KR20040100148A - Amplifier for triple band mobile communication device - Google Patents

Amplifier for triple band mobile communication device Download PDF

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Publication number
KR20040100148A
KR20040100148A KR1020030032369A KR20030032369A KR20040100148A KR 20040100148 A KR20040100148 A KR 20040100148A KR 1020030032369 A KR1020030032369 A KR 1020030032369A KR 20030032369 A KR20030032369 A KR 20030032369A KR 20040100148 A KR20040100148 A KR 20040100148A
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amplifier
dcs
wcdma
power amplifier
mobile communication
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KR1020030032369A
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KR100524754B1 (en
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이종복
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엘지전자 주식회사
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
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    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/8409—Sound-absorbing elements sheet-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/38—Meshes, lattices or nets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Amplifiers (AREA)
  • Transceivers (AREA)

Abstract

PURPOSE: An amplifier of a triple-band mobile terminal is provided to solve a problem of the increase in the size and a fabrication unit cost of a terminal in case of having two power amplifier in one terminal. CONSTITUTION: Signals of three bands and a control signal for discriminating them are outputted through a main RF processing IC(100). A triple-band integrated power amplifier(200) performs three-stage amplifying of GSM, DCS and WCDMA. At the first and second stages(Amp4,Amp5), TXs of the DCS and WCDMA have the almost same frequencies and low outputs, so the amplifiers(Amp4, Amp5) are commonly used. At the final third stage, the maximum power of the DCS is 30dBm and the maximum power of the WCDMA is 24dBm. Thus, because the power classes and signal modulation methods are different, different amplifiers(Amp6,Amp7) are used. A switch(SW1) is installed inside the power amplifier(200) to switch to the DCS or to the WCDMA according to the control signal outputted from the main RF processing IC(100). A transmission signal which has been outputted from the power amplifier(200) is outputted to an antenna through a switchplexer(300) and operated in TDD, so when a signal is received from the antenna, it is switched to an LNA(Low-Noise Amplifier).

Description

삼중 밴드 이동 통신 단말기의 증폭기{AMPLIFIER FOR TRIPLE BAND MOBILE COMMUNICATION DEVICE}AMPLIFIER FOR TRIPLE BAND MOBILE COMMUNICATION DEVICE}

본 발명은 삼중 밴드 이동 통신 단말기의 증폭기에 관한 것으로, 특히 UMTS와 GSM, DCS(PCS) 3개 주파수 밴드를 포함하는 이동 통신 단말기에서, DCS와 W-CDMA 증폭기를 하나로 통합함으로써, 단말기의 크기와 제조 단가를 낮출 수 있도록 하는 삼중 밴드 이동 통신 단말기의 증폭기에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplifier of a three-band mobile communication terminal. In particular, in a mobile communication terminal including three frequency bands of UMTS, GSM, and DCS (PCS), the size and size of the terminal are integrated by integrating the DCS and the W-CDMA amplifier into one. The present invention relates to an amplifier of a triple band mobile communication terminal capable of lowering the manufacturing cost.

참고로, UMTS는 유럽 전기통신 표준협회(ETSI)가 추진중인 비동기 방식인 W-CDMA를 기반으로 하는 모든 이동 통신을 결합하는 21세기 범용 이동 통신 시스템을 의미하며, DCS(PCS)는 RF 채널 수의 증대를 통해 1900MHz 대역에서의 작동하는 규격이고, GSM은 디지털 이동전화를 위한 범유럽 표준으로서 TDMA를 기반으로 개발된 세계에서 가장 널리 사용되는 이동시스템이다.For reference, UMTS refers to a 21st century general purpose mobile communication system that combines all mobile communication based on W-CDMA, an asynchronous method promoted by the European Telecommunication Standards Association (ETSI), and DCS (PCS) is the number of RF channels. By increasing the number of bands operating in the 1900 MHz band, GSM is the world's most widely used mobile system developed based on TDMA as a pan-European standard for digital mobile phones.

참고로, W-CDMA는 주파수 할당에 따라 주파수 분할 다중(FDD) 및 시분할 다중(TDD)을 사용하는 3세대 무선 인터페이스로서, TDD는 프레임 주기의 일부동안 순방향링크를 작동하도록 하고 프레임 주기의 나머지 동안 역방향 링크 작동이 가능하도록 무선 채널을 시간적으로 분할하는 듀플렉싱 기법을 의미한다.For reference, W-CDMA is a third-generation air interface that uses frequency division multiplexing (FDD) and time division multiplexing (TDD) depending on frequency allocation. TDD allows the forward link to operate for a portion of the frame period and for the remainder of the frame period. A duplexing technique that divides a wireless channel in time to enable reverse link operation.

도1은 종래의 듀얼모드 타입 단말기의 내부 증폭부 구성을 보인 블록도로서, 이에 도시된 바와 같이 듀얼 모드(Dual Mode)(FDD UMTS+GSM) 단말기에서, W-CDMA의 경우 TX와 RX가 같은 시간에 사용되므로 듀플렉서(Duplexer, 10)가 필요한 반면, PAM(Power Amplifier)의 경우 GSM, DCS의 TDD 방식과 WCDMA의 FDD방식이 달라 PAM을 하나의 모듈에 공용화 할 수 없기 때문에, 단말기의 사이즈가 커지는 문제점이 있다.FIG. 1 is a block diagram illustrating an internal amplification unit of a conventional dual mode type terminal. As shown in FIG. 1, in a dual mode (FDD UMTS + GSM) terminal, TX and RX are the same in the case of W-CDMA. Duplexer (10) is needed because it is used for time, whereas PAM (Power Amplifier) cannot use PAM in one module because TDD method of GSM, DCS and FDD method of WCDMA are different. There is a growing problem.

다시 말해, 현재의 UMTS(W-CDMA) 서비스는 FDD 방식으로 말미암아, 도1에 도시된 바와 같이 하나의 단말기에 두 개의 전력 증폭기(PAM1, PAM2)를 구비해야 하고, UMTS의 경우 듀플렉서를 추가로 구비해야 하기 때문에, 단말기의 크기가 커지고 제작 단가가 상승하게 되는 문제점이 있다.In other words, the current UMTS (W-CDMA) service is provided by the FDD scheme, and as shown in FIG. 1, two power amplifiers (PAM1 and PAM2) must be provided in one terminal, and in the case of UMTS, a duplexer is additionally added. Since it must be provided, there is a problem that the size of the terminal is increased and the manufacturing cost increases.

따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 창출한 것으로, UMTS와 GSM, DCS(PCS) 3개 주파수 밴드를 포함하는 이동 통신 단말기에서, DCS와 WCDMA 증폭기를 하나로 통합함으로써, 단말기의 크기와 제조 단가를 낮출 수있도록 하는 삼중 밴드 이동 통신 단말기의 증폭기를 제공함에 그 목적이 있다.Accordingly, the present invention has been made to solve the above-mentioned problems, and in a mobile communication terminal including three frequency bands of UMTS, GSM, and DCS (PCS), by integrating the DCS and WCDMA amplifier into one, An object of the present invention is to provide an amplifier of a three-band mobile communication terminal capable of reducing size and manufacturing cost.

이와 같은 목적을 달성하기 위한 본 발명은, 삼중 밴드(UMTS, GSM, DCS) 이동 통신 단말기의 증폭기에 있어서, 3단의 증폭수단으로 이루어지는 전력 증폭기의 처음 1,2단을 DCS와 WCDMA 밴드에서 공동으로 사용하게 하고, 최종 3단은 두 밴드의 신호 변조 방식과 파워 클래스가 다르므로, 별도의 증폭수단을 포함하여 구성하고, 밴드의 종류에 따라 최종 3단의 증폭수단을 선택적으로 스위칭 하는 스위치를 포함하여 구성한 것을 특징으로 한다.The present invention for achieving the above object, in the amplifier of a three-band (UMTS, GSM, DCS) mobile communication terminal, the first and second stages of the power amplifier consisting of three stages of amplification means in the DCS and WCDMA band Since the final three stages are different in signal modulation scheme and power class of the two bands, a separate amplification means is included and a switch for selectively switching the final three stage amplification means according to the type of band is used. It is characterized by including the configuration.

도 1은 종래의 듀얼모드 타입 단말기의 내부 증폭부 구성을 보인 블록도.1 is a block diagram showing the configuration of the internal amplification unit of a conventional dual mode terminal.

도 2는 본 발명에 의한 이동 통신 단말기의 증폭기 구성을 보인 블록도.2 is a block diagram showing an amplifier configuration of a mobile communication terminal according to the present invention;

*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

100 : 메인 RF 처리 IC 200 : 삼중 밴드 통합 전력 증폭기100: main RF processing IC 200: triple band integrated power amplifier

300 : 스위치 플렉서 SW1 : 스위치300: switch flexure SW1: switch

일반적으로, 이동 통신 단말기의 전력 증폭기는 3단 증폭을 하게 되는데, 본 발명에서는 DCS와 W-CDMA가 거의 동일한 주파수대를 사용하는 것을 이용하여, 2단 증폭까지는 공동으로 사용하고, 3단 증폭은 파워 클래스(Power class)가 서로 다르므로 다른 증폭기를 사용하게 하고, 스위칭에 의해 마지막 3단 증폭기를 선택하게 하는 전력 증폭기를 구비함으로써, 두 개의 전력 증폭기를 하나로 줄일 수 있도록 하여, 단말기의 크기를 줄이고 제조 단가를 절감할 수 있도록 하는 특징이 있다.In general, a power amplifier of a mobile communication terminal performs three-stage amplification. In the present invention, DCS and W-CDMA use almost the same frequency band, so that two-stage amplification is jointly used, and three-stage amplification is power. Since the power class is different, it is possible to use a different amplifier and to have a power amplifier that selects the last three stage amplifier by switching, so that two power amplifiers can be reduced to one, thereby reducing the size of the terminal and manufacturing. There is a feature to reduce the unit cost.

즉, 본 발명은 UMTS를 현재의 FDD 방식에서 TDD 방식으로 전환할 경우, GSM과 W-CDMA의 전력 증폭기(PAM1, PAM2)를 하나로 통합함과 아울러 듀플렉서를 제거할 수 있게되어, 단말기의 크기를 줄이고 제조 단가를 절감할 수 있도록 하는 특징이 있는 것이다.That is, when the UMTS is converted from the current FDD scheme to the TDD scheme, the present invention can integrate the power amplifiers (PAM1 and PAM2) of GSM and W-CDMA into one and eliminate the duplexer, thereby reducing the size of the terminal. There is a feature that allows to reduce the manufacturing cost.

이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described.

도2는 본 발명에 의한 이동 통신 단말기의 증폭기 구성을 보인 블록도로서, GSM과 DCS, WCDMA의 삼중 밴드를 모두 증폭할 수 있는 하나의 전력 증폭기를 구비하고 있다.2 is a block diagram showing an amplifier configuration of a mobile communication terminal according to the present invention, and has one power amplifier capable of amplifying all three bands of GSM, DCS, and WCDMA.

도2를 참조하면, 메인 RF 처리 IC(100)를 통해 3개 대역의 신호(GSM, DCS, WCDMA)와 이를 구별하는 제어신호(Control Signal)가 출력되도록 구성되어 있다. 물론, 메인 RF 처리 IC(100)의 구조는 단말기 제조업체에 따라 달라질 수 있다.Referring to FIG. 2, a signal of three bands (GSM, DCS, WCDMA) and a control signal distinguishing the same are output through the main RF processing IC 100. Of course, the structure of the main RF processing IC 100 may vary depending on the terminal manufacturer.

다음 삼중 밴드 통합 전력 증폭기(200)는 GSM, DCS, WCDMA 모두 3단 증폭을 하도록 구성되는데, 1,2단(Amp4, Amp5)은 DCS, WCDMA의 TX가 거의 같은 주파수이고 출력도 낮아 공동으로 사용하도록 하고, 마지막 3단은 안테나 출력 기준으로 DCS의 최대 파워(max power)가 30dBm이고, WCDMA의 최대 파워(max power)가 24dBm으로서, 파워 클래스가 다르고 신호 변조(Signal Modulation) 방식도 다르므로, 별도의 증폭기(Amp6, Amp7)를 사용한다.Next, the tri-band integrated power amplifier 200 is configured to amplify all three stages of GSM, DCS, and WCDMA, and the first and second stages (Amp4 and Amp5) are commonly used at the same frequency as the DCS and WCDMA. In the last three stages, the maximum power of the DCS is 30dBm and the maximum power of the WCDMA is 24dBm based on the antenna output.The power class is different and the signal modulation method is different. Use separate amplifiers (Amp6, Amp7).

따라서, 전력 증폭기(200) 내부에 스위치(SW1)를 장착하여, 메인 RF 처리 IC(100)에서 출력하는 제어신호에 의해 DCS 또는 WCDMA로 스위치 해 준다. 이로써, 전력 증폭기(200)는 GSM, DCS, WCDMA 3개 신호에 대해 증폭된 신호를 출력하게 된다.Therefore, the switch SW1 is mounted inside the power amplifier 200 and switched to DCS or WCDMA by a control signal output from the main RF processing IC 100. As a result, the power amplifier 200 outputs an amplified signal for three signals of GSM, DCS, and WCDMA.

그리고, 상기 전력 증폭기(200)에서 출력한 송신 신호는 스위치 플렉서(Switchplexer, 300)를 통해 안테나로 출력되고, TDD 방식으로 동작하므로 안테나로부터 신호가 수신되면 저잡음 증폭기(LNA, 미도시)로 스위칭하게 된다.In addition, since the transmission signal output from the power amplifier 200 is output to an antenna through a switchplexer 300 and operates in a TDD scheme, when a signal is received from the antenna, the transmission signal is switched to a low noise amplifier (LNA, not shown). Done.

이상에서 설명한 바와 같이 본 발명 삼중 밴드 이동 통신 단말기의 증폭기는, UMTS와 GSM, DCS(PCS) 3개 주파수 밴드를 포함하는 이동 통신 단말기에서, DCS와 W-CDMA 증폭기를 하나로 통합함으로써, 단말기의 크기와 제조 단가를 낮출 수 있도록 하는 효과가 있다.As described above, the amplifier of the tri-band mobile communication terminal of the present invention integrates a DCS and a W-CDMA amplifier in a mobile communication terminal including three frequency bands of UMTS, GSM, and DCS (PCS). And it is effective to lower the manufacturing cost.

Claims (2)

삼중 밴드(WCDMA, GSM, DCS) 이동 통신 단말기의 증폭기에 있어서,In the amplifier of a three-band (WCDMA, GSM, DCS) mobile communication terminal, 3단의 증폭수단으로 이루어지는 전력 증폭기의 처음 1,2단을 DCS와 WCDMA 밴드에서 공동으로 사용하게 하고,First and second stages of the power amplifier consisting of three stages of amplification means are used jointly in the DCS and WCDMA bands, 최종 3단은 상기 두 밴드의 신호 변조 방식과 파워 클래스가 다르므로, 별도의 증폭수단으로 각기 구성하고,Since the final three stages are different from the signal modulation scheme and power class of the two bands, they are respectively configured by separate amplification means. 사용할 밴드의 종류에 따라 최종 3단의 증폭수단을 선택적으로 스위칭 하는 스위치를 포함하여 구성한 것을 특징으로 하는 삼중 밴드 이동 통신 단말기의 증폭기.An amplifier of a three-band mobile communication terminal comprising a switch for selectively switching the final three stage amplification means according to the type of band to be used. 제1항에 있어서, 상기 전력 증폭기의 GSM 밴드를 위한 증폭수단은 DCS와 WCDMA 밴드와 다른 별도의 3단 증폭수단으로 구성하는 것을 특징으로 하는 삼중 밴드 이동 통신 단말기의 증폭기.2. The amplifier of claim 1, wherein the amplifying means for the GSM band of the power amplifier comprises three separate amplifying means different from the DCS and WCDMA bands.
KR10-2003-0032369A 2003-05-21 2003-05-21 Amplifier for triple band mobile communication device KR100524754B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100118840A (en) * 2009-04-29 2010-11-08 엘지이노텍 주식회사 Transmitting/receiving device for mobile phone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100118840A (en) * 2009-04-29 2010-11-08 엘지이노텍 주식회사 Transmitting/receiving device for mobile phone

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