Anritsu HFE0903 Cree

70 High Frequency Electronics

High Frequency Products

LINEAR PA MODULE

30-Watt Module
Covers the 1930-1990
PCS Wireless Band

C

ree Microwave has
introduced a new

amplifier module
for linear PCS systems.
The PFM19030SM com­bines a 5 watt LDMOS
driver and a 30 watt
LDMOS PA with internal

interstage matching. The input and output are
partially matched, with recommended source
and load impedances of 19 +j1.9 and 21 +j6.3
respectively.

Internal Thermal Sensing

Each silicon LDMOS device in the
PFM19030SM has an internal sense FET for
improved bias control. These FETs are fabri­cated from the same epi material as the power
devices, with identical physical characteris­tics. If desired by the designer, these devices
may be used to drive external bias circuitry to
maintain optimum performance over a wide
range of operating temperatures.

The module is constructed on a high con­ductivity copper base, 40 mils thick, that is
thermally matched to typical PCB material.
The base serves as a heat spreader in surface
mount installations; data sheet thermal speci­fications were obtained with the module sol­dered to a 20 mil thick PCB with an array
plated-through holes for electrical grounding
and heat sinking.

At 1 dB gain compression, the power out­put is nominally 45 dBm, with approximately

0.5 dB variation with a 2 volt change in V

dc

.
With this 30 watts peak power capability, the
amplifier module provides 5 watts average
power output in IS95 CDMA service. Small
signal gain is 28 dB minimum, power-added
efficiency is 20% and ACPR is –49 dBc, as
shown in the accompanying graph.

Cree Microwave
Tel: [phone]
www.creemicrowave.com

HFeLink 302

This device is an easy-to-

implement module for IS95

CDMA, WCDMA, and EDGE

applications, combining

two stages of amplification

with interstage matching

Cree Microwave offers the PFM19030SM sur­face mount LDMOS module for PCS base
station designs.

IS95 CDMA ACPR and efficiency data for the
PFM19030 amplifier module.

From September 2003 High Frequency Electronics

Copyright © 2003 Summit Technical Media, LLC