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MGA83563 Datasheet(PDF) 13 Page - Agilent(Hewlett-Packard)

Part # MGA83563
Description  22 dBm PSAT 3V Power Amplifier for 0.5-6 GHz Applications
PDF  24 Pages
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Manufacturer  HP [Agilent(Hewlett-Packard)]
Direct Link  http://www.home.agilent.com
Logo HP - Agilent(Hewlett-Packard)

MGA83563 Datasheet(HTML) 13 Page - Agilent(Hewlett-Packard)

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13
A
1
1
C
A (
Γ
ms*)
B
2
-2
B
0.5
0.5
0.2
-0.2
0.2
2
-0.5
-1
MLIN
RF
Input
C (50
Ω)
L1
Figure 25. Initial Small Signal Input
Match.
The addition of a 0.15 inch length
(actual length on FR-4) of 50
Ω
transmission line rotates Point A
around to Point B on the R = 1
circle of the Smith chart. A series
2.5 nH inductor (L1) is then all
that is required to complete the
match to 50
Ω at Point C.
While the input impedance of the
MGA-83563 is somewhat isolated
from the nonlinear effects of the
saturated output stage, some
empirical optimization of the
input inductor may increase the
input return loss still further. The
input is easily fine-tuned under
large signal conditions by observ-
ing the input return loss while an
input power of +4 dBm is applied
to the amplifier. The input
inductor is then “swept” by
placing various values of chip
inductors across the gap provided
in the 50
Ω line at the input of the
MGA-83563. For this example
amplifier, increasing the inductor
from the initial small signal value
of 2.5 nH to 2.7 nH was found to
provide the best input match. The
final input circuit tuned as for
large signal conditions is shown
in Figure 26.
2.7 nH
50
Ω
0.17 in.
RF
Output
RF
Input
MGA-
83563
Figure 26. Final Large Signal RF Input
Match for the 2.5 GHz Amplifier.
The addition of the 2.7 nH series
inductor increased the large
signal input return loss from
7.6 dB (with no matching) to
14.8 dB (1.4:1 VSWR) at 2.5 GHz.
Completed 2.5 GHz
Amplifier
A schematic diagram of the final
2.5 GHz circuit is shown in
Figure 27. All unmarked capaci-
tors are 62 pF.
Vd
RF
Output
RF
Input
L1 = 2.7 nH
L2 = 1.5 nH
RFC =
22 nH
50
Ω
0.17 in
3
6
1
50
Ω
0.08 in
C2 = 0.9 pF
Figure 27. Schematic Diagram of
2.5 GHz Amplifier.
The completed 2.5 GHz amplifier
assembly with all components is
shown in Figure 28.
Input
Output
L2
+3V
L1
RFC
C
C
C
C2
Figure 28. Completed 2.5 GHz
Amplifier Assembly.
The small signal gain of the
completed amplifier was mea-
sured as 22.0 dB at 2.5 GHz. Gain
over a frequency range of 2.0 to
3.0 GHz is shown in Figure 29.
14
18
22
28
26
24
20
16
2
2.2
2.4
2.6
3
2.8
FREQUENCY (GHz)
Figure 29. Small Signal Gain of the
Completed 2.5 GHz Amplifier.
The (small signal) input and
output return losses for the
completed amplifier are 14.9 dB
and 5.5 dB respectively at
2.5 GHz. Input and output return
loss over the 2.0 to 3.0 GHz
frequency range is shown in
Figure 30.
-25
-15
0
-5
-10
-20
2
2.2
2.4
2.6
3
2.8
FREQUENCY (GHz)
Figure 30. Input and Output
Return Loss of the Completed
2.5 GHz Amplifier.
INPUT
OUTPUT
Table 2 summarizes measured
results for this particular ampli-
fier at 2.5 GHz.
Output
Mode
Gain
Power
Id
(dB) (dBm) (mA)
Small Signal
22.0
—
148
G-1dB
21.0
19.2
165
Saturated
17.8
21.8
139
Table 2. Performance Summary for
2.5 GHz Amplifier.



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