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MGA-52543-TR2G Datasheet(PDF) 9 Page - Agilent(Hewlett-Packard)

Part # MGA-52543-TR2G
Description  Low Noise Amplifier
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Manufacturer  HP [Agilent(Hewlett-Packard)]
Direct Link  http://www.home.agilent.com
Logo HP - Agilent(Hewlett-Packard)

MGA-52543-TR2G Datasheet(HTML) 9 Page - Agilent(Hewlett-Packard)

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9
MGA-52543 Applications
Information
Description
The MGA-52543 is a low noise,
linear RFIC amplifier GaAs
PHEMT (Pseudomorphic High
Electron Mobility Transistor)
designed for receiver applications
in the 300 MHz to 6.0 GHz
frequency range. The device
combines low noise performance
with high linearity to make it a
desirable choice for receiver front
end stages as well as driver
applications.
The MGA-52543 operates from a
+5 volt power supply and draws a
nominal current of 55 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
excellent thermal dissipation and
RF characteristics. The device is
focused at cellular/PCS
basestation applications.
The high frequency response of
the MGA-52543 extends through
6 GHz making it an excellent
choice for use in 5 GHz RLL as
well as 2.4 and 5.7 GHz spread
spectrum and ISM/license-free
band applications.
Internal, on-chip capacitors limit
the low end frequency response to
applications above approximately
300 MHz.
Application Guidelines
The MGA-52543 is very easy to
use. For most applications, all that
is required to operate the MGA-
52543 is to apply +5 volts to the
RF output pin, and match the RF
input and output.
RF Input
To achieve lowest noise figure
performance, the input of the
MGA-52543 should be matched
from the system impedance
(typically 50
Ω) to the optimum
source impedance for minimum
noise,
Γ
opt. Since the real part of
the input of the device impedance
is near 50
Ω and the reactive part
is capacitive, a simple series
inductor at the input is often all
that is needed to provide a
suitable noise match for many
applications.
RF Output
The RF Output port is closely
matched to 50
Ω, a simple series
inductor at the output will help to
improve the input match, gain and
power response of the device.
DC Bias
DC bias is applied to the MGA-
52543 through the RF Output
connection. Figure 1 shows how
an inductor (RFC) is used to
isolate the RF signal from the DC
supply. The bias line is capaci-
tively bypassed to keep RF from
the DC supply lines and prevent
resonant dips or peaks in the
response of the amplifier.
The DC schematic for an MGA-
52543 amplifier circuit is shown in
Figure 1.
RFC
+5V
L2
L1
C1
C2
42
Figure 1. Schematic Diagram with Bias
Connections.
A DC blocking capacitor (C1) is
used at the output of the MMIC to
isolate the supply voltage from
succeeding circuits.
While the RF input terminal of the
MGA-52543 is at DC ground
potential, it should not be used as
a current sink. If the input is
connected directly to a preceding
stage that has a DC voltage
present, a blocking capacitor
should be used.
Setting the Bias Voltage for Linearity
The MGA-52543 will operate from
approximately 2 volts with
reduced performance. The MGA-
52543 typically pulls 53 mA at 5V.
The higher voltage increases
amplifier linearity by boosting
output power (P1dB) typically from
14 dBm at 3V to 18 dBm at 5V. An
absolute maximum recommended
supply voltage for this device is
5.5V. Optimum linearity perfor-
mance is obtained at 5V supply.
Typical performance of gain, noise
figure and P1dB output power over
a wide range of bias voltage is
shown in Figure 2.
SUPPLY VOLTAGE (V)
1
20
16
12
8
4
0
5
24
3
NF
Gain
P1dB
Figure 2. Gain, Noise Figure and Output Power
vs. Supply Voltage.
Input and output impedance and
noise figure for the amplifier are
unaffected by increasing the
supply voltage from 3V to 5V.
PCB Layout
A recommended PCB pad layout
for the miniature SOT-343 (SC-70)
package that is used by the MGA-
52543 is shown in Figure 3.


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