A pp li c at i on N ot e , R ev . 1. 2 , S e pt 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 4
L o w N o i s e A m p l i fi e r f or 2 .3 t o 2 .5 G H z
A p pl i c a t i o n s us i n g t h e S i G e B F P 6 4 0F T r a n s i s t or
R F & P r o t e c ti o n D e v i c e s
Edition 2007-09-06
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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Application Note No. 124
Application Note No. 124
Revision History: 2007-09-06, Rev. 1.2
Previous Version: 2005-08-19, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Document layout change
Application Note
3
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
1
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe
BFP640F Tranistor
Applications
•
•
2.4 GHz ISM band (Bluetooth, Cordless Phone, Wireless LAN, ZigBee, etc.)
2.33 GHz “SDARS” Satellite Radio (e.g. “XM Radio”)
Overview
•
•
•
BFP640F in TSFP-4 package is evaluated for 2.3 - 2.5 GHz LNA application. Note TSFP-4 package is only
1.4 x 1.2 x 0.55 mm high. Printed Circuit Board used is Infineon Part Number 640F-021904 Rev A. Standard
FR4 material is used in a three-layer PCB. Please refer to cross-sectional diagram below.
Low-cost, standard "0402" case-size SMT passive components are used throughout. Please refer to
schematic and Bill Of Material. The LNA is unconditionally stable from 5 MHz to 6 GHz.
Total PCB area used for the single LNA stage is < 40 mm². Total Parts count, including the BFP640 transistor,
is 12.
Target Specifications
•
Design Goals: Gain = 15 dB min, Noise Figure = 0.8 dB max, Input / Output Return Loss 10 dB or better,
current < 7 mA from a 3.0 V power supply
Summary of Results
T = 25 °C
Table 1
Summary of Results
Frequency
MHz
dB[s11]² dB[s21]² dB[s12]² dB[s22]² NF *
dB
IIP3
OIP3
IP1dB
OP1dB
dBm
dBm
dBm
dBm
3000
6.6
13.8
18.9
8.3
---
---
---
---
---
3500
9.6
11.9
19.2
6.4
---
---
---
-19.7
-8.8
4000
7.3
10.6
19.1
10.1
---
---
---
---
---
Achieved ≅ 15 dB gain, 0.85 dB Noise Figure at 2400 MHz from 3.0 V supply drawing 6.5 mA. Note 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.
Input P1dB = -10 dBm @ 2400 MHz. Outstanding Input Third Order Intercept (IIP3) of +13.9 dBm at 2400 MHz.
PCB Cross - Section Diagram
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Application Note
4
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
TSFP-4 Package Details (dimensions in millimeters)
Note maximum package height is 0.59 mm / 0.023 inch.
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 2
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 3
Package Footprint of TSFP-4
Application Note
5
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Summary of LNA Data
T = 25 °C, network analyzer source power = -25 dBm
Table 2
Summary of LNA Data
Parameter
Result
Comments
Frequency Range
2300 to 2500 MHz
SDARS band, 2.4 GHz ISM band
coverage
DC Current
6.5 mA @ 3.0 V
DC Voltage, VCC
3.0 V
Collector-Emitter Voltage, VCE
2.5 V
BFP640: VCEmax = 4.0 V
Gain
15.6 dB @ 2330 MHz
15.3 dB @ 2400 MHz
15.0 dB @ 2483 MHz
Negligible change in gain or matching
at 3.3 or 3.0 Volts
Noise Figure
0.86 dB @ 2330 MHz
0.85 dB @ 2400 MHz
0.84 dB @ 2483 MHz
See Figure 5 and Table 4
(These values do NOT extract PCB
losses, etc. resulting from FR4 board
and passives used on PCB - these
results are at input SMA connector)
Input P1dB
+10.0 dBm @ 2400 MHz
See Figure 10
Output P1dB
+4.3 dBm @ 2400 MHz
rd
Input 3 Order Intercept
+13.9 dBm @ 2400 MHz
Output 3rd Order Intercept
+29.2 dBm @ 2400 MHz
Input Return Loss
11.8 dB @ 2330 MHz
12.9 dB @ 2400 MHz
14.5 dB @ 2483 MHz
Output Return Loss
16.6 dB @ 2330 MHz
14.2 dB @ 2400 MHz
12.2 dB @ 2483 MHz
Reverse Isolation
20.9 dB @ 2330 MHz
20.7 dB @ 2400 MHz
20.5 dB @ 2483 MHz
Application Note
6
Two tones, 2400 & 2401 MHz, 16 dBm each tone. See Figure 17
and Figure 18
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Bill of Material
Table 3
Bill of Material
REFERENCE
DESIGNATOR
VALUE
MANUFACTURER
CASE
SIZE
FUNCTION
C1
33 pF
Various
0402
DC Blocking, Input. Also, using cap
above self-resonance makes it slightly
inductive, slightly improving input
match.
C2
1.2 pF
Various
0402
DC Block, Output. Also Influences
Output and Input Impedance Match
C3
0.022 µF
Various
0402
Decoupling, Low Frequency. Also
improves Third-Order Interception
C4
8.2 pF
Various
0402
Decoupling (RF Short)
C5
5.6 pF
Various
0402
Decoupling (RF Short). Also has
influence on output match and
stability.
C6
0.022 µF
Various
0402
Decoupling, Low Frequency
L1
12 nH
Murata LQP15HN Series Low 0402
Cost Inductor
RF Choke at Input
L2
3.9 nH
Murata LQP15HN Series Low 0402
Cost Inductor
RF Choke + Impedance Match at
Output
R1
10 Ω
Various
0402
Stability Improvement
R2
43 kΩ
Various
0402
Brings Bias Current / Voltage into Base
of Transistor
R3
68 Ω
Various
0402
Provides some Negative Feedback for
DC BIAS / DC Operation Point to
Compensate for Variations in
Transistor DC Current Gain,
Temperature Variations, etc.
Q1
-
Infineon Technologies
TSFP-4
BFP640F B7HF Transistor
J1, J2
-
Johnson 142-0701-841
-
RF Input / Output Connectors
J3
-
AMP 5 Pin Header MTA-100 Series 640456-5 (standard pin
plating) or 641215-5 (gold
plated pins)
Application Note
7
DC Connector
Pins 1,5 = GROUND
Pin 3 = VCC
Pins 2,4 = no connection
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Schematic Diagram for 2300 - 2500 MHz LNA
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Application Note
8
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Noise Figure, Plot. Center of Plot (x-axis) is 2400 MHz.
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Noise Figure
Application Note
9
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Noise Figure, Tabular Data
2232.5 MHZ to 2442.5 MHz
From Rhode & Schwarz FSEK3 + FSEM30
System Preamplifier = MITEQ SMC-02
Table 4
Noise Figure
Frequency
Noise Figure
2200 MHz
0.88 dB
2210 MHz
0.84 dB
2220 MHz
0.88 dB
2230 MHz
0.86 dB
2240 MHz
0.87 dB
2250 MHz
0.88 dB
2260 MHz
0.85 dB
2270 MHz
0.85 dB
2280 MHz
0.87 dB
2290 MHz
0.86 dB
2300 MHz
0.87 dB
2310 MHz
0.88 dB
2320 MHz
0.88 dB
2330 MHz
0.86 dB
2340 MHz
0.85 dB
2350 MHz
0.88 dB
2360 MHz
0.85 dB
2370 MHz
0.89 dB
2380 MHz
0.85 dB
2390 MHz
0.86 dB
2400 MHz
0.85 dB
2410 MHz
0.91 dB
2420 MHz
0.90 dB
2430 MHz
0.89 dB
2440 MHz
0.87 dB
2450 MHz
0.87 dB
2460 MHz
0.86 dB
2470 MHz
0.89 dB
2480 MHz
0.84 dB
2490 MHz
0.86 dB
2500 MHz
0.88 dB
2510 MHz
0.90 dB
2520 MHz
0.89 dB
2530 MHz
0.86 dB
2540 MHz
0.88 dB
2550 MHz
0.87 dB
Application Note
10
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Table 4
Noise Figure (cont’d)
Frequency
Noise Figure
2560 MHz
0.89 dB
2570 MHz
0.87 dB
2580 MHz
0.89 dB
2590 MHz
0.88 dB
2600 MHz
0.89 dB
Application Note
11
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Scanned Image of PC Board
Figure 6
Image of PC Board
Application Note
12
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Scanned Image of PC Board, Close-In Shot
Figure 7
Image of PC Board, Close-In Shot
Application Note
13
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Scanned Image of PC Board, Backside of PSB
Figure 8
Image of PC Board, Backside of PCB
Application Note
14
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Stability Factor "K" and Stability Measure "B1”
Note that K > 1 and B1 > 0, the amplifier is unconditionally stable. Measured LNA s-parameters were taken on a
Network Analyzer & then imported into GENESYS simulation package, which calculates and plots K and B1.
Figure 9
Plot of K(f) and B1(f)
Application Note
15
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Power Sweep at 2400 MHz (CW)
Source Power (Input) swept from -35 to -7 dBm
Input P1dB -10.0dBm
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Figure 10
Plot of Power Sweep (@ 2400 MHz)
Application Note
16
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Input Return Loss, Log Mag
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Figure 11
Plot of Input Return Loss
Application Note
17
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Input Return Loss, Smith Chart
Reference Plane = Input SMA RF Connector
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Figure 12
Smith Chart of Input Return Loss
Application Note
18
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Forward Gain, wide Sweep
5 MHz to 6 GHz
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Figure 13
Plot of Forward Gain
Application Note
19
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Reverse Isolation
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Figure 14
Plot of Reverse Isolation
Application Note
20
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Output Return Loss, Log Mag
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Figure 15
Plot of Output Return Loss
Application Note
21
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Output Return Loss, Smith Chart
Reference Plane = Output SMA RF Connector
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Figure 16
Smith Chart of Output Return Loss
Application Note
22
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
Input Stimulus for Amplifier Two-Tone Test
f1 = 2400 MHz, f2 = 2401 MHz, -16 dBm each tone.
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Figure 17
Tow-Tone Test, Input Stimulus
Application Note
23
Rev. 1.2, 2007-09-06
Application Note No. 124
Low Noise Amplifier for 2.3 to 2.5 GHz Applications using the SiGe BFP640F
LNA Response to Two-Tone Test
Input IP3 = -16 + (59.8/2) = +13.9 dBm
Output IP3 = +13.9 dBm + 15.3 dB gain = +13.9 dBm
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Figure 18
Tow-Tone Test, LNA Response
Application Note
24
Rev. 1.2, 2007-09-06