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Visit www.macomtech.com for additional data sheets and product information.

M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make

changes to the product(s) or information contained herein without notice.

9

3W Power Amplifier Module

4.0-5.9 GHz

XP1044-QL

ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions

is considering for development. Performance is based on target specifications, simulated results,

and/or prototype measurements. Commitment to develop is not guaranteed.

PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology

Solutions has under development. Performance is based on engineering tests. Specifications are

typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.

Commitment to produce in volume is not guaranteed.

Rev. V2

App Note [1] Biasing - The XP1044-QL requires power supply sequencing. Negative voltage supply (VG)

needs to be turned on first and then positive voltage can be applied to the drain (VD). When turning off the de-

vice, the positive supply (VD) should be turned off first and then negative voltage (VG) can be removed.

The gate voltage is adjusted in order to set the drain current to the desired level. The gate voltage required to

achieve a certain current can vary over temperature and from one device to another due to pinch-off voltage

variation. Constant drain current can be achieved by implementing an active bias circuit which allows for tem-

perature compensation and eliminates the effect of pinch off voltage variation.

The input stage transistor periphery is half of the output stage transistor periphery and therefore the gate volt-

ages needed to set the first stage current to 300mA and the second stage current to 600mA are the same. The

gate voltages can be connected together and a single active bias circuit can be implemented adding a total of 6

components at a cost of approximately $0.15.

Typical Application

XB1014-QT

XP1080-QU

TX Filter

(if required)

X2

DET

TX

XU1019-QH

DRIVER

PA + DET

DIPLEXER

IF IN

LO