AnyDATA EMII-800 User manual

Interface DescriptionEMII-800 Service Manual ApplicationInformation
EMII-800 V1.0AnyDATA.NET Proprietary Use Subject to Restrictions
800MCDMA Wireless Kit
EMII-800
AnyDATA.NET Inc.
HanvitBank B/D 6F
Byulyang-dongKwachon
KOREA
Tel) 82-2-504-3360
Fax) 82-2-504-3362
SERVICE MANUAL

Interface DescriptionEMII-800 Service Manual ApplicationInformation
EMII-800 V1.0AnyDATA.NET Proprietary Use Subject to Restrictions
Introduction
The EMII-800 is designedfor the test and simulation oftheCDMA wireless data communications. User can
connect the EMII-800 to yourPCorNotebook and easilytest the wireless communications. Usercan use this to
developyourapplicationssoftware evenbeforeuser sownhardware is ready.It also canbe usedas a
debugging duringuser s hardware test.
DisclaimerandLimitation of Liability
AnyDATA.NETInc. assumes no responsibilityforany damageorloss resultingfromthe misuse ofits products.
AnyDATA.NETInc. assumes noresponsibilityforany loss orclaimsbythirdparties, which mayarise through
the use ofits products. AnyDATA.NETInc. assumes no responsibilityforanydamageorloss caused bythe
deletion or loss of data as a result ofmalfunctions or repairs.
The informationdisclosed herein is the exclusive propertyofAnyDATA.NET Inc. and nopart ofthis publication
maybe reproduced ortransmitted inany formor byany means includingelectronic storage, reproduction,
adaptation , translation , execution or transmissionwithout the prior writtenconsent ofAnyDATA.NETInc.
The informationcontained inthis document is subject to change without notice.
FCC RF ExposureInformation
Warning! Read this information before usingthis device.
InAugust 1996theFederal Communications Commission(FCC) ofthe United States withits
actionin Reportand Order FCC96-326adopted anupdatedsafetystandard forhuman
exposureto radio frequencyelectromagnetic energyemittedbyFCCregulated transmitters.
Those guidelines are consistent with the safetystandard previouslyset byboth U.S. and
international standards bodies. Thedesignofthis device complies with theFCCguidelines and
these international standards.

Interface DescriptionEMII-800 Service Manual ApplicationInformation
EMII-800 V1.0AnyDATA.NET Proprietary Use Subject to Restrictions
CAUTION
n Operating Requirements
The user cannot make anychanges or modifications notexpresslyapproved bythe partyresponsible for
compliance, otherwise it could void the user's authorityto operate the equipment.
Tosatisfy FCC RF exposure compliance requirements foramobile transmittingdevice, this device and
its antenna shouldgenerallymaintaina separationdistance of20cmor more froma person s body.
Specialaccessories
Inorder toensurethis device in compliance with FCCregulation,the special accessories are providedwith this
device and must beused with the device only. Theuser is notallowedtouse any otheraccessories than the
special accessories given with this device

Interface DescriptionEMII-800 Service Manual ApplicationInformation
EMII-800 V1.0AnyDATA.NET Proprietary Use Subject to Restrictions
Table of Contents
GeneralIntroduction
........................................................................................................................... 2
CHAPTER 1.System Introduction
1. System Introduction ................................................................................................ 3
2. Features and Advantages of CDMA Module ......................................................... 4
3. Structure and Functions of CDMA Module .......................................................... 7
4. Specification ........................................................................................................... 8
CHAPTER 2.NAM Input Method(Inputtingof telephonenumbers included)
1. NAM ProgrammingMethod and Telephone Number Input Method ....................... 11
CHAPTER 3.Circuit Description
1. Overview................................................................................................................ 14
2. RF Transmit/ReceivePart ..................................................................................... 14
3. Digital/VoiceProcessingPart ...................................................................... ®®.. 17
4. LevelTranslator Part
®®®®®®®®®®®®®®®®®®®®®®®®®.24
CHAPTER 4.FCC Notice
Appendix
......................................................................................................................... 22
1. Assemblyand DisassemblyDiagram
2. Block & CircuitDiagram
3. PartList
4. Component Layout

Interface DescriptionEMII-800 Service Manual ApplicationInformation
EMII-800 V1.0AnyDATA.NET Proprietary Use Subject to Restrictions
The EMII-800 functions digitalcellularmoduleworkedin CDMA (Code DivisionMultiple Access)
mode.CDMA type digitalmodeapplies DSSS (Direct SequenceSpread Spectrum) modewhichis
usedin military.
Thisfeatureenables the phone to keepcommunication from being crossed anduseone frequency
channelbymultiple usersin the samespecificarea,resulting that itincreasesthe capacity10times
morecompared with that in the analog modecurrentlyused.
Soft/SofterHandoff, Hard Handoff, andDynamic RF power Controltechnologiesare combinedinto
this phone to reducethe callbeinginterruptedin a middleof talking overphone.
CDMA digital cellularnetworkconsistsof MSC (MobileSwitchingOffice), BSC (BaseStation
Controller), BTS (Base station Transmission System), andMS (Mobile Station). Communication
betweenMS andBTS is designed tomeet thespecification of IS-95A (CommonAir Interface). MS
meets the specifications of thebelow :
-IS-95A/B/C ( Common Air Interface ) : Protocol betweenMS and BTS
-IS-96A ( Vocoder ) : Voice signal coding
-IS-98:BasicMS functions
-IS-126 : Voice loopback
-IS-99:Short Message Service, Async Data Service, and G3 FaxService
EMII-800 is digital modeis designedtobeoperatedinfull duplex.
General Introduction

EMII-800
1.SystemIntroduction
1.1 CDMAAbstract
Thecellular systemhas achannel hand-offfunctionthat is usedforcollectingtheinformationon the locations and movements
ofradio mobile telephones fromthe cell site byautomaticallycontrollingseveral cell site through the setup ofdata transmission
routes and thus, enabling oneswitchingsystemtocarryout the automatic remote adjustment. This is tomaintaincontinuously
thecall state throughtheautomatic location confirmationand automatic radiochannel conversion whenthe busysubscriber
moves fromtheservice area ofone cell site tothat of another byusingautomatic location confirmationand automatic radio
channel conversionfunctions. Thecall state can be maintainedcontinuouslybythe information exchangebetween switching
systems when the busysubscriber moves fromone cellular systemarea tothe othercellularsystem area.
In thecellular system,thecell site is asmall-sized lowoutput type and utilizes afrequencyallocationsystemthat considers
mutual interference, in aneffort toenable the re-use ofcorrespondingfrequencyfromacell site separatedmore than acertain
distance. The analog cellularsystemsare classified further into an AMPS system,E-AMPS System,NMTsystem,ETACS
system, andJTACS systemdepending on technologies used.
Unlike the timedivision multiple access (TDMA)or frequencydivision multiple access (FDMA)usedin the band limited
environment, the Code DivisionMultiple Access(CDMA)systemwhichis one of digital cellular systemsis amulti-access
technology under the interference limitedenvironment. It can process morenumberofsubscribers comparedto other systems
(TDMA system has theprocessingcapacitythree times greater than theexistingFDMAsystemwhereas CDMAsystem,about
12~15 times ofthat of the existing system).
CDMAsystemcanbe explained as follows: TDMA or SDMA canbe used toenable eachperson to talk alternatelyor provide a
separate roomforeachperson when twopersons desire to talkwitheach other at thesame time, whereas FDMAcan be used to
enable one person totalkin soprano, whereas the other in bass (oneofthetwotalkers can carryout synchronizationforhearing
incase there is a bandpass filterfunction in the area ofthe hearer).
Anothermethodavailable is to maketwopersons tosingindifferent languages at thesame time, space, andfrequencywhen
wishing to let the audience hear the singing without beingconfused. This is the characteristics of CDMA.
On the other hand, when employingtheCDMA technology,each signal has a different pseudo-randombinarysequence used to
spreadthespectrumofcarrier. Agreat number ofCDMAsignals sharethe same frequencyspectrum.In the perspectiveof
frequencyarea ortimearea, several CDMAsignals are overlapped. Amongthese types ofsignals, onlydesired signal energy is
selectedand receivedthroughtheuse ofpre-determined binarysequence; desiredsignals can beseparatedandthen, received
withthecorrelatorused for recoveringthe spectruminto its original state. Atthis time, the spectrumsofother signals that have
differentcodes are notrecoveredinto its original state and instead,processed as noise and appears as theself-interference of
the system.
CHAPTER 1. SystemIntroduction

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2.FeaturesandAdvantagesof CDMA Module
2.1 Various Types of Diversities
Inthe CDMAbroadbandmodulation(1.25MHz band), three types of diversities (time, frequency,and space) areused to reduce
serious fading problems generatedfrom radio channels inorderto obtain high-qualitycalls.
Timediversitycanbe obtainedthroughtheuse of codeinterleaving anderrorcorrection code whereas frequencydiversitycan
beobtained byspreadingsignal energytomore wider frequencyband. The fadingrelated tonormal frequencycan affect the
normal 200~300kHz among signal bands and accordingly,serious affect canbe avoided. Moreover,space diversity(also called
pathdiversity) can be realizedwith the followingthree types of methods.
First, it canbe obtained bythe duplication ofcell site receive antenna. Second, it can beobtainedthroughthe use of
multi-signal processing device that receives atransmit signal havingeach different transmission delaytime andthen, combines
them.Third, it can beobtained throughthe multiple cell site connection(SoftHandoff)that connects the mobile station and
more thantwo cell sites at the same time.
2.2 Power Control
TheCDMA system utilizes theforward(from abase station to mobile stations) andbackward(fromthe mobile stationtothe
base station) power control in order toincrease the call processing capacityandobtain high-qualitycalls. Incase theoriginating
signals of mobile stations arereceived bythe cell site intheminimumcall qualitylevel (signal to interference) through theuse
oftransmit powercontrol onall the mobile stations, the system capacitycan be maximized.
If thesignal ofmobile stationis received too strong, the performance of that mobile stationis improved. However, because of
this, the interference onother mobile stations usingthe samechannel is increased and accordingly,the call qualityofother
subscribers is reducedunless the maximumaccommodation capacityis reduced.
In the CDMA system,forward power control, backwardopenlooppower control, and closed looppowercontrol methodsare
used.The forwardpower control is carriedoutinthecell site to reduce thetransmit power on mobile stations less affected by
themulti-pathfadingandshadowphenomenonandthe interference of other cell sites when themobile stationis notengaged in
thecall oris relativelynearerto the correspondingcell site. This is also used toprovide additional power to mobile stations
having high call error rates, located inbadreception areas or far awayfromthe cell site.
Thebackwardopen looppower control is carried outinacorrespondingmobile station;themobile stationmeasures power
received from the cell site and then,reverselyincreases/decreases transmit power in order to compensate channel changes
caused bythe forward link path loss andterraincharacteristics inrelationto the mobile station inthe cell site. Bydoingso,all
the mobile office transmit signals in the cells are received bythe cell site in the same strength.
Moreover, the backwardclosedlooppower control used bythe mobile stationto controlpower withthe commandsissuedout
bythecell site. The cell site receives the signal of eachcorrespondingmobile stationand compares this with the pre-set
threshold valueand then,issues out power increase/decrease commandsto the correspondingmobile station every1.25msec
(800times per second).
Bydoing so, the gain tolerance andthe different radio propagationloss on the forward/backwardlink are complemented.

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2.3 VoiceEncoder andVariable Data Speed
Thebi-directional voice service havingvariable data speed provides voice communication whichemploysvoice encoder
algorithmhavingpower variable data rate betweenthemobile telephone cell site and mobile station. Onthe otherhand, the
transmit voice encoderperformsvoice samplingandthen,creates encodedvoice packets tobesent out tothereceive voice
encoder, whereas the receive voice encoder demodulates the received voice packets into voice samples.
One of the twovoice encodersdescribedin the above is selected for use dependingon inputtedautomatic conditionsand
message/data; both ofthemutilize four-stage frames of9600, 4800, 2400, and 1200 bits persecond. Inaddition,this type of
variable voice encoderutilizes adaptivethreshold values whenselectingrequired data rate. It is adjusted inaccordance withthe
size ofbackground noise andthe data rate is increasedto highrate onlywhen the voice ofcalleris inputted.
Therefore, background noise is suppressed andhigh-qualityvoice transmissionis possible under the environment experiencing
serious noise. In addition, incase the caller does nottalk,data transmissionrate is reducedsothat thetransmissionis carried
outin lowenergy.This will reduce theinterference onother CDMAsignals and as aresult, improvesystemperformance
(capacity, increased byabout two times).
2.4 Protecting Call Confidentiality
CDMAsignals havethe function ofeffectivelyprotectingcall confidentialitybyspreadingand interleavingcall informationin
broadbandwidth.This makes the unauthorized use ofcrosstalk, search receiver, and radioveryhard substantially.Also
includedis the encryptionfunction on various authentication andcalls specified in IS-95forthe double protectionofcall
confidentiality.
2.5 Soft Handoff
Duringthe softhand,thecell site alreadyin the busystate and thecell site tobeengagedinthecall later participate inthe call
conversion.The call conversionis carried out throughthe original call connectioncell site, bothcell sites, and then, newcell
site. This methodcanminimize call disconnectionandprevent the userfromdetectingthe hand-off.
2.6 Frequency Re-UseandSectorSegmentation
Unlike the existinganalog cellularsystem, the CDMAsystemcan reuse the samefrequencyat theadjacentcell andaccordingly,
there is noneed toprepare aseparate frequencyplan.Total interference generatedonmobile stationsignals receivedfrom the
cell site is the sum ofinterference generated fromother mobile stationsinthesame cell site and interference generated fromthe
mobile station ofadjacentcell site. That is, each mobile stationsignal generates interference inrelation to the signals ofall the
othermobile signals.
Total interference fromall the adjacent cell sites is the ratioofinterference fromall the cell sites versus total interference from
othermobile stationsin the samecell site (about 65%). Inthecase of directional cell site, onecell normallyuses a120 sector
antenna inorder to divide the sector into three. Inthis case, each antennais usedonlyfor1/3 of mobile stations in thecell site

Interface DescriptionEMII-800Service Manual Application Information
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andaccordingly,interference is reducedby1/3 on theaverage andthecapacitythat can be supportedbythe entiresystemis
increased bythree times.
2.7 Soft Capacity
The subscriber capacityofCDMAsystemis flexible dependingon therelation between the number of users andservice classes.
For example, the system operatorcanincrease the number of channels available foruse during the busyhour despite the dropin
call quality.This type of function requires 40% of normal call channels inthe standbymode duringthehandoff support, inan
effort toavoid call disconnectionresultingfrom the lack ofchannels.
In addition,in the CDMAsystem,services and service charges are classified further into differentclasses so that more transmit
powercanbeallocated tohigh class service users foreasiercall set-up;theycanalso begivenhigher priorityof usinghand-off
function than the general users.

Interface DescriptionEMII-800Service Manual Application Information
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3.Structure and Functions of CDMA Module
Themobile station ofCDMA systemis made up of aradio frequencypart and logic/control(digital) part. The mobile station is
fullycompatible withthe existinganalog FM system.The mobile station antennais connectedwiththetransmitter/receivervia
a duplexer filter so that it can carryout the transmit/receive functionat the same time.
Thetransmit frequencyis the 25MHz bandof 824~849MHz, whereas the receivefrequencyis the 25MHz band of
869~894MHz. The transmit/receive frequencyis separated by45MHz. The RF signal fromtheantenna is converted into
intermediate frequency(IF)band bythefrequencysynthesizer and frequencydownconverterandthen,passes the bandpass
SAW filter havingthe 1.25MHz band.IF outputsignals that havebeenfiltered fromspurious signal are convertedinto digital
signals via an analog-to-digital converters(ADC) and then,sentoutrespectivelyto 5 correlators in each CDMA de-modulator.
Of these, one is called asearcher whereas the remaining 4 are calleddata receiver(finger). DigitalizedIFsignals include agreat
number ofcall signals that have been sent out bytheadjacentcells. These signals are detectedwith pseudo-noise sequence (PN
Sequence). Signal to interference ratio (C/I)onsignals that match thedesiredPN sequence are increasedthroughthis type of
correlationdetectionprocess. Then, othersignals obtainprocessing gainbynot increasingthe ratio.Thecarrierwave of pilot
channel fromthe cell site most adjacentlylocatedis demodulated inorder to obtainthesequence ofencodeddata symbols.
During the operationwith onecell site, the searchersearches outmulti-paths in accordance withterrain and buildingreflections.
On three data receivers, themost powerful four paths areallocatedfortheparallel tracingandreceiving. Fadingresistance can
be improved agreat deal byobtainingthe diversitycombinedoutput forde-modulation. Moreover, the searcher canbe used to
determinethe most powerfulpath fromthe cell sites even duringthesoft handoff duringthe two cell sites. Moreover, four data
receivers are allocated inorder to carryout the de-modulation ofthese paths. Data output that has been demodulatedchange the
data stringinthe combineddata rowas in the case of original signals(deinterleaving), andthen,are de-modulated bythe
forward error correction decoderwhichuses the Viterbi algorithm.
On the other hand, mobile stationuser informationsent out fromthe mobile station to thecell site pass through thedigital voice
encoder via a mike. Then,theyare encodedand forwarderrors are corrected throughthe use ofconvolution encoder.Then, the
order ofcode rowsis changedin accordance with acertainregulation inorder to removeanyerrors inthe interleaver. Symbols
madethroughtheabove process are spread afterbeingloaded onto PN carrierwaves. At this time, PN sequence is selected by
each address designated in each call.
Signals that have beencode spread as aboveare digital modulated(QPSK) and then,powercontrolledat the automatic gain
control amplifier (AGC Amp). Then, theyareconverted into RF band bythefrequencysynthesizer synchronizingthese signals
to properoutput frequencies.
Transmit signals obtainedpass throughthe duplexer filter andthen, are sent out to the cell site via the antenna.

Interface DescriptionEMII-800Service Manual Application Information
EMII-800V1.0 AnyDATA.NET Proprietary Use Subject to Restrictions
4.Specification
4.1 General Specification
4.1.1 Transmit/ReceiveFrequency Interval :45 MHz
4.1.2 NumberofChannels (ChannelBandwidth)
CDMA : 20 CH (BW:1.23MHz)
41.3 Operating Voltage: DC 6~12V
4.1.4 Operating Temperature : -30°~ +60°
4.1.5 FrequencyStability :CDMA : 300 Hz
4.1.6 Antenna : Whip Type, 50 Ω
4.1.7 Sizeand Weight
1)Size : 121mmx 57mm x 24mm(L xW xD) with case
2) Weight : 112g
4.1.8 ChannelSpacing: CDMA : 1.25MHz
4.2 Receive Specification
4.2.1 FrequencyRange
Digital :869.04 MHz ~ 893.97MHz
4.2.2 Local OscillatingFrequency Range : 966.88MHz 12.5MHz
4.2.3 IntermediateFrequency : 85.38MHz
4.2.4 Sensitivity : less than -104dBm
4.2.5 CDMA Input SignalRange
•Dynamicrange : -104~ -25 dBm ( more than 80dB) at the1.23MHz band.

Interface DescriptionEMII-800Service Manual Application Information
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4.3 Transmit Specification
4.3.1 FrequencyRange
824.04MHz ~ 848.97MHz
4.3.2 Local OscillatingFrequency Range : 966.88 MHz 12.5 MHz
4.3.3 IntermediateFrequency : 130.38 MHz
4.3.4 Output Power: 0.32W
4.3.5 Interference Rejection
1) Single Tone : -101dBmwith Jammer of -30dBmat 900 kHz
2) TwoTone :-101dBmwith Jammer of -43dBmat 900kHz & 1700kHz
4.3.7 CDMA TXFrequency Deviation : +300Hzor less
4.3.8 CDMA TXConducted Spurious Emissions
•
less than - 42 dBc/30kHz @ 900KHz
• less than - 54dBc/30kHz @1.98MHz
4.3.9CDMA MinimumTX PowerControl : less than - 50dBm

Interface DescriptionEMII-800Service Manual Application Information
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4.4 MS (Mobile Station) TransmitterFrequency
FA NO. CH.NO. CENTER FREQUENCY FA NO. CH.NO. CENTER FREQUENCY
1
2
3
4
5
6
7
8
9
10
1011
29
70
111
152
193
234
275
316
363
824.640MHz
825.870MHz
827.100MHz
828.330MHz
829.560MHz
830.790MHz
832.020MHz
833.250MHz
834.480MHz
835.890MHz
11
12
13
14
15
16
17
18
19
20
404
445
486
527
568
609
650
697
738
779
837.120 MHz
838.350 MHz
839.580 MHz
840.810 MHz
842.04MHz
843.270 MHz
844.500 MHz
845.910 MHz
847.140 MHz
848.370 MHz
4.5 MS (Mobile Station) Receiver Frequency
FA NO. CH.NO. CENTER FREQUENCY FA NO. CH.NO. CENTER FREQUENCY
1
2
3
4
5
6
7
8
9
10
1011
29
70
111
152
193
234
275
316
363
869.640MHz
870.870MHz
872.100MHz
873.330MHz
874.560MHz
875.790MHz
877.020MHz
878.250MHz
879.480MHz
880.890MHz
11
12
13
14
15
16
17
18
19
20
404
445
486
527
568
609
650
697
738
779
882.120 MHz
883.350 MHz
884.580 MHz
885.810 MHz
887.04MHz
888.270 MHz
889.500 MHz
890.910 MHz
892.140 MHz
893.370 MHz

Interface DescriptionEMII-800Service Manual Application Information
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1.INSTALLATIONMETHOD
IDLEBUSYSMS PWR
iPORT
AnyDATA
6~12V
Input UART1
EAR/MIC UART2 ANT
Connector
COM1
8 Pinto 9 Pin
Cable
Power
Supply
(6~12V)
+-
HeadSet
ANT
1) Supplythe voltageof 6~12V to 2pin Connector of the EMII-800.
2) Connect the UART1 to PCCOM1 port with theRS-232C cable.
3) Install the operatingprogram.
CHAPTER 2. NAM Input Method

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2. OPERATION METHOD
2) Set Buad rate to the modem s.
3) Click [DM mode]
1) Run PSTDM program at Windows95 or Windows98

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4) If OK is displayed in the message box,modem is now ready for
communication withPC.
5) Click MENUBAR icon.

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6) As shown inthepicture above, service file input plane will be displayed
(See ifclockis running. If it isn t, communication with PC is notactivated.
Repeat step 1 through 5, orresetthe power of modemand repeat step 1 through 5)
7) Type NAM Programmingscript like the example shownbelow,
<NAM Programmingscriptexample>
Mode offline-d [ENTER]
nv_write name_nam{0," AnyDATA telecom "}[ENTER]
nv_write name_nam{1," AnyDATA telecom "}[ENTER]
Mode reset [ENTER]
SCRIPTINPUT WINDOW

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1. Overview
IFR3000 receives modulated digitalsignals fromthe MSM ofthe digitalcircuit and then, changes theminto analog
signalsbythe digital/analogconverter(DAC, D/AConverter) inorder tocreate basebandsignals. Created
baseband signalsare changed intoIFsignals by RFT3100 and then, fed intotheMixer after going through AGC.
IF signals thathave been fedare mixed with the signals of VCO and changed intothe RF signals andthen,theyare
amplified atthe Power AMP. Finally,they are sentout tothecellsiteviathe antennaafter goingthrough the
isolator and duplexer.
2. RFTransmit / Receive Part
2.1 CDMATransmit End
8bit Iand Qtransmitsignals are inputted into2DACs (DIGITAL-TO-ANALOG CONVERTER) fromthe output
terminalTX_IQDATA0 ~TX_IQDATA7 ofMSM throughthe input terminals TXD0~TXD7 of BBA. Transmit
signalinput speed is two times of TXCLK+, TXCLK- which are two transmit/receive reference frequency.
Among transmit signals being inputted, signals are inputted into IsignalDAC when the transmitclockis inthe rise
edge, whereas signals are inputted into QSignalDAC duringthe dropedge. Iand Qtransmitsignalsare
compensated andoutputtedat MSM inorder to compensate the 1/2clocktimedifference generated between
reference clocks. Inthe signalscoming outfromtheoutput terminal of DAC, there are spurious frequency
ingredientsresultingfromDAC outputtransitionedge and parasite ingredients, transmitclockfrequencies and
harmonics which areunwanted signals. Accordingly,spuriousingredientsare removed bypassingthe signals
through LPF of passband 6.30KHz. Unlike the receive end, thetransmit end LPF requires no OFFSET adjustment.
Analogbaseband signals thathavepassed theCDMALPF are mixedwithIand Qsignals of frequency130.38
MHz (260.76MHz created inthe BBA internal VCOare divided byhalfintofrequency130.38MHz having the
phase difference of 90 degrees) in two mixers. The mixed signalsareadded againand converted intoIFfrequency
130.38 MHz 630 KHz (CDMA SpreadPower DensityModulated Signals)and then, outputted.
2.2. Tx IF/Baseband Processors, RFT3100 (U102)
TheRFT3100 connectsdiretlywith QUALCOMM s MSM5100 utilizingan analogbaseband
interface. The basebaand quadrature signals are upconverted to theCellular or PCS frequency
bands and amplified to provide signal drivecapabilityto thePA.The RFT3100 includes an IF
mixer for upconvertinganalogbaseband to IF, aprogrammable PLLfor generatingTx IF
frequency,singlesideband upconversion from IF to RF,twocellular and two PCS driver
amplifiers, and Tx power control throughan 85 dB VGA.As added benefit,thesinglesideband
upconversion eliminatesthe need for abandpass filter normallyrequired between the upconverter
CHAPTER 3. Circuit Description

Interface DescriptionEMII-800Service Manual Application Information
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and driver amplifier providingoverallboard area and cost savings. RFT3100 functionalityis
specificallycontrolled from the MSM5100 viathethree-line serial bus interface(SBI).
Designed to meetthe requirements for globalCDMA markets,the RFT3100 willoperate over the
followingTx frequencyranges :
Cellular band 824MHz ~ 925MHz
PCSband 1750MHz ~1910MHz
2.3. Upconverter (U104)
Upconverters made up of a mixer part and Driver AMP part. The mixer partis used toreceive
double-balancedOUT+andOUT- of transmit AGC frombaseband and mix the outputof VCO (U171) withUHF
outputsignal,whereas the Amppartis used tobuffer the output ofthis mixer. U105 has the operationrangeof
RF500MHz~1500MHzand has the conversion gain of 0dB. In addition, the suppression of spurious signals which
are unwanted noise isabout30dBc when being compared to RF output. The IFinputsignal rangeof the mixer is
DC~200MHz. Theisolation on RF output terminal and LO signal input terminal attheIF inputterminal is 30dB.
The range of LO signal thatcanbe inputtedis 300~1700MHzand power levelis -6~0 dBm.
2.4. TransmitBandpass Filter (FL101)
Transmitsignals thathavebeen converted fromIFsignals intoRF signalsafterpassingthroughthe upconverter
U105 are inputted intothe Power Amp U103 after passingonce again throughRF BPF F101inorderto filter out
noise signalsamplified during the amplificationofRF signals after goingthrough upconverter(U105).This is
carriedoutinorder tocreate power levelinputtedto the Power AMP viaRF BPF FL101 ILof two RF BPFs is
4dBas amaximum,whereas theripplein the passingbandis 2dB(maximum). Thedegree of the suppressionof
transmitsignalson receive band isatleast20dB or greater. The maximumpower that canbe inputted isabout
25dBm.
2.5. Power Amplifier (U103)
The power amplifier U102 that can be used inthe CDMA and FM mode has linearamplificationcapability,
whereas inthe FM mode, ithas ahighefficiency.Forhigher efficiency,itis made up of oneMMIC(Monolithic
Microwave Integrated Circuit) forwhichRF inputterminaland internalinterface circuitareintegratedonto one IC
after goingthroughtheAlGaAs/GaAs HBT (heterojunctionbipolar transistor)process. The moduleof power
amplifier is madeupof anoutputend interface circuitincludingthisMMIC. The maximumpower that can be
inputted through the input terminal is+17dBmandconversiongainis about28dB. RF transmitsignalsthat have
beenamplified through the power amplifier are senttothe duplexerandthen,sentouttothe cellsitethroughthe

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antenna inorder toprevent any damages on circuits, that maybe generated byoutputsignalsreflected fromthe
duplexer and re-inputtedto the poweramplifier output end.
2.6. Description of Frequency Synthesizer Circuit
2.6.1 Voltage Control Temperature Compensation Crystal Oscillator(TCX201, VCTCXO)
The temperature rangethatcan be compensated by TCX201 which is the reference frequency generator of mobile
terminalis -30~+80degrees. TCX201 receives frequency tuning signals calledTRK_LO_ADJfromMSM as
0.5V~2.5VDC via RandCfilters inordertogeneratethe reference frequencyof19.68MHzandinputitinto the
frequencysynthesizer of UHF band. Frequencystabilitydepending ontemperature is 2.0 ppm.
2.6.2 UHFBand Frequency Synthesizer (U202)
Reference frequencythat can be inputted to U202 is 3MHz~40MHz. It is the dual mode
frequencysynthesizer (PLL) that cansynthesize the frequencies ofUHF band50MHz~1200MHz andIF band
20MHz~300MHz. U202 that receives the reference frequencyof 19.68MHz from U174 creates 30kHz comparisonfrequency
withthe use ofinternal programand then, changes the frequencyof900MHz band inputted fromX200whichis the voltage
adjustment crystal oscillatorintothe comparison frequencyof30kHz at the prescaler in U202.Then,twosignal differences are
calculatedfromthe internal phase comparator. The calculated difference is inputted to DC for adjustingthe frequencyof U202
throughU202 No.2 PIN andexternal loopfilter in order to generate UHF signals. In addition,outputs ofother PIN17are
inputtedinto BBAafter goingthroughthe VRACTOR diodeandtankcircuit so that the outputs of BBA internal receiveend
VCO are adjusted to 170.76MHz.
2.6.3 Voltage Control Crystal Oscillator (U204)
U171 that generates the LO frequency(900MHz) of mobileterminal receives the outputvoltageofPLL U202 and
then, generates the frequency of 954MHzat0.7V and the frequency of980MHz at 2.7V.The sensitivityon control
voltageis23MHz/vand theoutput level is1dBm(maximum). Since LO frequencysignal is very importantfor the
sensitivityof mobile terminal, they musthave good spurious characteristics. U174 is -70dBc(maximum).