Foreword
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In recent years, multi-function applications such as adding cameras, GPS, mobile TV broadcasting, and NFC to mobile phones have attracted attention. At the same time, with the rise of high-end devices equipped with high-performance application processors such as smartphones and tablet devices, in addition to today's call functions, comfort, fast browsers, streaming media, data access, and cloud-ready functions have been added. It is a brand new service for navigation, and high-quality communication functions have become an essential element.
As a function jointly sought by these mobile terminals, we will exemplify the correspondence of various networks. The mainstream of mobile communication specifications to date is still a 2G system called GSM (Global System for Mobile Communications). The 3G system UMTS (Universal Mobile Telecommunications System), which is equipped with higher quality and faster data transmission than GSM, is now common. Recently, some major countries have begun services for this next-generation communication specification called LTE (Long-Term Revolution), and wireless can also perform high-speed data communication like wired.
A typical portable terminal usually cannot communicate data during a voice call. SVLTE (Synchronous Voice and LTE) communication services that can also perform data communication when voice calls are prevalent in North America. In addition, in China, GSM is used for voice services, and TD-LTE (TDD system LTE) for data communication. Both of these simultaneous SGLTE (Synchronous GSM and LTE) communication services are also planned, IC manufacturers and The correspondence of the assembly manufacturers has also been carried out quickly.
TDD and TD-LTE
The TDD (Time Division Duplex) refers to a method in which radio waves of the same frequency are used for the uplink and downlink lines by one of the communication methods of the base station and the mobile terminal in both directions. In contrast, the way in which the upstream and downstream lines use different frequency waves is called FDD (Frequency Division Duplex).
Figure 1: Comparison of TDD and FDD
LTE is the communication specification for mobile phones. This specification was certified by the standard 3GPP organization (3rd Generation Partnership Project) in March 2009. It is an intermediate technology between UMTS (3rd generation mobile phone) and the future 4G (4th generation mobile phone). At that time, it was called 3.9G. It was renamed 4G because it was approved by the ITU (International Telecommunication Union). Name it like this.
In general, in most cases, FDD-LTE using FDD is called LTE, not FDD-LTE, which is distinguished from LTE, which is called TD-LTE, which uses TDD. TD-LTE can transmit and receive at the same frequency. It can be said that the frequency configuration is relatively simpler than FDD-LTE. TD-LTE basically has the same technical difference as FDD-LTE except for the difference between FDD and TDD. It uses the same frequency band as 3G, and can be bandwidth width 1.4, 3, 5, 10 according to different situations. 15, 20MHz choose to use. LTE only supports packet communication. Voice communication is supported by VoIP technology called VoLTE. Generally speaking, it mainly supports data communication. It takes time to truly popularize voice services. TD-LTE is a service project that China is actively promoting. Japan has also begun to use 2.5GHz bandwidth for services. North America is also planning, and it is obvious that it will become popular all over the world.
TD-LTE RF circuit
As shown in FIG. 2, it is a circuit diagram of TD-LTE (SGLTE).
Figure 2: Circuit diagram of TD-LTE (SGLTE corresponding)
In the current TD-LTE corresponding terminal, in order to correspond to voice calls, triple mode and dual mode GSM and UMTS are indispensable. GSM has foreseen the problem of overseas roaming. Therefore, it can generally correspond to four different frequency bands of 850MHz, 900MHz, 1800MHz, and 1900MHz, and each of the frequency bands on the receiving side is equipped with filters one by one. The band1 of UMTS is FDD, so a duplexer (antenna duplexer) is required.
In China, the frequency bands for TD-LTE are classified into Band38, Band39, and Band40 according to 3GPP. Since it is a TDD system and does not require a duplexer, the transmission side has a filter corresponding to high power, and two credit filters are used on the main circuit side. The LTE system corresponds to the MIMO technology, and since it is a multi-antenna structure, a plurality of circuit sides are equipped with a credit filter.
The circuit in the above figure is a SGLTE circuit in which voice and data can communicate simultaneously. Since two systems of GSM and TD-LTE operate simultaneously, it has the feature of carrying two transceiver ICs. However, when data on one terminal is simultaneously transmitted in two systems, it causes an interference phenomenon in which the transmission power is automatically returned from the other circuit, which may result in deterioration of the reception quality. Therefore, in each transmission circuit, in order to sufficiently reduce the power of the reception frequency, the design difficulty of assembly is remarkably increased. Murata Manufacturing Co., Ltd. developed the SGLTE terminal, which corresponds to the needs of the assembler, and uses the notch filter for TD-LTE (filter with function to reduce specific frequency only) and the GSM1800 receive filter for rapidly reducing TD-LTE bandwidth. Commercialization.
List of products for TD-LTE SAW equipment
The product lineup of all released TD-LTE SAW filters from Murata is shown in Figure 1.2.3. Table 1 is a duplexer, Table 2 is a notch, and Table 3 is a single filter.
Table 1: List of products for TD-LTE duplexers
Size (mm) | Application | Balanced | Impedance | MURATA P/N | Pin | Comment |
/Unbalanced | (Ω) | Assignment | ||||
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-200 | SAWFD1G90CP0F0A | 2in4out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-200 | SAWFD1G90CQ0F0A | 2in4out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-200 | SAWFD1G90CA0F0A | 1in4out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-200 | SAWFD1G90CB0F0A | 1in4out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-100 | SAWFD1G90CR0F0A | 2in4out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-100 | SAWFD1G90BH0F0A | 2in2out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-100 | SAWFD1G90AH0F0A | 1in2out | |
1.5×1.1×0.5 | Band34_Band39 | Unbalance | 50-50 | SAWFD1G90KA0F0A | 1in2out | |
1.5×1.1×0.5 | Band34_Band39 | Unbalance | 50-50 | SAWFD1G90KC0F0A | 1in2out | |
1.5×1.1×0.5 | Band34_Band39 | Unbalance | 50-50 | SAWFD1G90LA0F0A | 2in2out | |
1.5×1.1×0.5 | Band34_Band39 | Unbalance | 50-50 | SAWFD1G90KZ0F0A | 1in1out | |
1.5×1.1×0.5 | Band38_Band40 | Balance | 50-100 | SAWFD2G35CM0F0A | 2in4out | |
1.5×1.1×0.5 | Band38_Band40 | Balance | 50-100 | SAWFD2G35CA0F0A | 1in4out | |
1.5×1.1×0.5 | Band34_Band39 | Balance | 50-100 | SAWFD2G35BJ0F0A | 2in2out | |
1.8×1.4×0.5 | Band34_Band39 | Unbalance | 50-50 | SAWEN1G90PA0F0A | 1in2out | Post PA |
1.8×1.4×0.5 | Band38_Band40 | Unbalance | 50-50 | SAWEN2G35PN0F0A | 1in2out | Post PA |
Since the decision to develop TD-LTE, in order to respond to the RF area requirements of IC manufacturers and assemblers, the Band34 and Band39, Band38 and Band40 assembly duplexers have been commercialized. The duplexer is a popular product that combines the functions of peripheral devices and is often preferred.
As a pin connection, it is both a balanced and standard 2in4out model. The 1in4out model that combines the input SW function and reduces the number of LNAs to one by 2in2out models by binding the output of the filter. Being productized. As an unbalanced product, the standard 2in2out model, the 1in2out model with input SW function, and the 1in1out model with the input and output of Murata's original products are also commercialized. What type of pin connection is required depends on the transceiver IC and design ideas used by the assembler.
Table 2: List of products for TD-LTE notch filters
Size (mm) | Application | Balanced | Impedance | Type | MURATA P/N | Comment |
/Unbalanced | (Ω) | |||||
1.4×1.1×0.5 | N-DCS | Unbalance | 50-50 | Notch | SACEA1G81TA0F0A | Post PA |
1.4×1.1×0.5 | N-DCS | Unbalance | 50-50 | Notch | SACEA1G81TB0F0A | Post PA |
1.4×1.1×0.5 | N-DCS | Unbalance | 50-50 | Notch | SACEA1G82TA0F0A | Post PA |
1.4×1.1×0.5 | Band34_Band39 | Unbalance | 50-50 | Notch | SACEA1G90TB0F0A | Post PA |
In Table 2, the post-segment position of the PA (power amplifier), by the transmission frequency, reduces the notch of the reception frequency signal of the other frequency band. Murata has mass-produced traps with a frequency of around 800 MHz from the beginning. This time, it is necessary to productize new 1.8GHz and 1.9GHz high-band products. In general, the higher the frequency, the more difficult the design of the notch is. However, Murata has successfully used its unique circuit design technology and made full use of electromagnetic field simulators to successfully commercialize it.
Table 3: List of products for TD-LTE filters
Size (mm) | Application | Balanced | Impedance | MURATA P/N | Comment |
/Unbalanced | (Ω) | ||||
1.1×0.9×0.5 | N-DCS | Balance | 50-150 | SAFFB1G81AB0F0A | For GSM1800 |
1.1×0.9×0.5 | N-DCS | Balance | 50-150 | SAFFB1G82AB0F0A | For GSM1800 |
1.1×0.9×0.5 | Band38 | Balance | 50-100 | SAFFB2G59FL0F0A | |
1.1×0.9×0.5 | Band39 | Balance | 50-100 | SAFFB1G90FB0F0A | |
1.1×0.9×0.5 | Band39 | Balance | 50-100 | SAFFB1G90FC0F0A | |
1.1×0.9×0.5 | Band40 | Balance | 50-100 | SAFFB2G34FA1F0A | |
1.1×0.9×0.5 | Band40 | Unbalance | 50-50 | SAFFB2G35AA0F0A | |
1.4×1.1×0.5 | AXGP | Unbalance | 50-50 | SAFEA2G56MA0F00 | Post PA |
1.4×1.1×0.5 | AXGP | Unbalance | 50-50 | SAFEA2G56MB0F00 | Post PA |
1.4×1.1×0.5 | AXGP | Unbalance | 50-50 | SAFEA2G56MC0F0A | Post PA |
1.4×1.1×0.5 | AXGP | Unbalance | 50-50 | SAFEA2G56KA0F00 | |
1.4×1.1×0.5 | AXGP | Balance | 50-100 | SAFEA2G56FC0F00 | |
1.4×1.1×0.5 | AXGP | Balance | 50-200 | SAFEA2G56FB0F00 | |
1.4×1.1×0.5 | Band34 | Unbalance | 50-50 | SAFEA2G01MA0F0A | Post PA |
1.4×1.1×0.5 | Band34 | Unbalance | 50-50 | SAFEA2G01AL0F00 | |
1.4×1.1×0.5 | Band34 | Balance | 50-100 | SAFEA2G01FA0F0A | |
1.4×1.1×0.5 | Band34 | Balance | 50-200 | SAFEA2G01FL0F00 | |
1.4×1.1×0.5 | Band38 | Unbalance | 50-50 | SAFEA2G59MA0F00 | Post PA |
1.4×1.1×0.5 | Band38 | Unbalance | 50-50 | SAFEA2G59MB0F0A | Post PA |
1.4×1.1×0.5 | Band38 | Unbalance | 50-50 | SAFEA2G59KB0F00 | |
1.4×1.1×0.5 | Band38 | Balance | 50-100 | SAFEA2G59FM0F0A | |
1.4×1.1×0.5 | Band38 | Balance | 50-150 | SAFEA2G59FL0F00 | |
1.4×1.1×0.5 | Band38+AXGP | Unbalance | 50-50 | SAFEA2G58MA0F00 | Post PA |
1.4×1.1×0.5 | Band38+AXGP | Balance | 50-100 | SAFEA2G58FA0F00 | |
1.4×1.1×0.5 | Band39 | Unbalance | 50-50 | SAFEA1G90MA0F0A | Post PA |
1.4×1.1×0.5 | Band39 | Unbalance | 50-50 | SAFEA1G90AA0F00 | |
1.4×1.1×0.5 | Band39 | Balance | 50-100 | SAFEA1G90FA0F0A | |
1.4×1.1×0.5 | Band40 | Unbalance | 50-50 | SAFEA2G34MA1F0A | Post PA |
1.4×1.1×0.5 | Band40 | Balance | 50-100 | SAFEA2G34FA1F0A | |
1.4×1.1×0.5 | Band40 | Unbalance | 50-50 | SAFEA2G35MB0F00 | Post PA |
1.4×1.1×0.5 | Band40 | Unbalance | 50-50 | SAFEA2G35MC0F0A | Post PA |
1.4×1.1×0.5 | Band40 | Unbalance | 50-50 | SAFEA2G35KB0F00 | |
1.4×1.1×0.5 | Band40 | Balance | 50-100 | SAFEA2G35FC0F0A | |
1.4×1.1×0.5 | Band40 | Balance | 50-150 | SAFEA2G35FB0F00 |
Table 3 is a list of filters. The product written in the Application column for N-DCS is a filter for narrow bandwidth GSM1800. This is a product that takes into account the reduction of the TD-LTE band, and produces two types according to the needs of customers. Not only for China, but also for the production of filters used in the 2.5GHz bandwidth of the unique AXGP used only in Japan, carefully matching the needs of customers, and strengthening the product lineup, shouldering the popularity of TD-LTE worldwide. The burden.
Conclusion
In the existing UMTS and LTE markets, in order to improve quality and expand service coverage, frequency expansion is being carried out. TD-LTE can receive and transmit in the same frequency. It is simpler than FDD-LTE frequency configuration. As a limited and precious asset, the effective use of frequency is expected to become more popular in the future. In addition, in response to multi-band and multi-mode pursuits pursued by the market, the area of ​​the RF portion in assembly has also become a major issue.
In Murata's production, the single-filter and the dual-filter are used to expand the product to reduce the number of components and reduce the RF area. In addition, the purpose is to shorten the comprehensive development cycle of the assembler and strengthen the correspondence to the module products. . Due to the miniaturized construction of the module product, the miniaturization of the built-in SAW filter is an indispensable condition, and the unique construction has succeeded in miniaturizing the die size, and is now being researched for smaller size and thinner. .
In the future, we will promote the integration of customers with multi-layer circuit board technology and module design technology for various needs such as miniaturization, thinning, compounding and low cost of assembly manufacturers, and strengthen the supplier as a comprehensive component supplier. Synergistic product development contributes to the development of the module market.
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