AM Radio Amplifier with Filter Using the NSVJ3557SA3

AM Radio Amplifier with Filter
Using the NSVJ3557SA3
Application Note
Overview
This application note explains about ON Semiconductor’s
NSVJ3557SA3 which is used as a Low Noise Amplifier
(LNA) for AM Radio.
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The NSVJ3557SA3 is a silicon junction field effect transistor
best suited for high-frequency applications which is
assembled in the 3-pin surface mount package.
For information about the performance, please refer to the
datasheet of this product.
The evaluation board is adjusted to provide +9.5dB gain in
AM band (520 to 1720 kHz) and reduce gain to −80dB in FM
band (76 to 108 MHz).
A standard material FR4 is used for the printed circuit board
(PCB).
© Semiconductor Components Industries, LLC, 2015
May 2015- Rev. 0
1
Publication Order Number:
ANDNSVJ3557SA3_1/D
AM Radio Amplifier with Filter Using the NSVJ3557SA3
■Summary of Performance
Ta = 25ºC, Input Power = -40 dBm, Zo = 50 Ω
Parameter
Symbol
DC Voltage
DC Current
Result
Unit
Vdd
5.0
V
Idd
16.8
mA
Gp1
Condition
f = 520 kHz
9.42
f = 1120 kHz
9.70
f = 1720 kHz
9.51
f = 76 MHz
-89.0
f = 90 MHz
-91.0
f = 108 MHz
-88.3
f = 520 kHz
-0.03
f = 1120 kHz
-0.22
f = 1720 kHz
-0.55
f = 520 kHz
-0.35
f = 1120 kHz
-0.66
f = 1720 kHz
-1.35
f = 520 kHz
-46.3
f = 1120 kHz
-39.8
f = 1720 kHz
-36.1
Power Gain
dB
Gp2
Input Return Loss
Output Return Loss
Isolation
RLin
RLout
ISL
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2
dB
dB
dB
AM Radio Amplifier with Filter Using the NSVJ3557SA3
■Circuit Diagram
Vdd = 5V
L4
C2
INPUT
C4
L1
L2
R7
R2
R4
FET1
R1
C1
■Evaluation Board
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3
L3
C5
OUTPUT
R5
R3
R6
C7
C3
C6
AM Radio Amplifier with Filter Using the NSVJ3557SA3
■Bill of Materials
Item
Symbol
Value
Manufacture
Size
J-FET
FET1
NSVJ3557SA3
ON Semiconductor
SC-59
C1
10 pF
Murata GRM155
1005
C2
12 pF
Murata GQM188
1608
C3
120 pF
Murata GRM155
1005
C4,C5,C6,C7
0.1 uF
ROHM MCH182CN
1608
R1
22 kΩ
Various
1608
R2
270 Ω
Various
1608
R3
100 kΩ
Various
1608
R4
150 Ω
Various
1608
R5
100 kΩ
Various
1608
R6
10 Ω
Various
1608
R7
120 Ω
Various
1608
L1,L2,L3
3.3 uH
TDK NLV25T
2520
L4
330 uH
TDK NLCV32T
3225
Capacitor
Resistor
Inductor
Material
FR-4
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4
25 x 13 mm
AM Radio Amplifier with Filter Using the NSVJ3557SA3
12
0
10
‐10
‐20
8
Isolation ‐ dB
Power Gain ‐ dB
■Measurement Results
6
4
‐30
‐40
‐50
2
‐60
0
‐70
0.1
1
Frequency ‐ MH z
10
0.1
10
Figure 2 Isolation vs. Frequency
2
2
0
0
Output Return Loss ‐ dB
Input Return Loss ‐ dB
Figure 1 Power Gain vs. Frequency
1
Frequency ‐ MH z
‐2
‐4
‐6
‐2
‐4
‐6
‐8
‐8
‐10
‐10
0.1
1
Frequency ‐ MHz
10
Figure 3 Input Return Loss vs. Frequency
0.1
1
Frequency ‐ MHz
Figure 4 Output Return Loss vs. Frequency
520 kHz to 1720 KHz
520 kHz to 1720 kHz
Figure 5 Smith Chart S11
Figure 6 Smith Chart S22
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5
10
AM Radio Amplifier with Filter Using the NSVJ3557SA3
20
10
0
‐10
‐20
‐30
‐40
‐50
‐60
‐70
‐80
‐90
‐100
12
S21
S11
↓
8V
↓ 4V
↓
↑
3V
10
↑
S22
Power Gain ‐ dB
S11,S21,S12,S22 ‐ dB
■Measurement Results
S12
8
6
4
2
0
0.1
1
10
Frequency ‐ MHz
100
1000
0.1
Figure 7 S11,S21,S12,S22 Wide Span
1
Frequency ‐ MHz
Figure 8 Voltage Dependency
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6
10
AM Radio Amplifier with Filter Using the NSVJ3557SA3
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nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including
without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can
and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
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not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or
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