revision History: 2007-11-28, Rev. 1.2
Previous Version: 2005-06-06, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Small changes in figure descriptions
Application Note
3
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
1
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe
Transistor BFP640F
Applications
•
•
•
Digital Audio Broadcasting DAB-L (1452.960 to 1490.624 MHz)
GPS “L1” Frequency (1575.42 MHz)
1900 MHz PHS and PCS
Overview
Infineon Technologies' Low Noise Silicon-Germanium BFP640F RF Transistor in TSFP-4 package is shown in a
reduced component count, low-cost LNA circuit suitable for 1.4 to 2.0 GHz applications which require high gain
and noise figures in the 0.9 dB range. Note some performance e.g. IP3 and Input / Output matching - is sacrificed
in order to reduce external component count to the absolute minimum.
Summary of Data
T = 25 °C, network analyzer source power ≅ -30 dBm
• VCC = 3.0 V, I = 9.1 mA, VCE = 1.5 V, amplifier takes approx. 35 mm² PC Board area
•
•
No chip coils are used, only 3 resistors and 3 capacitors needed
Achieved ≈ 17 dB Gain, 0.9 dB Noise Figure for DAB-L band (1453 - 1491 MHz) and GPS;
Achieved ≈ 15 dB Gain, 1.0 dB Noise Figure at 1900 MHz
Table 1
Summary of Data
Frequency dB [S11]² dB [S21]²
MHz
dB [S12]²
dB [S22]² NF*
dB
IIP3
OIP3
IP1dB
OP1dB
dBm
dBm
dBm
dBm
1454
9.2
16.8
26.2
10.3
0.9
---
---
---
---
1470
9.3
16.7
26.1
10.4
0.8
+0.1
+16.8
-14.9
+0.8
1494
9.4
16.6
26.1
10.4
0.9
---
---
---
---
1575
9.7
16.3
25.7
10.5
0.9
---
---
---
---
1904
10.8
14.8
24.2
11.4
1.0
---
---
---
---
* Note that PCB loss is not extracted. If PCB loss were extracted, NF would be 0.1 to 0.2 dB lower.
Application Note
4
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Cross Sectional Diagram of PC Board
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Schematic Diagram
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Figure 2
Schematic Diagram
Application Note
5
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
•
•
Total external component count = 6 (No Chip Coils needed!)
3 capacitors
3 resistors
Total occupied PCB area ≅ 35 mm²
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
0.45
0.35
0.5
0.5
HLGF1011
Figure 4
Package Footprint of TSFP-4
Application Note
6
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Noise Figure, Plot, 1.2 GHz to 3.0 GHz. Center of Plot (x-axis) is 2.1 GHz.
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Figure 5
Noise Figure
Application Note
7
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Noise Figure, Tabular Data
From Rhode & Schwarz FSEK3 + FSEM30 + System PreAmp
Table 2
Noise Figure
Frequency
Noise Figure
1200 MHz
0.80 dB
1225 MHz
0.82 dB
1250 MHz
0.83 dB
1275 MHz
0.81 dB
1300 MHz
0.83 dB
1325 MHz
0.85 dB
1350 MHz
0.83 dB
1375 MHz
0.82 dB
1400 MHz
0.83 dB
1425 MHz
0.84 dB
1450 MHz
0.85 dB
1475 MHz
0.82 dB
1500 MHz
0.86 dB
1525 MHz
0.87 dB
1550 MHz
0.85 dB
1575 MHz
0.85 dB
1600 MHz
0.87 dB
1625 MHz
0.90 dB
1650 MHz
0.88 dB
1675 MHz
0.88 dB
1700 MHz
0.91 dB
1725 MHz
0.90 dB
1750 MHz
0.93 dB
1775 MHz
0.92 dB
1800 MHz
0.92 dB
1825 MHz
0.96 dB
1850 MHz
0.97 dB
1875 MHz
0.98 dB
1900 MHz
0.97 dB
1925 MHz
0.97 dB
1950 MHz
1.00 dB
1975 MHz
0.99 dB
2000 MHz
1.01 dB
2025 MHz
1.00 dB
2050 MHz
1.02 dB
2075 MHz
1.01 dB
2100 MHz
1.04 dB
2125 MHz
1.04 dB
Application Note
8
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Table 2
Noise Figure (cont’d)
Frequency
Noise Figure
2150 MHz
1.03 dB
2175 MHz
1.03 dB
2200 MHz
1.00 dB
2225 MHz
0.99 dB
2250 MHz
1.01 dB
2275 MHz
1.03 dB
2300 MHz
1.01 dB
2325 MHz
1.03 dB
2350 MHz
1.02 dB
2375 MHz
1.02 dB
2400 MHz
1.01 dB
2425 MHz
1.05 dB
2450 MHz
1.01 dB
2475 MHz
1.05 dB
2500 MHz
1.05 dB
2525 MHz
1.04 dB
2550 MHz
1.07 dB
2575 MHz
1.06 dB
2600 MHz
1.05 dB
2625 MHz
1.09 dB
2650 MHz
1.07 dB
2675 MHz
1.07 dB
2700 MHz
1.09 dB
2725 MHz
1.08 dB
2750 MHz
1.10 dB
2775 MHz
1.10 dB
2800 MHz
1.11 dB
2825 MHz
1.10 dB
2850 MHz
1.10 dB
2875 MHz
1.13 dB
2900 MHz
1.09 dB
2925 MHz
1.13 dB
2950 MHz
1.10 dB
2975 MHz
1.15 dB
3000 MHz
1.11 dB
Application Note
9
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Scanned Image of PC Board
Figure 6
Image of PC Board
Application Note
10
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Scanned Image of PC Board, Close-In Shot
Total PCB area used ≅ 35 mm²
Figure 7
Image of PC Board, Close-In Shot
Application Note
11
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Stability
Rhode and Schwarz ZVC Network Analyzer calculates and plots Stability Factor "K" in real time, from 5 MHz to
8 GHz. Note K < 1 from 5 MHz to 8 GHz; Amplifier is Unconditionally Stable > 700 MHz; K < 1 under 70 MHz,
with minimum value of K = 0.85 at 292 MHz.
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Figure 8
Plot of K(f)
Application Note
12
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Gain Compression at 1470 MHz
Amplifier is checked for 1 dB compression point at VCC = 3.0 V, IC = 9.2 mA (with VCE = 1.5 V) at both 1470 MHz.
An Agilent power meter was used to ensure accurate power levels are measured.
Output P1dB ≅ +0.8 dBm
Input P1dB ≅ +0.8 dBm - (Gain - 1 dB) = +0.8 dBm - 15.7 dB = -14.9 dBm
Table 3
Gain Compression at 1470 MHz
Pin, dBm
Pout, dBm
Gain, dB
-24.7
-8.0
16.7
-23.7
-7.0
16.7
-22.7
-6.0
16.7
-21.7
-5.0
16.7
-20.6
-4.0
16.6
-19.6
-3.0
16.6
-18.4
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16.4
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16.3
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0.0
16.0
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Figure 9
Plot of Gain Compression at 1470 MHz
Application Note
13
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
PLEASE NOTE - all plots are taken from Rohde And Schwarz ZVC Network Analyzer, with T = 25 °C,
source power ≈ -30 dBm.
Input Return Loss, Log Mag
5 MHz to 8 GHz Sweep
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Plot of Input Return Loss
Application Note
14
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Input Return Loss, Smith Chart
Reference Plane = Input SMA Connector on PC Board
5 MHz to 8 GHz Sweep
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Smith Chart of Input Return Loss
Application Note
15
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Forward Gain
5 MHz to 8 GHz Sweep
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Plot of Forward Gain
Application Note
16
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Reverse Isolation
5 MHz to 8 GHz
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Application Note
17
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Output Return Loss, Log Mag
5 MHz to 8 GHz
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Plot of Output Return Loss
Application Note
18
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Output Return Loss, Smith Chart
Reference Plane = Output SMA Connector on PC Board
5 MHz to 8 GHz Sweep
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Smith Chart of Output Return Loss
Application Note
19
Rev. 1.2, 2007-11-28
Application Note No. 128
Reduced Parts Count LNA for 1.4 - 2.0 GHz using the SiGe Transistor
Two-Tone Test, 1470 MHz
Input Stimulus for Amplifier Two-Tone Test.
f1 = 1470 MHz, f2 = 1471 MHz, -30 dBm each tone.
Input IP3 = -30 + (60.2 / 2) = +0.1 dBm
Output IP3 = +0.1 dBm +16.7 dB gain = 16.8 dBm
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Figure 16
Tow-Tone Test, Input Stimulus @ 1470 MHz
Application Note
20
Rev. 1.2, 2007-11-28