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MGA-52543

Low Noise Amplifier

HP => Agilent Technologies 

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 50Ω) to the optimum

source impedance for minimum

noise, Γopt. Since the real part of

the input of the device impedance

is near 50Ω 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.

L2

C1

42

RFC

L1

C2

+5V

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.

20

16

12

8

NF

Gain

P1dB

4

0

1

2

3

4

5

SUPPLY VOLTAGE (V)

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.

9

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