AN125

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 5
L N A f or S at e l l i t e D i g i t al M u l t i m ed i a B r o a d c a s ti n g
A p pl i c a t i o n s us i n g B F P 6 4 0 F S i G e T r an s i s t o r
R F & P r o t e c ti o n D e v i c e s
Edition 2007-11-19
Published by
Infineon Technologies AG
81726 München, Germany
© Infineon Technologies AG 2009.
All Rights Reserved.
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Application Note No. 125
Application Note No. 125
Revision History: 2007-11-19, Rev. 1.2
Previous Version: 2004-09-08, Rev. 1.1
Page
Subjects (major changes since last revision)
All
Small changes in figure descriptions
Application Note
3
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
1
LNA for Satellite Digital Multimedia Broadcasting Applications
using BFP640F SiGe Transistor
Overview
•
•
•
•
•
BFP640F is investigated for use as an LNA for a 2630 - 2655 MHz Digital Multimedia Broadcasting ("DMB")
application.
Design Goals: Gain =15 dB, Noise Figure < 1.2 dB, Input / Output Return Loss 10 dB or better, current < 10 mA
from a 1.8 V power supply, Output P1dB > -5 dBm
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.
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 approximately 35 mm². Total Parts count, including the
BFP640F transistor, is 12.
Achieved ≅ 14 dB gain, 0.9 dB Noise Figure from 2400-2800 MHz from a 1.8 V supply, drawing 6.8 mA.
Outstanding Input 3rd Order Intercept of +10.5 dBm. Note noise figure result does NOT "back out" FR4 PCB
losses - if the PCB loss at LNA input were extracted, Noise Figure result would be approximately 0.2 dB lower.
Amplifier is unconditionally stable from 5 MHz to 6 GHz.
PCB Cross - Section Diagram
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Figure 1
PCB - Cross Sectional Diagram
Application Note
4
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
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, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Summary of LNA Data
T = 25 °C, network analyzer source power = -25 dBm
Table 1
Summary of LNA Data
Parameter
Result
Frequency Range
2630 - 2655 MHz (can go wider)
DC Current
6.8 mA
DC Voltage, VCC
1.8 V
Collector-Emitter Voltage, VCE
1.5 V
Gain
14.2 dB @ 2630 MHz
14.2 dB @ 2642.5 MHz
14.1 dB @ 2655 MHz
Noise Figure
0.9 dB @ 2630 MHz
0.9 dB @ 2642.5 MHz
0.9 dB @ 2655 MHz
See noise figure plot and tabular data,
pages 6 and 7.
(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
-9.3 dBm @ 2640 MHz
See input power sweep vs. gain plot
on page 11.
Output P1dB
+3.9 dBm @ 2640 MHz
rd
Comments
BFP640: VCEmax = 4.0 V
Input 3 Order Intercept
+10.5 dBm @ 2642.5 MHz
Output 3rd Order Intercept
+24.7 dBm @ 2642.5 MHz
Input Return Loss
12.8 dB @ 2630 MHz
12.9 dB @ 2642.5 MHz
13.0 dB @ 2655 MHz
Output Return Loss
13.6 dB @ 2630 MHz
13.4 dB @ 2642.5 MHz
13.2 dB @ 2655 MHz
Reverse Isolation
19.7 dB @ 2630 MHz
19.7 dB @ 2642.5 MHz
19.6 dB @ 2655 MHz
Application Note
6
(For Test: Two tones, f1=2642 MHz,
f2=2643 MHz, -18 dBm each tone).
See plot on pages 16 - 17
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Bill of Material
Table 2
Bill of Material
REFERENCE
DESIGNATOR
VALUE
MANUFACTURER
CASE
SIZE
FUNCTION
C1
8.2 pF
Various
0402
DC Blocking, Input.
C2
1.5 pF
Various
0402
DC Block, Output. Also Influences
Output and Input Impedance Match
C3
0.1 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 stability.
C6
0.1 µF
Various
0402
Decoupling, Low Frequency
L1
10 nH
Murata LQG15H Series Low
Cost Inductor
0402
RF Choke at Input
L2
3.6 nH
Murata LQP15M Series
Inductor
0402
RF Choke + Impedance Match at
Output
R1
10 Ω
Various
0402
Stability Improvement
R2
20 kΩ
Various
0402
Brings Bias Current / Voltage into Base
of Transistor
R3
30 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 SiGe 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, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Schematic Diagram for 2.6 GHz BFP640F LNA
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Schematic Diagram
Application Note
8
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Noise Figure, Plot. Center of Plot (x-axis) is 2642.5 MHz.
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Figure 5
Noise Figure
Application Note
9
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Noise Figure, Tabular Data
From Rhode & Schwarz FSEK3 + FSEM30
System Preamplifier = MITEQ SMC-02
Table 3
Noise Figure
Frequency
Noise Figure
2392.5 MHz
0.86 dB
2417.5 MHz
0.86 dB
2442.5 MHz
0.85 dB
2467.5 MHz
0.89 dB
2492.5 MHz
0.87 dB
2517.5 MHz
0.90 dB
2542.5 MHz
0.87 dB
2567.5 MHz
0.88 dB
2592.5 MHz
0.86 dB
2617.5 MHz
0.91 dB
2642.5 MHz
0.88 dB
2667.5 MHz
0.88 dB
2692.5 MHz
0.88 dB
2717.5 MHz
0.90 dB
2742.5 MHz
0.90 dB
2767.5 MHz
0.90 dB
2792.5 MHz
0.93 dB
2817.5 MHz
0.89 dB
2842.5 MHz
0.92 dB
2867.5 MHz
0.90 dB
2892.5 MHz
0.91 dB
Application Note
10
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Scanned Image of PC Board
Figure 6
Image of PC Board
Application Note
11
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Scanned Image of PC Board, Close-In Shot
Figure 7
Image of PC Board, Close-In Shot
Application Note
12
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
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 8
Plot of K(f) and B1(f)
Application Note
13
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Power Sweep at 2640 MHz (CW)
Source Power (Input) swept from -35 to -7 dBm
Input P1dB ≅ -9.3 dBm
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Figure 9
Plot of Power Sweep (@ 2640 MHz)
Application Note
14
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Input Return Loss, Log Mag, Wide Sweep
5 MHz - 6 GHz
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Figure 10
Plot of Input Return Loss, Wide Sweep
Application Note
15
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Forward Gain, Wide Sweep
5 MHz - 6 GHz
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Figure 11
Plot of Forward Gain
Application Note
16
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Reverse Isolation, Wide Sweep
5 MHz - 6 GHz
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Figure 12
Plot of Reverse Isolation
Application Note
17
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Output Return Loss, Log Mag, Wide Sweep
5 MHz - 6 GHz
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Figure 13
Plot of Output Return Loss
Application Note
18
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
Input Stimulus for Amplifier Two-Tone Test
f1 = 2642 MHz, f2 = 2643 MHz, -18 dBm each tone.
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Figure 14
Tow-Tone Test, Input Stimulus
Application Note
19
Rev. 1.2, 2007-11-19
Application Note No. 125
LNA for Satellite Digital Multimedia Broadcasting Applications using
LNA Response to Two-Tone Test
Input IP3 = -18 + (56.9/2) = +10.5 dBm
Output IP3 = +10.5 dBm + 14.2 dB gain = + 24.7 dBm
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Figure 15
Tow-Tone Test, LNA Response
Application Note
20
Rev. 1.2, 2007-11-19
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