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PDF MGA-52543 Data sheet ( Hoja de datos )
| Número de pieza | MGA-52543 | |
| Descripción | Low Noise Amplifier | |
| Fabricantes | Agilent | |
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Agilent MGA-52543
Low Noise Amplifier
Data Sheet
Features
• Lead-free Option Available
Description
Agilent Technologies’ MGA-52543
is an economical, easy-to-use GaAs
MMIC Low Noise Amplifier (LNA),
which is designed for use in LNA
and driver stages. While a capable
RF/microwave amplifier for any
low noise and high linearity 0.4 to
6 GHz application, the LNA focus
is Cellular/PCS base stations.
To attain NFmin condition, some
simple external matching is re-
quired. The MGA-52543 features a
calculated NFmin of 1.61 dB and 15
dB associated gain at 1.9 GHz from
a cascode stage, feedback FET
amplifier. The input and output are
partially matched to be near 50 Ω.
For base station radio card unit
LNA application where better than
2:1 VSWR is required, a series
inductor on the input and another
series inductor on the output can
be added externally. The resulting
Noise Figure is typically 1.9 dB
with 14 dB Gain at 1.9 GHz. With a
single 5.0V supply, the LNA
Simplified Schematic
typically draws 53 mA. This
alignment results in an Input
Intercept Point of 17.5 dBm.
The MGA-52543 is a GaAs MMIC,
fabricated using Agilent
Technologies’ cost-effective,
reliable PHEMT (Pseudomorphic
High Electron Mobility Transistor)
process. It is housed in the SOT-343
(SC70 4-lead) package. This
package offers miniature size
(1.2 mm by 2.0 mm), thermal
dissipation, and RF characteristics.
Surface Mount Package
SOT-343/4-lead SC70
Pin Connections and
Package Marking
3
INPUT
1
GND
4
GND
2
OUTPUT
& Vd
• Operating frequency: 0.4 GHz ~
6.0 GHz
• Minimum noise figure: 1.61 dB at
1.9 GHz
• Associated gain : 15 dB at 1.9 GHz
• 1.9 GHz performance tuned for
VSWR < 2:1
Noise figure: 1.9 dB
Gain: 14 dB
P1dB: +17.5 dBm
Input IP3: +17.5 dBm
• Single supply 5.0 V operation
Applications
• Cellular/PCS base station radio
card LNA
• High dynamic range amplifier for
base stations, WLL, WLAN, and
other applications
Attention:
Observe precautions for
handling electrostatic
sensitive devices.
ESD Machine Model (Class A)
ESD Human Body Model (Class 1A)
Refer to Agilent Application Note A004R:
Electrostatic Discharge Damage and Control.
Vd 5V
360 pF
22 nH
3.3 nH
2.2 nH 18 pF
MGA-52543
1 page  
MGA-52543 Typical Performance, continued
RF
Input
ICM Fixture
Bias
Tee
Vd
RF
Output
Figure 18. Test Circuit for Figures 19 through 24 (Input and Output presented to 50Ω).
3.0
2.6
2.2
1.8
1.4
1.0
0
12 3456
FREQUENCY (GHz)
Figure 19. Noise Figure vs. Frequency
(in 50Ω).
7
-15
-19
-23
-27
-31
-35
0
12 3456
FREQUENCY (GHz)
Figure 22. Isolation vs. Frequency.
7
20
17
14
11
8
5
012 345
FREQUENCY (GHz)
Figure 20. Gain vs. Frequency.
6
7
5
4
3
2
In
1 Out
012 3456 7
FREQUENCY (GHz)
Figure 23. Input and Output VSWR vs.
Frequency.
32
28
24
OIP3
P1dB
IIP3
20
16
12
012 3456 7
FREQUENCY (GHz)
Figure 21. Input IP3, Output IP3 and P1dB vs.
Frequency.
70
60
50
40
30
20
10
0
012 345
Vs (V)
Figure 24. Current vs. Vd.
Id (-40°C)
Id (+25°C)
Id (+85°C)
678
5
5 Page 
2.2 nH 18 pF
42
3.3 nH
22 nH
360 pF
+5V
Figure 7. Schematic of 1.9 GHz Circuit.
A schematic diagram of the
complete 1.9 GHz circuit with the
input and output match and DC
biasing is shown in Figure 7.
DC bias is applied to the
MGA-52543 through the RFC at
the RF output pin. The power
supply connection is bypassed to
ground with capacitor C2. Provi-
sion is made for an additional
bypass capacitor, C3, to be added
to the bias line near the +5 volt
connection. C3 will not normally
be needed unless several stages
are cascaded using a common
power supply.
Since the input terminal of the
MGA-52543 is at ground potential,
an input DC blocking capacitor is
not needed unless the amplifier is
connected to a preceding stage
that has a voltage present at this
point. The values of the DC
blocking and RF bypass capaci-
tors should be chosen to provide
a small reactance (typically < 5Ω)
at the lowest operating frequency.
For this 1.9 GHz design example,
18 pF capacitors with a reactance
of 4.5 Ω are adequate. The reac-
tance of the RF choke (RFC)
should be high (i.e., several
hundred ohms) at the lowest
frequency of operation. A 22 nH
inductor with a reactance of 262 Ω
at 1.9 GHz is sufficiently high to
minimize the loss from circuit
loading.
The completed 1.9 GHz amplifier
for this example with all compo-
nents and SMA connectors
assembled is shown in Figure 8.
The amplifier input intercept point
IIP3 was measured at a nominal
+17.5 dBm. P1dB measured
+17.5 dBm.
L1 3.3 nH LL1608-FH3N3
L2 2.2 nH LL2012-F2N2
RFC 22 nH LL1608-FH22N
C1 18 pF chip capacitor
C2 470 pF chip capacitor
C3 10000 pF chip capacitor
Table 1. Component Parts List for the
MGA-52543 Amplifier at 1900 MHz.
Performance of MGA-52543
1900 MHz Amplifier
The amplifier is biased at a Vd of
5 volts. The measured noise figure
and gain of the completed ampli-
fier is shown in Figure 9. Noise
figure is a nominal 2.0 to 2.2 dB
from 1800 through 2000 MHz. Gain
is a minimum of 14.3 dB from
1800 MHz through 2000 MHz.
Measured input and output return
loss is shown in Figure 10. The
input return loss at 1900 MHz is
11.2 dB with a corresponding
output return loss of 21.9 dB.
16
Gain
12
8
4
NF
0
1.6 1.8 2 2.2 2.4 2.6
FREQUENCY (GHz)
Figure 9. Gain and Noise Figure Results.
0
-4
Input RL
-8
-12
-16
Output RL
-20
-24
1.6
1.8 2 2.2 2.4
FREQUENCY (GHz)
2.6
Figure 10. Input and Output Return Loss
Results.
Agilent
Technologies
MGA - 5X
IP 9/99
L2 C1
IN L1 42
RFC
C2
OUT
C3
Vd
Figure 8. Complete 1.9 GHz Amplifier Circuit.
11
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