Single stage LNA for GPS using the MCH4009

Single stage LNA for GPS
Using the MCH4009
Application Note
http://onsemi.com
Overview
This application note explains about ON Semiconductor’s MCH4009 which is used as a Low
Noise Amplifier (LNA) for GPS (Global Positioning System).
The MCH4009 is a silicon bipolar transistor best suited for high-frequency applications
which is assembled in the 4-pin surface mount package.
For information about the performance, please refer to the datasheet of this product.
Since the evaluation board is adjusted to achieve optimal performance in GPS (1575 MHz),
the product can provide 14.1dB gain and 1.5dB noise figure.
A standard material FR4 is used for the printed circuit board (PCB).
Please note that the losses of the PCB and the SMA connector are not excluded from the
noise figure.
Semiconductor Components Industries, LLC, 2014
June, 2014 – Rev. 0
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Single stage LNA for GPS Using the MCH4009
■Summary of Data
Ta = 25 °C, Input Power = -40 dBm
Parameter
DC Voltage
DC Current
Power Gain
Noise Figure
Input Return Loss
Output Return Loss
Isolation
Gain 1dB
Compression
Input Power
Input 3rd Order
Intercept Point
Symbol
Condition
Result
Unit
Vcc
3.0
V
Icc
4.9
mA
Gp
f = 1575 MHz
14.1
dB
NF
f = 1575 MHz
1.5
dB
RLin
f = 1575 MHz
10.4
dB
RLout
f = 1575 MHz
8.4
dB
ISL
f = 1575 MHz
21.1
dB
Pin1dB
f = 1575 MHz
-15
dBm
IIP3
f1 = 1575 MHz
f2 = 1576 MHz
-0.5
dBm
Pin = -26 dBm
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Single stage LNA for GPS Using the MCH4009
■Circuit Design
Vcc = 3V
C4
R1
C3
R2
L1
L2
OUTPUT
INPUT
C2
L3
C1
L4
TR1
Emitter Inductance
W = 0.3 mm, L = 1.5 mm
■Evaluation Board
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Single stage LNA for GPS Using the MCH4009
■Bill of Materials
Item
Symbol
Value
Manufacturer
Size
Bip-Tr
TR1
MCH4009
ON Semiconductor
SC82
C1
C2
6 pF
100 pF
Murata GRM155
Murata GRM155
1005
1005
C3
1000 pF
Murata GRM155
1005
C4
1000 pF
Murata GRM155
1005
R1
150 Ω
Various
1005
Capacitor
Resistor
Inductor
Material
R2
22 kΩ
Various
1005
L1
8.2 nH
TDK MLG1005S
1005
L2
33 nH
TDK MLG1005S
1005
L3
1 nH
TDK MLG1005S
1005
L4
2.7 nH
TDK MLG1005S
1005
-
FR4
-
20 x 14 mm
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Single stage LNA for GPS Using the MCH4009
■Power Gain
30
Power Gain ‐ dB
25
20
15
10
5
0
500
1000
1500
Frequency ‐ MHz
2000
2500
1000
1500
Frequency ‐ MHz
2000
2500
■Isolation
0
‐5
Isolation ‐ dB
‐10
‐15
‐20
‐25
‐30
‐35
‐40
500
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Single stage LNA for GPS Using the MCH4009
■Input Return Loss
Input Return Loss ‐ dB
0
‐5
‐10
‐15
‐20
500
1000
1500
Frequency ‐ MHz
2000
2500
1000
1500
Frequency ‐ MHz
2000
2500
■Output Return Loss
Output Return Loss ‐ dB
0
‐5
‐10
‐15
‐20
500
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Single stage LNA for GPS Using the MCH4009
■Noise Figure
4
Noise Figure ‐ dB
3.5
3
2.5
2
1.5
1
0.5
0
1450
1500
1550
1600
Frequency ‐ MHz
1650
1700
■S11, S21, S12, S22 Wide Span
20
S21
S11,S21,S12,S22 ‐ dB
10
S22
0
‐10
S11
‐20
‐30
‐40
S12
‐50
‐60
‐70
100
1000
Frequency ‐ MHz
10000
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Single stage LNA for GPS Using the MCH4009
■Smith Chart
Input Return Loss
S(3,3)
1575 MHz
1500
MHz toto1650
MHz
freq
(1.500GHz
1.650GHz)
■Smith Chart
Output Return Loss
S(4,4)
1575 MHz
freq
(1.500GHz
1.650GHz)
1500
MHz toto1650
MHz
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Single stage LNA for GPS Using the MCH4009
■Gain 1dB Compression Point
10
Output Power ‐ dBm
5
0
‐5
‐10
‐15
‐20
‐25
‐30
‐45
‐40
‐35
‐30
‐25
‐20
Input Power ‐ dBm
‐15
‐10
‐5
■Input 3rd Order Intercept Point
f1 =1575 MHz, f2 = 1576 MHz, Pin = -26 dBm
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Single stage LNA for GPS Using the MCH4009
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