MGA83563BLK datasheet(7/24 Pages) HP

Part #	MGA83563BLK

Description	22 dBm PSAT 3V Power Amplifier for 0.5-6 GHz Applications

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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 saturation. The

high output power and high

efficiency of the MGA-83563,

combined with +3-volt operation

and subminiature 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 communi-

cations 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 applications 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, saturated 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 Applica-

tions” 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 inductor

from the data provided, (2)

adding provision for bringing in

the DC bias, and (3) designing

and optimizing an output imped-

ance 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 additional 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 amplifier is

connected to package Pin 1. The

supply voltage Vd is connected to

this drain through an inductor,

L2, as shown in Figure 18. The

supply end of the inductor is

bypassed to ground.

This interstage inductor serves

the purpose of completing the

impedance match between the

first and second stages. The value

of inductor L2 depends on the

particular frequency for which

the MGA-83563 is to be used and

is chosen from the look-up graph

in Figure 19.

RF

Input

RF

Input

RFC

Vd

3

L2

1

6

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

application note. The methodol-

ogy that was used to determine

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

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MGA83563BLK Datasheet(PDF) 7 Page - Agilent(Hewlett-Packard)

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