CCS Technical Documentation NEM-2 Series Transceivers System Module and User Interface Issue 1 07/03 Copyright Nokia. All rights reserved.
NEM-2 System Module and User Interface CCS Technical Documentation Table of Contents Page No Glossary of Terms .......................................................................................................... 5 Introduction.................................................................................................................... 8 Electrical Modules .......................................................................................................8 Interconnection Diagram ..........
CCS Technical Documentation NEM-2 System Module and User Interface Supply Voltage Distribution ......................................................................................36 Phone....................................................................................................................... 37 Audio Player............................................................................................................ 38 Power Up, Power Down and Reset ...........................................
NEM-2 System Module and User Interface CCS Technical Documentation Transmitter .................................................................................................................59 Front End................................................................................................................. 60 Power Amplifier...................................................................................................... 61 RF ASIC Helgo ......................................................
CCS Technical Documentation NEM-2 System Module and User Interface Glossary of Terms ACI Accessory Control Interface ADC Analog-Digital Converter AEC Acoustic Echo Canceller AFC Automatic Frequency Control AGC Automatic Gain Control ALWE Background noise suppressor AMS After Market Service API Application Programming Interface ARM Processor architecture ASIC Application Specific Integrated Circuit BB Baseband CBus Control Bus connecting UPP_WD2 with AEM and UEMK CMT Cellular Mobil
NEM-2 System Module and User Interface Page 6 CCS Technical Documentation DLL Dynamic Link Library DRC Dynamic Range Controller DSP Digital Signal Processor EGSM Extended – GSM EFR Enhanced Full Rate EGPRS Enhanced General Packet Radio Service EMC Electromagnetic compatibility EMI Electromagnetic Interference ESD Electro Static Discharge EXT RF External RF FBUS Asynchronous Full Duplex Serial Bus GPRS General Packet Radio Service GSM Global System for Mobile communications HS H
CCS Technical Documentation NEM-2 System Module and User Interface PC Personal Computer PCM Pulse Code Modulation PCM SIO Synchronous serial bus for PCM audio transferring PWB Printed Wiring Board RF Radio Frequency SIM Subscriber Identity Module UEMK Universal Energy Management UI User Interface UPP Universal Phone Processor VCXO Voltage Controlled Crystal Oscillator VCTCXO Voltage Controlled Temperature Compensated Crystal Oscillator. Issue 1 07/03 Copyright Nokia.
NEM-2 System Module and User Interface CCS Technical Documentation Introduction Electrical Modules The NEM-2 phone comprises two modules: the main PWB (EM21) and UI PWB (EM20) The system module EM11 consists of Radio Frequency (RF) and baseband (BB). User Interface (UI) contains only LCD connector, backlight LEDs, keypad layout and Earpiece circuit. FM radio is located on the main PWB EM21. The modules are connected with each other by B2B connectors.
CCS Technical Documentation NEM-2 System Module and User Interface Interconnection Diagram Figure 1: Interconnection diagram Issue 1 07/03 Copyright Nokia. All rights reserved..
NEM-2 System Module and User Interface CCS Technical Documentation Temperature Conditions Env. Condition Ambient temperature Note Normal operation -20°C … +55°C/ -4°F … +131°F Specifications fulfilled except FMR is only up to +14°F Reduced performance -40°C … -20°C/ -40°F… -4°F and +55°C … +85°C/ +131°F...+185°F For LCD only up to +176°F No operation or storage <-40°C or > +85°C/ <-40°F or > +185°F No operation or storage.
NEM-2 System Module and User Interface CCS Technical Documentation DC Characteristics Main Supply Signal min. typ. max. Unit Note VBAT 3.1 3.6 5.1 V Signal min. typ. max. Unit Note VANA 2.70 2.78 2.86 V Imax = 80mA VFLASH1 2.70 2.78 2.86 V Imax = 70mA, Isleep = 2.0mA VFLASH2 2.70 2.78 2.86 V Imax = 40mA VSIM 1.745 2.91 1.8 3.0 1.855 3.09 V V Imax = 25mA, Isleep = 0.5mA VIO 1.72 1.8 1.88 V Imax = 150mA, Isleep = 0.5mA VCORE 1.0 1.235 1.425 1.710 1.053 1.3 1.
NEM-2 System Module and User Interface CCS Technical Documentation Audio Player regulators Page 12 Signal min. typ. max. Unit Note AudioPlayerVcore 1.23 1.42 1.3 1.5 1.37 1.58 V default value 1.3V Imax = 300mA AudioPlayerVDD 3.23 3.0 3.3 3.37 V regulated mode; unregulated mode; Imax = 300mA AudioPlayerVMMC 3.23 3.0 3.3 3.37 V regulated mode; unregulated mode; Imax = 60mA Copyright Nokia. All rights reserved.
NEM-2 System Module and User Interface CCS Technical Documentation User Interface Modules Keyboard NEM-2 features a Qwerty keyboard, two soft keys and send/end keys with additional 4way rocker for gaming and music features. The keys are connected in a 6x7-matrix with the UPP. Key pressing is detected by scanning procedure. The applied “Bulls Eye” keypads are located on the UI board.
NEM-2 System Module and User Interface CCS Technical Documentation LCD & Keyboard Illumination For LCD illumination there are 3 white LEDs, which are integrated inside the LCD module. For driving the LEDs a DC-DC converter is used . The keypad is illuminated by 4 white LEDs driven also by the DC-DC converter. UI B2B-Connector Two UI B2B-connectors are used for connection between engine board and UI board. No. Symbol Parameter Min. typ. max. Unit Note 1 VIO Supply for LCD 1.72 1.8 1.
NEM-2 System Module and User Interface CCS Technical Documentation No. Symbol 1 GND 0 V 2 GND 0 V 3 KEYB_0 Keyboard Interface 0 1.8 V Column 0= P00 at UPP 4 KEYB_1 Keyboard Interface 0 1.8 V Column 1= P01 5 KEYB_2 Keyboard Interface 0 1.8 V Column 2 = P02 6 KEYB_3 Keyboard Interface 0 1.8 V Column 3 = P03 7 KEYB_4 Keyboard Interface 0 1.8 V Column 4 = P04 8 GENIO_2 Keyboard Interface 0 1.8 V Column 5 = “P05” 9 KEYB_5 Keyboard Interface 0 1.
NEM-2 System Module and User Interface CCS Technical Documentation System Module : Baseband Baseband Technical Specifications DC Characteristics Regulators and Supply Voltage Ranges Battery Voltage Range Signal Min. Nom Max Note VBAT 3.1V 3.6V 4.2V (charging high limit voltage) 3.1V SW cut off BB Regulators Signal Min. Nom Max Note VANA 2.70V 2.78V 2.86V Imax = 80mA VFLASH1 2.70V 2.78V 2.86V Imax = 70mA Isleep = 1.5mA VFLASH2 2.70V 2.78V 2.86V Imax = 40mA VSIM 1.745V 2.
NEM-2 System Module and User Interface CCS Technical Documentation VR3 2.70V 2.78V 2.86V Imax = 20mA VR4 2.70V 2.78V 2.86V Imax = 50mA Isleep = 0.1mA VR5 2.70V 2.78V 2.86V Imax = 50mA Isleep = 0.1mA VR6 2.70V 2.78V 2.86V Imax = 50mA Isleep = 0.1mA VR7 2.70V 2.78V 2.86V Imax = 45mA Current Sources Signal Min Nom IPA1 and IPA2 IPA3 and IPA4 Max Note 0mA - 5mA 50µA Programmable, +/-6% VIPA1,VIPA1 = 0V - 2.7V 100µA 105µA VIPA1 = 0V - 2.
NEM-2 System Module and User Interface CCS Technical Documentation Baseband External and Internal Signals and Connections This section describes the external and internal electrical connection and interface levels on the baseband. The electrical interface specifications are collected into tables that cover a connector or a defined interface.
NEM-2 System Module and User Interface CCS Technical Documentation VR1A UEM HELGO Voltage 4.6 4.75 4.9 V 2 10 mA 240 nVr ms/ sqrt( Hz) 2.78 2.86 V 65 100 mA 120 nVr ms/ sqrt( Hz) 2.78 2.86 V 1 20 mA 240 nVr ms/ sqrt( Hz) 2.86 V Current 50 mA Noise density f=6Hz f=60Hz f>600Hz 5500 550 55 nVr ms/ sqrt( Hz) 2.86 V Current 50 mA Noise density BW=100Hz... 100kHZ 240 nVr ms/ sqrt( Hz) Current Noise density VR2 UEM HELGO Voltage 2.
NEM-2 System Module and User Interface VR6 VR7 VrefRF01 UEM HELGO UEM Voltage SHF VCO UEM CCS Technical Documentation HELGO 2.86 V Current 50 mA Noise density BW=100Hz... 100kHz 240 nVr ms/ sqrt( Hz) 2.86 V Current 30 mA Noise density 100Hz
NEM-2 System Module and User Interface CCS Technical Documentation Load Resistance MODE RFBusEn1X UPP (GenIO9) UPP PA HELGO (SLE) 10 220 kΩ Load Capacitance 20 pF Timing Accuracy 1/4 symbol ”1” 1.38 1.88 V ”0” 0 0.4 V Load Resistance 10 220 kΩ Load Capacitance 20 pF Timing Accuracy 1/4 symbol ”1” 1.38 1.88 V ”0” 0 0.
NEM-2 System Module and User Interface CCS Technical Documentation Table 3: AC and DC Characteristics of DCT4 RF-Baseband Analogue Signals Signal name From To Parameter Min VCTCXO VCTCXO UPP Frequency 13 Signal amplitude 0.2 Input Impedance 10 Typ 0.8 Vpp dBc Clear signal window (no glitch) 200 Duty Cycle 40 mVpp 60 UEM Voltage swing (static) 1.35 1.4 DC level 1.3 1.35 0 I/Q amplitude mismatch % V Ground for reference clock 1.45 Vpp Received demodulated IQ signals 1.
NEM-2 System Module and User Interface CCS Technical Documentation Resolution RFTemp IPA1 / IPA2 HELGO UEM UEM (PATEMP) PA 10 Voltage at -20oC 1,57 Voltage at +25oC 1,7 Voltage at +60oC 1,79 V Temperature sensor of RF. PA final stage quiescent current adjustment Output Voltage 0 2.7 V Current range 0 5 mA Resolution 4 Current tolerance -6 Noise density f=100 Hz- 800kHz f=800kHz-100MHz Issue 1 07/03 bits Copyright Nokia. All rights reserved..
NEM-2 System Module and User Interface CCS Technical Documentation FM Radio Interface BB Signal FM Radio Signal Min Nom Max VFLASH2 Vcca 2.7V 2.78V 2.86V Imax =10.5 mA Vcc(vco) 2.7V 2.78V 2.86V Imax =940 µA Vccd 2.7V 2.78V 2.86V Imax = 3.9 mA FMClk 1.4V 0 1.8V 1.88V 0.4V GenIO(3) 32kHz 30ppm Condition Note High Low Reference clock for FM radio module Frequency Also 6.5 MHz can be used Stability GenIO(8) FMWrEn 1.4V 0V 1.8V 1.88V 0.
NEM-2 System Module and User Interface CCS Technical Documentation Internal Speaker Signal Min Nom Max Condition Note 0.75V 0.8V 2.0 Vpp 0.85V AC DC Differential output (Vdiff = 4.0 Vpp) 0.75V 0.8V 2.0 Vpp 0.85V AC DC Min Nom Max Condition Note 0.75V 0.8V 2.0 Vpp 0.85V AC DC Differential output (Vdiff = 4.0 Vpp) 0.75V 0.8V 2.0 Vpp 0.85V AC DC EARP EARN Integrated HF Speaker Signal IHFP IHFN Issue 1 07/03 Copyright Nokia. All rights reserved..
NEM-2 System Module and User Interface CCS Technical Documentation External Signals and Connections Battery connector The design is based on “Demi” battery connector.Bottom Connector No. Symbol 1 VBAT 2 BSI 3 4 Parameter Min. typ. Max. Unit Note 3.1 3.6 5.
NEM-2 System Module and User Interface CCS Technical Documentation No. Symbol Sig. Description min. tip. Max. Unit Note 1 Charge V charge 7.0 8.4 9.2 VRMS Fast charger 850 MA 2 GND Charge GND 0 V 850 3 ACI ACI 1 0 4 Vout DC out USB Vbus DC in 4.375 6 USB D+ Pos. diff. data 7 USB D- Neg. diff. data 8 USB data GND Data GND 9 XMIC N Audio In 11 12 XMIC P HSEAR N HSEAR P Issue 1 07/03 V Voltage level valid for DCT4 47 Ohm Max.
NEM-2 System Module and User Interface 13 HSEAR R N 14 HSEAR R P CCS Technical Documentation Audio Out Audio Out 30 0 V Unbalanced HSEAR design Audio GND Right, decoupling FM antenna signal 10 Ohm Max. serial impedance 20k Hz Frequency range -3dB points With load 32 ohm (headset) 1 V DC Plug NMP standard 2- or 3-wire chargers are compatible with the Pop-Port connector. The IF does not support 3-wire charging control. No. Symbol Signal Description min. typ. Max.
NEM-2 System Module and User Interface CCS Technical Documentation SIM connector No. Symbol Parameter min. typ. max. Unit No. 1 SIMCLK Frequency 1.05 3.25 3.36 MHz 1 50 ns Trise/Tfall 2 SIMRST 3 VSIM duty cycle 40 60 % Voh 0.9 * VSIM VSIM V Vol 0 0.15*VSIM V 3V SIM Card 2.8 3.2 V 3.0 6 1.8V SIM Card 4 GND 5 n. c. 6 DATA 2 3 mA 1.6 1.8 ground 2.0 0 V 4 5 Voh 0.9*VSIM VSIM V Vol 0 0.15*VSIM V Vih 0.7*VSIM VSIM V Vil 0 0.
NEM-2 System Module and User Interface CCS Technical Documentation Internal Signals and Connections Internal microphone Symbol Parameter MICP Min. typ. max. Unit Note Differential Input P 200 mVpp 1kOhm to MICB MICN Differential Input N 200 mVpp 1kOhm to GND MICB Microphone Bias 2.0 2.1 2.25 V DC Min. typ. max. Unit Note Internal speaker Symbol Parameter EARP differential out 2.0 Vpp AC, (Vdiff = 4.0 Vpp) EARN differential out 2.0 Vpp AC Vibra Signal VIBRA Min.
NEM-2 System Module and User Interface CCS Technical Documentation Stereo Codec Two different interfaces are used between DSP and codec, which runs in master mode: • I2C control interface • audio data interface (I2S) I2C control interface is used for transferring low speed control information between application DSP and codec. Signal specification of the control interface is given below. Symbol Parameter Min. SDA serial data SDL serial clock typ. Max. Unit Note 0 3.
NEM-2 System Module and User Interface CCS Technical Documentation Phone- Audio Player Interface (MADI) DCT4 Phone- Audio Player interface signals are specified below. Also the nick name MADI (MCU- ADSP Interface) is frequently used. Refer to section Functional Description for further details of the DCT4 Phone- Audio Player interface concept. Symbol Parameter Min. AudioPlayerPwrOn Audio Player power enable AudioPlayerResetX typ. Max. Unit Note 0 1.
CCS Technical Documentation NEM-2 System Module and User Interface Baseband Functional Description Modes of Operation EM21 baseband has six different functional modes: • No supply • Back-up • Acting Dead • Active • Sleep • Charging No Supply In NO_SUPPLY mode, the phone has no supply voltage. This mode is due to disconnection of main battery and backup battery or low battery voltage level in both of the batteries.
NEM-2 System Module and User Interface CCS Technical Documentation In Active mode the RF regulators are controlled by SW writing into EM’s registers wanted settings: VR1A can be enabled or disabled. VR2 can be enabled or disabled and its output voltage can be programmed to be 2.78V or 3.3V. VR4 -VR7 can be enabled, disabled, or forced into low quiescent current mode. VR3 is always enabled in Active mode. Sleep Mode Sleep mode is entered when both MCU and DSP are in stand–by mode.
NEM-2 System Module and User Interface CCS Technical Documentation Pin numbering of battery pack Signal name Pin number Function VBAT 1 Positive battery terminal BSI 2 Battery capacity measurement (fixed resistor inside the battery pack) BTEMP 3 Battery temperature measurement (measured by NTC resistor inside pack) GND 4 Negative/common battery terminal BLD-3 battery pack pin order Figure 4: 4(GND) 3(BTEMP) 2(BSI) 1 (+) Issue 1 07/03 Copyright Nokia. All rights reserved..
NEM-2 System Module and User Interface CCS Technical Documentation Supply Voltage Distribution The energy management of NEM-2 is based on DCT4 architecture and additional components for Audio Player power supply. A semi fixed battery supplies the DCT4 Phone part and the Audio Player part. UEMK includes several regulators to supply DCT4 Phone RF and baseband. It provides the energy management including power up and down procedure. Additional regulators are included for Audio Player supply.
NEM-2 System Module and User Interface CCS Technical Documentation Phone The Phone part supply voltage distribution is controlled by UEMK asic. There are six separate regulators used by baseband. Detailed DCT4 Phone supply voltage distribution diagram is shown in figure below.
NEM-2 System Module and User Interface CCS Technical Documentation Audio Player Audio Player power supply module consist of three different regulators, SMPS type for DSP core supply with different output voltages, 3.3V LDO type for peripherals and analog audio supply and 3.3V LDO type for MMC. Audio Player power supply is controlled by DCT4 Phone part via dedicated hardware signal AudioPlayerPwrEnable. Two supply voltages AudioPlayerVCore and AudioPlayerVDD are generated inside this block.
NEM-2 System Module and User Interface CCS Technical Documentation Figure 7: Audio Player Supply Voltage Distribution Diagram AudioPlayerVCore VBAT DSP DA250 SMPS (1.3/ 1.5V) clock CVDD RVDD Vout n. c. RCVDD n. c. RDVDD 460kHz Vout selection TOUT0 GPIO2 USBVDD DVDD AudioPlayerVDD ADVDD AudioPlayerPwrEn AVDD Flash VPP VCCQ VCC LDO (3.
NEM-2 System Module and User Interface CCS Technical Documentation Power Up, Power Down and Reset Phone Power up, power down and reset of DCT4 Phone part is controlled by the UEMK ASIC. Audio Player Audio Player power up, power down and reset is controlled by software via dedicated hardware signals AudioPlayerPwrEnable, AudioPlayerResetX and AudioPlayerFlashRPX. Figure below shows the block diagram including Phone reset, Audio Player power control and Audio Player reset signals.
NEM-2 System Module and User Interface CCS Technical Documentation This clock is distributed to audio codec as well. Figure 9: Clock Distribution Diagram VR3 VCTCXO HELGO HELGO hHELGA 26 MHz 26MHz 26 MHz 32 kHz UEMK UEM 32 kHz SLEEPX UPP SLICER RFBUSCLK 13MHz CBUSCLK 1MHz MCU DSP PLL DBUSCLK 13MHz LCDCLK max. 6.5MHz CTSI Issue 1 07/03 Copyright Nokia. All rights reserved.. SIMCLK max. 3.
NEM-2 System Module and User Interface CCS Technical Documentation Phone- Audio Player Interface (MADI) Phone- Audio Player interface consists of different signals groups: • power and reset • wake- up • communication • audio Power and Reset Three signals are used for Audio Player power supply control and reset: • AudioPlayerPwrEnable • AudioPlayerResetX • AudioPlayerFlashRPX AudioPlayerPwrEnable controls power supply of Audio Player. It is active high, default state after reset is low.
CCS Technical Documentation NEM-2 System Module and User Interface Communication interface specified below provides wake- up capability as well. Either DCT4 Phone or Audio Player will wake- up on activity at the receive lines. Communication DCT4 Phone- Audio Player communication interface is serial, UART based asynchronous interface. Two lines (RxD and TxD) are used. At DCT4 Phone side LPRF UART of UPP is used. At Audio Player side McBSP0 of DA250 is used.
NEM-2 System Module and User Interface CCS Technical Documentation Audio routing and conditioning The analog audio sources FM radio and line in are mixed and level conditioned in a passive stereo mixer and then fed through the Audio Codec RLINEIN and LLINEIN. The GSM downlink from the UEMK HFOUT for headset is added by the codec mono analog input (MICIN). Source selection is controlled by software using the mute function for GSM downlink and power on/off for FM radio.
CCS Technical Documentation NEM-2 System Module and User Interface Figure 10: Audio block diagram Tomahawk ACI UEM HeadInt XMICP UEM Mic2P XMICN UEM Mic2N HSEARRP HSERARN HSEARLP HSEARLN FM-Antenna LineIn Detection LineIn UEM HFOUT DA250 FMradio LM4890 DA250 CodecClk APAShutDown I2C interface Issue 1 07/03 Copyright Nokia. All rights reserved..
NEM-2 System Module and User Interface CCS Technical Documentation FM Radio The FM radio in the transceiver NEM-2 is a single chip electronically tuned FM stereo radio with fully integrated IF selectivity and demodulation. The FM radio is completely adjustment free. It can be tuned the European, US and Japanese FM bands. The channel tuning and bus data are controlled by UPP. The FM-antenna signal is generated out of the HSEARRN and HSEARN signals from the bottom connector.
NEM-2 System Module and User Interface CCS Technical Documentation Figure 11: SIM interface NEM-2 SIM SIMIO UPP UEMK UEM SIMIO C5 C6 C7 C8 C1 C2 C3 C4 SIM ASIP SIMClk SIMRst VSIM SIMIO SIMClk SIMClk SIMRst SIMR t SIMIF register UIF Block From Battery BSI UEM digital logic UEMInt CBusDa CBusEnX CBusClk MultiMediaCard MMC NEM-2 uses a MMC as memory for the MP3/AAC files. Records from line in or FM radio can be saved on this card. Also music files via USB can be stored on the MMC.
NEM-2 System Module and User Interface CCS Technical Documentation External Accessory Regulator An external LDO Regulator exists for accessory power supply purposes. All ACI-accessories require this power supply. Regulator input is connected to battery voltage VBAT and output is connected to Vout pin in the system connector. Regulator is controlled via UPP (On/Off-function). Accessory Regulator Signals Signal Min. Nom Max Note Vout 2.70V 2.78 2.86V Imax = 150mA GenIO(0) 1.4 1.8 1.88 0.
CCS Technical Documentation NEM-2 System Module and User Interface Microphone The microphone is embedded into the B-cover. IT features a sensitivity of 42+/-2dB (0dB=1V/Pa at 1Khz). Its impedance is 1.4kohm. Polarity as shown: Figure 13: Microphone Polarity Ringing tone speaker Alerting tones, as MP3, AAC, MIDI or conventional sinusoidal files are made audible by an integrated loudspeaker. The acoustic pressure level requirement for these ringing tones is 105dB(A) at a distance of 5cm.
NEM-2 System Module and User Interface CCS Technical Documentation Headset The headset HDS-3H used is a passive type with stereo headphone and integrated microphone. It is possible to use a 3rd party stereo headphone with 3.5mm jack plug via adapter from 3.5mm jack to the Pop-Port plug at the connector. With the same adapter the output can be used as line out for an external device. Batteries Main Battery 780mAh Li-Ion battery pack BLD-3 is used. No other battery packs can be used.
CCS Technical Documentation NEM-2 System Module and User Interface RF Module Introduction The RF module performs the necessary high frequency operations of the GSM850/ GSM1900 dualband engine. Both the transmitter and receiver have been implemented by using direct conversion architecture which means that the modulator and demodulator operate at the channel frequency. The core of the RF is an application-specific integrated circuit, Helgo.
NEM-2 System Module and User Interface CCS Technical Documentation RF Frequency Plan RF frequency plan is shown below. The VCO operates at the channel frequency multiplied by two or four depending on the frequency band of operation. This means that the baseband modulated signals are directly converted up to the transmission frequency and the received RF signals directly down to the baseband frequency. Figure 15: RF Frequency plan .
CCS Technical Documentation NEM-2 System Module and User Interface DC characteristics Regulators The transceiver baseband section has a multi function analog ASIC, UEMK, which contains among other functions six pieces of 2.78 V linear regulators and a 4.8 V switching regulator. All the regulators can be controlled individually by the 2.78 V logic directly or through a control register.
NEM-2 System Module and User Interface CCS Technical Documentation Typical current consumption The table shows the typical current consumption in different operation modes. Operation mode Current consumption Notes Power OFF < 10 uA RX, GSM850 75 mA, peak RX, GSM1900 70 mA, peak TX, power level 5, GSM850 1800 mA, peak Efficiency: ca. 45% TX, power level 0, GSM1900 1100 mA, peak Efficiency: ca. 40% Page 54 Copyright Nokia. All rights reserved.
CCS Technical Documentation NEM-2 System Module and User Interface RF characteristics Power Distribution Figure 16: Power distribution diagram LNA GSM1900 Issue 1 07/03 Helgo RX / TX parts PLL Copyright Nokia. All rights reserved..
NEM-2 System Module and User Interface CCS Technical Documentation Channel Numbers and Frequencies System Channel number TX frequency RX frequency Unit GSM850 128 <= n <=251 F = 824.2 + 0.2 * (n-128) F = 869.2 + 0.2 * (n-128) MHz GSM1900 512 <= n <= 810 F=1850.2 +0.2*(n-512) F=1930.2+0.2*(n-512) MHz Main RF characteristics Parameter Unit and value Cellular System GSM850, GSM1900 RX Frequency Band GSM850: 869...894 MHz GSM1900: 1930...1990 MHz TX Frequency Band GSM850: 824...
NEM-2 System Module and User Interface CCS Technical Documentation Receiver characteristics Item Values, GSM850/GSM1900 Type Direct conversion, Linear, FDMA/TDMA LO frequencies 3476...3576 MHz / 3860...3980 MHz Typical 3 dB bandwidth +/- 91 kHz Sensitivity min.
NEM-2 System Module and User Interface CCS Technical Documentation RF Block Diagram NEM-2 Figure 17: RF Block Diagram HELGO 3290 - 3980 MHz Copyright Nokia. All rights reserved.
CCS Technical Documentation NEM-2 System Module and User Interface Frequency Synthesizers The VCO frequency is locked by a PLL (phase locked loop) into a stable frequency source given by a VCTCXO which is running at 26 MHz. The frequency of the VCTCXO is in turn locked into the frequency of the base station with the help of an AFC voltage which is generated in UEMK by an 11 bit D/A converter. The PLL is located in Helgo and it is controlled through the RFBus.
NEM-2 System Module and User Interface CCS Technical Documentation Front End The front end features include: - Antenna 50 ohm input - RX GSM1900 single output, RX GSM850 balanced output - TXs single 50 ohm input -3 control lines from the Helgo Figure 18: Front End V _ a n t 1 , 2 , 3 R X G S M 8 5 0 A n te n n a R X G S M 1 9 0 0 T X G S M 8 5 0 Page 60 T X G S M 1 9 0 0 Copyright Nokia. All rights reserved.
NEM-2 System Module and User Interface CCS Technical Documentation Power Amplifier The power amplifier features include: - 50 ohm input and output for GSM850/GSM1900 - internal power detector - Mode: GSM/EDGE Figure 19: Power amplifier G S M 8 5 0 o u t G S M 8 5 0 in G S M 1 9 0 0 o u t G S M 1 9 0 0 in G S M 8 5 0 P o w e r C o n tro l P o w e r D e te c to r G S M 1 9 0 0 P o w e r C o n tro l M o d e G S M /E D G E RF ASIC Helgo The RF ASIC features include - Package uBGA108 - Balanced I/Q dem
NEM-2 System Module and User Interface Page 62 CCS Technical Documentation Copyright Nokia. All rights reserved.
