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  • 1. GSM Transceiver IC Uses Leading-Edge High-Frequency Front End Technology DuettoDC CXA3345GL s Four-Band support for Cellular phones are now used worldwide, CXA3345GL introduced here is a with GSM cellular phones having the transceiver IC that adopts the latest first time in the industry largest number of subscribers. GSM is leading edge high-frequency front end · Four high-sensitivity widely used in many countries in Europe, technology. Thus Sony provides an ideal receiver LNA circuits North America, Asia, and Oceania. Last transceiver IC as a solution that aims to Sensitivity: –107 dBm year, Japan became an early adopter of create the leading handset in the GSM the W-CDMA third-generation cellular cellular phone market, which is the · Wide range VCO/PLL phone. The third generation is expected world’s largest cellular phone market. circuits that support to see worldwide standardization. Until now, GSM transceivers have Sony has developed many high-frequency adopted the common superheterodyne all four bands front-end products for these cellular reception method and the sum loop · Four-Band Low-Noise phone systems, including antenna transmission method. The superhetero- switches, power amplifiers, IF*1 ampli- dyne technique first converts the received High-Output Transmit- fiers, RF*2 amplifiers, and RF transceiv- signal (RF) to an intermediate frequency ter Modulator ers (transmitter/receiver devices). Sony (IF) before extracting the baseband has a proven track record as a first signal. This means that two frequency s Support for EDGE vendor in this area, from first-generation synthesizers, one for the RF signal and transmission and re- handsets through Japan’s W-CDMA one for the IF signal, are required. These ception cellular phones. Sony devices are rated synthesizers are formed from VCO*3 and highly by many handset manufacturers. PLL*4 circuits. However, since low phase s Fabricated in a high- Sony has extensively analyzed the noise and high-speed locking are required performance 0.25 µm question of what are desirable solutions for GSM dual mode transceivers while as the synthesizer performance, the usual solution has been to develop these as SiGe BiCMOS process keeping the IMT-2000 standard separate ICs. W-CDMA technique, which will become Additionally, a SAW filter*5 is required s Lead-free and halo- the third generation worldwide unified to acquire adequate IF frequency selec- gen-free ultraminia- standard, in sight. The DuettoDC tivity. Since it is difficult to integrate this ture leadless package: 7 × 7 × 1.1 mm CY 2001 CY 2002 CY 2003 CY 2004 CXA3345GL DuettoDC2 DuettoDC3 CXA3320ER DuettoDC Customized Customized GSM TI/Philips/Agere/ADI BB version version CXM3000GA module Direct conversion Quad LNA + PLL + VCO DCR For UMTS Harmony DC Dual GSM/UMTS Dual mode mode Zero-IF DM For UMTS (tentative) RX IF CXA3328EN/ DCR ASIC CXA3328TN Customized DCR/DM CXM4001GA/ DCR version W-CDMA CXM4002GA TX/RX/PLL + VCO Low cost DM TX IF CXA3309ER/ module DM Customized transceiver ASIC CXA3329ER version module Direct conversion s Figure 1 GSM/3G (WCDMA/UMTS) IC Development Roadmap
  • 2. component on an IC chip, an external *6: There are several handsets, including dual component is used. Another issue is that Four-Band Support for First band (the 900 MHz/1800 MHz handset), triple band (the 900 MHz/1800 MHz/1900 although the sum loop technique used for Time in the Industry MHz handset), and quad band (the 850 MHz/ transmission is effective at reducing trans- 900 MHz/1800 MHz/1900 MHz handset), mission noise, it requires a power VCO The GSM system for cellular phones is and there are handsets that fit particular uses, such as Europe-only handsets, or dual circuit in the output block for transmis- the system used in the most regions world- Europe/USA handsets. sion. wide. As long as you have a handset*6 To overcome these problems, Sony has that supports the frequency bands developed, for the CXA3345GL, both a allocated for the countries you will be direct conversion receiver for the receiver traveling to, travelers and businessmen block and a direct modulation transmitter who go from country to country will be for the transmitter block. These new ap- able to use the same GSM cellular phone proaches allowed Sony to create an ideal they use in their home country in the same GSM transceiver solution. way, i.e. with the same phone number. Up to now, the main services have been the *1 IF: Intermediate frequency 900 MHz band and 1800 MHz band ser- *2 RF: Radio frequency *3 VCO: Voltage controlled oscillator vices used in Europe, Asia, and Oceania, *4 PLL: Phase locked loop and the 1900 MHz band in North *5 SAW filter: Surface acoustic wave filter America. The 850 MHz band service used in the US has been added to this list. By supporting all 4 of these bands, the CXA3345GL supports all GSM cellular phone frequency bands used worldwide. New product: CXA3345GL Conventional product:CXM3000GA Package: VFLGA-84P-01 Package: LFLGA-60P-01 IF SAW RF LNA 1900 SAW RF LNA I RF LNA Easy SW 1800 SAW SAW I RF LNA RF RF 900 SAW LNA Q SAW SAW Q Base band RF LNA LNA 850 SAW Div Base band monitor CXA3345GL SW Loop Div filter VCO PLL Div I 1800/1900 Loop filter Q Sum RF RF SAW 900 I SAW Sum RF APC SAW CXM3000G RF 850 Sum SAW Control Q RF VCO PLL1 IF VCO PLL2 s Figure 2 CXA3345GL Block Diagram
  • 3. this device must support is an extremely obviates the need for the IF SAW filter Four-Band High-Sensitivity wide range spanning 1166 MHz. used in conventional products. The Reception LNA To cover this range, the CXA3345GL in- CXA3345GL also includes circuits that cludes an on-chip 4 GHz wideband VCO. automatically correct the DC offset can- Sony designed a new low noise amplifier It also includes a ∆∑ PLL circuit that uses cellation and the baseband filter cutoff. (LNA) with a noise figure of 3 dB a 26 MHz reference frequency. These cir- This device provides stable reception optimized for each band using a newly- cuits achieve both low phase noise and characteristics even when the gain is set developed high-performance SiGe high-speed locking while covering this in 2 dB steps within the wide dynamic bipolar transistor (fTmax: 50 GHz, wide frequency range. The CXA3345GL range provided by the device. (See fig- NFmin: 0.7 dB), and achieved a recep- covers transmission and reception of all ures 3 and 4.) tion sensitivity of –107 dBm. four bands using a single VCO and a single PLL circuits. Furthermore, the high-speed frequency locking provides a Four-Band Low-Noise High- Four-Band Wide Range more than adequate control time for han- Output Transmitter Modulator VCO/PLL dling GPRS. The transmitter block also uses a direct The lowest frequency used in any of the conversion technique, in particular, it con- four bands is the 824 MHz transmission Direct Conversion Receiver verts the baseband signal directly using a frequency used in the 850 MHz band, and direct modulation technique. This obvi- the highest frequency is the 1990 MHz In the CXA3345GL, the signal amplified ates the need for the VCO used by the con- reception frequency used in the 1900 by the LNA is directly converted to a ventional sum loop technique. Direct MHz band. Thus the frequency range that baseband signal by the mixer circuit. This CF : 905 MHz –10 RBW : 30 kHz 400 Ω Differential –20 VBW : 30 kHz SWT : 5 ms –30 200 kHz : –35.9 dBc 200 Ω 40 kΩ 400 kHz : –68.8 dBc Differential Minimum –40 600 kHz : –74.1 dBc –50 –60 –70 Noise figure Input 1 dB compression point –80 Spec (typ.) Measured (high gain mode 900 MHz) –90 3.5 dB 2.4 dB 900 MHz Spec (typ.) Measured –100 3.5 dB 2.3 dB 1900 MHz –20 dBm –18 dBm –105 Center 900 MHz 200 kHz/ Span 2 MHz s Figure 3 Dynamic Range s Figure 5 GSM900 GMSK PN15 Transmit Mask BB gain change 10 CF : 900 MHz –10 RBW : 30 kHz 0 VBW : 30 kHz –20 Output [dBm] –10 SWT : 6 ms –30 200 kHz : –38.6 dBc –20 400 kHz : –70.3 dBc –40 600 kHz : –77.3 dBc –30 –50 –40 –60 –50 –70 0 10 20 30 40 50 60 Gain setting –80 BB2/3 Gain step 2 ±0.2 dB –90 Spec Measured (typ.) –100 –105 ±0.8 ±0.4 Center 900 MHz 200 kHz/ Span 2 MHz s Figure 4 Gain Steps s Figure 6 GSM900 EDGE Transmit Spectrum
  • 4. modulation can also support EDGE trans- mission. (See figures 5, 6, and 7.) Ultraminiature Leadless Future Developments Package At the same time as developing multiple Achievement of the No. 1 BoM In addition to integrating the LNA, VCO, versions to provide fine-grained support and PLL circuits on the same chip, the for a wide range of handset types, Sony In designing the CXA3345GL, we CXA3345GL is also provided in an will continue to aim for devices that applied a wide range of benchmarks for ultraminiature package with dimensions achieve even lower BoM levels. Sony will reducing the total number of external parts of 7 × 7 × 1.1 mm. (See figure 10.) The also be working on the fusion of the GSM in the parts list for the RF block, in CXA3345GL uses 60 pins as electrical and W-CDMA systems with dual mode particular, looking at the question of signal lines, and provides 24 thermal devices by developing and integrating integrating which components would be ground pins in the center of the package direct conversion receiver and direct the most effective (due to their cost) at for reduced thermal resistance. The pack- modulation transmitter circuits for reducing total cost. As a result, the age is an 84-pin VFLGA*8 package with W-CDMA as well. Sony is currently CXA3345GL holds the end product a land pitch of 0.65 mm. It also features developing a W-CDMA power amplifier BoM* 7 to extremely low levels by improved mounting strength lands at the module and a GSM power amplifier + integrating the VCO, PLL, and LNA four corners. The materials used are both switch module. Sony is committed to circuits on the same chip, and by lead free and halogen free, making the developing easy-to-use RF chip sets that eliminating the IF SAW filter and the CXA3345GL an environmentally feature increased functionality and higher transmitter power VCO components. friendly RF block solution. integration levels based on compound Thus the CXA3345GL is an extremely module technologies. Keep your eye on cost-competitive RF block solution. (See *8 VFLGA: Very Low Profile Fine Pitch Land Sony for your RF needs. figures 8 and 9.) Grid Array *7 BoM: Bill of Materials IC Mold Chip Interposer VFLGA-84P-01 Standard EDGE CXA3345GL CF : 900 MHz SR : 270.833 kHz s Figure 7 GSM900 EDGE Transmit Constellation 7 × 7 × 1.1 = 53.9 mm3 [Count] [mA] 60 150 CXM3000GA 0 Sony 0 8 × 8 × 1.3 = 83.2 mm3 Company "A" Company "B" Sony Company "A" Company "B" LCR Passive Active RX TTL TX TTL s Figure 10 Ultraminiature Leadless Package s Figure 8 RF Component BoM s Figure 9 TX/RX Power