MGA-83563-BLKG Avago Technologies US Inc., MGA-83563-BLKG Datasheet - Page 7

• Manufacturer Part Number: MGA-83563-BLKG
• Description: IC RF AMP GAAS 3V 22DBM
• Manufacturer: Avago Technologies US Inc.
• Type: Power Amplifierr

Specifications of MGA-83563-BLKG

• P1db: 19.7dBm
• Package / Case: SC-70-6, SC-88, SOT-363
• Current - Supply: 152mA ~ 200mA
• Frequency: 500MHz ~ 6GHz
• Gain: 23dB
• Test Frequency: 2GHz
• Voltage - Supply: 2.7V ~ 3.6V
• Mounting Style: SMD/SMT
• Technology: Power Amplifier
• Number Of Channels: 1
• Operating Frequency: 6000 MHz
• Operating Supply Voltage: 3 V
• Supply Current: 200 mA @ 3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Rf Type: -
• Noise Figure: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 516-1956; MGA-83563-BLKG

7
MGA-83563 Applications Information
The MGA-83563 is two-stage, medium power GaAs RFIC
amplifier designed to be used for driver and output
stages in transmitter applications operating within the
500 MHz to 6 GHz frequency range.
This device is designed for operation in the saturated
mode where it delivers a typical output power of +22
dBm (158 mW) with a power-added efficiency of 37%. The
MGA-83563 has a large signal gain of 18 dB requiring an
input signal level of only +4 dBm to drive it well into satu-
ration. The high output power and high efficiency of the
MGA-83563, combined with +3-volt operation and sub-
miniature packaging, make this device especially useful for
battery-powered, personal communication applications
such as wireless data, cellular phones, and PCS.
The upper end of the frequency range of the MGA-83563
extends to 6 GHz making it a useful solution for medium
power amplifiers in wireless communications products
such as 5.7 GHz spread spectrum or other ISM/license-
free band applications. Internal capacitors on the RFIC
chip limit the low-end frequency response to applica-
tions above approximately 500 MHz.
The thermal limitations of the subminiature SOT-363
(SC-70) package generally restrict the use of the MGA-
83563 to applications that use constant envelope types
of modulation. These types of systems are able to take
full advantage of the MGA-83563’s high efficiency, satu-
rated mode of operation. The use of the MGA-83563 for
linear applications at reduced power levels is discussed
in the “Thermal Design for Reliability” and “Use of the
MGA-83563 for Linear Applications” in this applications
note.
Application Guidelines
The use of the MGA-83563 is very straightforward. The
on-chip, partial RF impedance matching and integrated
bias control circuit simplify the task of using this device.
The design steps consist of (1) selecting an interstage in-
ductor from the data provided, (2) adding provision for
bringing in the DC bias, and (3) designing and optimizing
an output impedance match for the particular frequency
band of interest. The input is already well matched to 50
ohms for most frequencies and in many cases no addi-
tional input matching will be necessary.
Each of the three design steps for using the MGA-83563
will now be discussed in greater detail.
Step 1 — Selecting the Interstage Inductor
The drain of the first stage FET of this two-stage RFIC am-
plifier is connected to package Pin 1. The supply voltage
V
shown in Figure 18. The supply end of the inductor is by-
passed to ground.
This interstage inductor serves the purpose of complet-
ing the impedance match between the first and second
stages. The value of inductor L2 depends on the particu-
lar frequency for which the MGA-83563 is to be used and
is chosen from the look-up graph in Figure 19.
Input
Figure 18. Interstage Inductor L2 and Bias Current.
The values for inductor L2 are somewhat dependent on
the specific printed circuit board material, thickness, and
RF layout that are used. The inductor values shown in
Figure 19 have been created for the PCB and RF layout
that is used for the circuit examples presented in this ap-
plication note. The methodology that was used to deter-
mine the optimum values for L2 and for creating Figure
19 is presented in the Appendix. If the user’s PCB and/or
layout differ significantly from the example circuits, refer
to the Appendix for a description of how to determine
the values of L2 for any arbitrary frequency, PCB material,
or RF layout.
Step 2 — Bias Connections
The MGA-83563 is a voltage-biased device and operates
from a single, positive power supply. The supply voltage,
typically +3-volts, must be applied to the drains of both
stages of the RFIC amplifier. The connection to the first
stage drain is made through the interstage inductor, L2,
as described in the previous step. The supply voltage is
applied to the second stage drain through Pin 6, which
is also the RF Output connection. Referring to Figure 18,
an inductor (RFC) is used to separate the RF output signal
from the DC supply. The supply side of the RFC is capaci-
tively bypassed. A DC blocking capacitor is used at the
output to isolate the supply voltage from the succeeding
stage.
RF
d
is connected to this drain through an inductor, L2, as
3
L2
1
6
RFC
V
Input
RF
d