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MGA-53543 Datasheet(Fiches technique) 6 Page - Agilent(Hewlett-Packard)

Numéro de pièce MGA-53543
Description  50 MHz to 6 GHz High Linear Amplifier
Télécharger  14 Pages
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Fabricant  HP [Agilent(Hewlett-Packard)]
Site Internet  http://www.home.agilent.com
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6
MGA-53543 Applications Information
Description
The MGA-53543 is a highly linear
enhancement mode PHEMT
(Pseudomorphic High Electron
Mobility Transistor) amplifier
with a frequency range extending
from 450 MHz to 6 GHz. This
range makes the MGA-53543
ideal for both Cellular and PCS
basestation applications. With
high IP3 and low noise figure, the
MGA-53543 may be utilized as a
driver amplifier in a transmit
chain or as a first or second stage
LNA in a receive chain or any
other application requiring high
linearity.
The MGA-53543 operates from a
+5 volt power supply and draws a
nominal current of 53.8 mA. The
RFIC is contained in a miniature
SOT-343 (SC-70 4-lead) package
to minimize printed circuit board
space. This package also offers
good thermal dissipation and RF
characteristics.
Application Guidelines
For most applications, all that is
required to operate the MGA is to
apply a DC bias of +5 volts and
match the RF input and output.
RF Input
The first step to achieve maxi-
mum linearity is to match the
input of MGA-53543 to one of the
linearity values listed on the data
sheet. For example, at 1900 MHz
the MGA-53543 needs to see a
complex impedance of 0.38
∠156° looking towards the
source and an output impedance
of 0.05
∠45° looking towards the
load. This may be accomplished
by a conjugate match from the
system input impedance (typi-
cally 50
Ω) to Γ
S
*. Figure 1 shows
the location of these input and
output Gammas (
Γ
S and ΓL)
required for a high linearity.
ΓL
ΓS
Figure 1. Matching for linearity at 1900 MHz.
RF Output
Few matching elements are
required on the output of the
MGA-53543 to achieve good
linearity because the output
Gamma (
Γ
L
) is close to 50
Ω.
DC Bias
To bias the MGA-53543, a +5 volt
supply is connected to the output
pin through an inductor, RFC,
which isolates the inband signal
from the DC supply as shown in
Figure 2. Capacitor C3 serves as
an RF bypass for inband signals
while C4 helps eliminate out of
band low frequency signals. An
optional resistor R1 may be
added to de-Q any resonance
created between C3 and C4.
Typically values range from 2.2
to 10
Ω. A DC blocking capacitor,
C2, is used at the output of the
MMIC to isolate the supply
voltage from succeeding circuits.
RFC
+5V
L1
C1
R1
RFin
1
34
2
C3
C4
53
C2
RFout
Figure 2. Schematic diagram with bias
connections.
Operating at Other Voltages
Operating this RFIC at voltages
less than 5V will affect NF, Gain,
P1dB and IP3. Figure 3 below
demonstrates the affects of
changing supply voltage at
1900 MHz.
SUPPLY VOLTAGE (V)
1
20
15
10
5
0
5
24
3
NF
Gain
P1dB
Figure 3. Gain, NF and P1dB vs. supply voltage
at 1900 MHz.
The affects of supply voltage on
OIP3 and current at 1900 MHz
are shown in Table 1. The
MGA-53543 is internally biased
for optimal performance at a
quiescent current of 53.8 mA.
Voltage
OIP3
Id
(V)
(dBm)
(mA)
1V
0
4
2V
17
16
3V
28
24
4V
35
41
5V
39
51
Table 1. OIP3 vs. supply power.
Matching
The most important criterion
when designing with the
MGA-53543 is choosing the input
and output-matching network.
The MGA-53543 is designed to
give excellent IP3 performance,
however to achieve this requires
both the input and output
matching network to present




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