RF modules for cellular/PCS handsets
Keywords:cdma? anadigics? silicon transistor? handset trend? radio architecture?
/ARTICLES/1999SEP/1999SEP09_ICD_BD_TAC.PDF |
Wireless Technologies China `99 ? Conference Proceedings 169
Introduction
Similar to the explosive in the Internet services, demand for
Cellilat and PCS services has been growing by leaps and bumps.
As a result, from 1997 to 1998 worldwide handset production
increased from 110 millions to 160 millions and the forecast
for 1999 is close to 200 millionds.At that rate, handset produc-
tion will out-run PC production by a factor of almost 2 to 1 this
year.
There are serveral driving forces:
? Cost of service is getting cheaper every year
? Quality of service is better with new digital GSM, CDMA
and TDMA air interface standards than the older analog
standards
? Handsets are getting smaller, lighter and more feature rich
every six months
A state-of-art handset measures less than 3-4 inch long and
weights less than 4-5 ounces and provides the following features:
? Dual or triple frequency bands
? 4.5 hours talk time
? 200 hours standby time
? Phone book with more
than 250 names
? Conference calls
? Call hold/Call wait
? Alternative line service
? Automatic world clock
? Two games, Tetris and
Solitaire
? Easy access to the 20
latest numbers dialed, calls
received or missed
? Advice of charging
? Fixed dialing numbers
? Call baring
? Calling line identification
? SIM application tool kit
The competetive bat is
raised every time a major
handset supplier introduces a
new model.
To meet the challenges, handset manufacturers
demand more and more from their component supplier. For ra-
dios, the Holy Grail si "Radio on a Single Silicon Chip".
As much as it's desired, "Radio on a Single Silicon
Chip"is not technically feasible because
? 110 DB selectivity requires passive filters such as SAW or
dieletctric filters
? Long talk time requires GaAs power amplifiers and switches
As a result, multi-chip modules (MCMs) which integrate
differebt type of chips inside a single mechnaical housing
become an attractive alternative.
RF modules for handsets
In figure 1, a CDMA PA module is presented. The module in-
corporates GaAs IC, silicon transistor, chip resistors and ca-
pacitors. It delivers 29 dBm output power at PCS frequencies.
In figure 2, a SAW receiver module is presented. The module
incorporates GaAs ICs and surface acoustic wave (SAW) fil-
ters and deliver superior performance for handset receivers.
Figure 1: A CDMA PA Module
RF Modules for
Cellular/PCS
Handsets
Dr. Charles Huang
ANADIGICS, Inc.
Wireless Technologies China `99 ? Conference Proceedings170
Figure2: A SAW Receiver Module
Summary
RF module deliver optimal solutions for state of the art hand-
sets.
Presentation Materials
Wireless Technologies China `99 ? Conference Proceedings 171
Wireless Technologies China `99 ? Conference Proceedings172
Wireless Technologies China `99 ? Conference Proceedings 173
Wireless Technologies China `99 ? Conference Proceedings174
Wireless Technologies China `99 ? Conference Proceedings 175
Wireless Technologies China `99 ? Conference Proceedings176
Wireless Technologies China `99 ? Conference Proceedings 177
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