DESIGN APPLICATION NOTE -- AN-076
SGL-0363 GPS Application Circuit
Abstract
Circuit Details
RFMD SGL-0363 is a high performance
SiGe LNA designed for operation from DC to 6 GHz. This
application note illustrates application circuits for GPS
(Global Positioning System) frequency band (1575
MHz).
RFMD will provide the detailed layout (AutoCad format) to
users wishing to use the exact same layout and
substrate material shown in the following circuits. The
circuits recommended within this application note were
designed using the following PCB material:
Introduction
The application circuits herein were designed to achieve
the optimum combination of NF, input return loss, and
stability. All recommended components are standard
values available from well-known manufacturers.
Components specified in the bill of materials (BOM) have
known parasitics which in some cases are critical to the
circuit’s performance. Deviating from the recommended
BOM may result in a performance shift due to varying
parasitics Matching component placement is critical to
each circuit’s performance.
Simplified Device Schematic
Vpc
RF Out
Material: GETEK™ ML200C
Core thickness: 0.031”
Copper cladding: 0.5 oz both sides
Dielectric constant: 4.1 (at 1 MHz)
Dielectric loss tangent: 0.0089 (at 1 GHz)
Customers not wishing to use the exact material and
layouts shown in this application note can design their
own PCB using the critical transmission line
impedances and phase lengths shown in the BOMs and
layouts.
NOTE: Many of our sample evaluation boards may
come with an additional substrate & copper layer for
mechanical stability. It has been assumed that the
backside layer has no effect on the RF performance or
circuit design.
GPS
Matching
Network
Gnd
Active Bias
Network
RF In
GPS
Matching
Network
Contact amp-apps@RFMD.com for details.
Gnd
Performance Summary (Measured at 3.3V, 25C)
Freq. (GHz) NF (dB) Gain (dB) IRL (dB) ORL (dB) S12 (dB)
IIP3
1.54
1.43
17.2
-9.7
-21.2
-23.6
-1.7
1.55
1.43
17.1
-9.7
-23.3
-23.3
-1.7
1.56
1.44
17.1
-9.7
-23.9
-23.5
-1.6
1.57
1.46
17.1
-9.7
-24.9
-23.4
-1.6
1.58
1.47
17.0
-9.8
-25.5
-23.5
-1.6
1.59
1.49
17.0
-9.8
-25.4
-23.4
-1.6
1.6
1.50
16.9
-9.7
-24.9
-23.5
-1.6
OIP3
15.5
15.5
15.5
15.5
15.4
15.4
15.3
IM3
-61
-61
-61
-61
-61
-60
-60
P1dB
4.7
4.7
4.8
4.8
4.8
4.8
4.8
The information provided herein is believed to be reliable at press time.
RFMD assumes no responsibility for i naccuracies or omissions. RFMD assumes no responsibility for the
use of this information, and all such information shall be entirely at the user’s own risk. Prices and specifications are subj
ect to change without notice. No patent rights or licenses to any of the circuits
described herein are implied or granted to any third party. RFMD does not authorize or warrant any RFMD product for use in life-support devices and/or systems.
Copyright 2003 RFMD All worldwide rights reserved.
303 S. Technology Ct.
Broomfield, CO 80021
Phone: (800) SMI-MMIC
1
http://www.RFMD.com
EAN-104560 Rev A
DESIGN APPLICATION NOTE -- AN-076
SGL-0363 GPS Application Circuits
1575 MHz Application Circuit Data
Bill of Materials
C1
C2
C3
C4
C5
L1
L2
L3
R1
R2
1x
1x
1x
1x
1x
1x
1x
1x
1x
1x
TAJB105KLRH Rohm 1.0uF
MCH185C221JK Rohm 220pF
MCH185A8R2DK Rohm 8.2pF
MCH185A0R5CK Rohm 0.5pF
MCH185A8R2DK Rohm 8.2pF
LL1608-FS12NJ Toko 12nH
LL1608-FS5N6S Toko 5.6nH
LL1608-FS2N7S Toko 2.7nH
1.8Ω 0603 res (5%)
56Ω 0603 res (5%)
Connectors 2x PSF-S01-1mm GigaLane Co.
Heat sink
EEF-102059
PCB
125390-B
SGL-0363 1575 MHz Application Schematic
Note: Electrical lengths
are determined from
the center of a shunt component and a cut on
the center trace
56Ω
1.8Ω
Ζ=50Ω, 4.7°
Ζ=50Ω, 8.8°
303 S. Technology Ct.
Broomfield, CO 80021
Ζ=50Ω, 7.6°
Ζ=50Ω, 4.1°
Ζ=50Ω,12.2°
Ζ=50Ω, 5.1°
Ζ=50Ω, 6.1°
Phone: (800) SMI-MMIC
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http://www.RFMD.com
EAN-104560 Rev A
DESIGN APPLICATION NOTE -- AN-076
SGL-0363 GPS Application Circuits
Typical Performance - 1575 MHz Application Circuit (25°C)
Input Return Loss over Voltage
Gain over Voltage
24
-5
22
-10
20
S21(dB)
S11(dB)
0
-15
S11_3.3V
-20
S11_4.5V
-25
-30
1.54
S11_5V
1.55
S21_5V
18
16
1.56
1.57
1.58
Frequency (GHz)
1.59
12
1.54
1.6
Isolation over Voltage
1.55
1.56
1.57
1.58
Frequency (GHz)
1.59
1.6
1.59
1.6
Output Return Loss over Voltage
0
-5
-5
S12_3.3V
S12_4.5V
-10
S22_3.3V
S22_4.5V
-10
S12_5V
S22(dB)
S12(dB)
S21_4.5V
14
0
-15
-20
-25
-30
1.54
S21_3.3V
S22_5V
-15
-20
-25
1.55
1.56
1.57
1.58
Frequency (GHz)
1.59
1.6
-30
1.54
1.55
1.56
1.57
1.58
Frequency (GHz)
Broadband Gain over Voltage
30
20
S21(dB)
10
3.3V
4.5V & 5V
0
-10
-20
-30
0
303 S. Technology Ct.
Broomfield, CO 80021
1
2
3
4
Frequency (GHz)
Phone: (800) SMI-MMIC
3
5
6
http://www.RFMD.com
EAN-104560 Rev A
DESIGN APPLICATION NOTE -- AN-076
SGL-0363 GPS Application Circuits
Typical Performance - 1575 MHz Application Circuit (25°C)
IM3 vs. Frequency
-45
-50
3.3V
4V
4.5
5V
6
-55
IIP3 (dBm)
IM3 (dBc)
IIP3 vs. Frequency
8
-40
-60
-65
3.3V
4V
4.5V
5V
4
2
0
-70
-2
-75
-80
1.54
1.55
1.56
1.57
1.58
1.59
-4
1.54
1.6
1.55
Frequency (GHz)
18
16
4V
4.5V
5V
1.59
1.6
12
10
12
10
8
6
8
6
4
4
2
2
0
1.54
1.58
Ic vs. Vc
14
Ic (mA)
P1dB (dBm)
14
3.3V
1.57
Frequency (GHz)
P1dB vs. Frequency
20
1.56
1.55
1.56
1.57
1.58
1.59
0
1.6
3.3V
Frequency (GHz)
4V
4.5V
5V
Frequency (MHz)
Noise Figure over Voltage
NF (dB)
1.9
1.8
3.3V
4V
1.7
4.5V
5V
1.6
1.5
1.4
1.3
1.54
1.55
1.56
1.57
1.58
1.59
1.6
Frequency (GHz)
303 S. Technology Ct.
Broomfield, CO 80021
Phone: (800) SMI-MMIC
4
http://www.RFMD.com
EAN-104560 Rev A