KR20000075244A - Equipment For Reducing Transmision Frequency in Mobile cordless communication terminal - Google Patents

Equipment For Reducing Transmision Frequency in Mobile cordless communication terminal Download PDF

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Publication number
KR20000075244A
KR20000075244A KR1019990019749A KR19990019749A KR20000075244A KR 20000075244 A KR20000075244 A KR 20000075244A KR 1019990019749 A KR1019990019749 A KR 1019990019749A KR 19990019749 A KR19990019749 A KR 19990019749A KR 20000075244 A KR20000075244 A KR 20000075244A
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South Korea
Prior art keywords
signal
frequency
band
saw filter
transmission frequency
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KR1019990019749A
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Korean (ko)
Inventor
이석근
Original Assignee
윤종용
삼성전자 주식회사
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Priority to KR1019990019749A priority Critical patent/KR20000075244A/en
Publication of KR20000075244A publication Critical patent/KR20000075244A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H16/00—Unwinding, paying-out webs
    • B65H16/02—Supporting web roll
    • B65H16/06—Supporting web roll both-ends type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/413—Supporting web roll
    • B65H2301/4134—Both ends type arrangement
    • B65H2301/41346—Both ends type arrangement separate elements engaging each end of the roll (e.g. chuck)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/50—Machine elements
    • B65H2402/51—Joints, e.g. riveted or magnetic joints

Abstract

PURPOSE: A device for attenuating a band of a transmission frequency in a wireless communication terminal, is provided to make a transmission frequency pass two SAW filters serially connecting a 60MHz band signal of a 1810-1910MHz transmission frequency with one channel group without dividing the transmission frequency into two channel groups, to attenuate a frequency bandwidth, so as to prevent interference by duplicated transmission frequency and receiving frequency. CONSTITUTION: A driver(30) amplifies a signal, converted into a high-frequency signal from a mixer, into a predetermined level for outputting. A first SAW filter(32) filters a signal having a 60MHz band of frequency outputted from the driver(30) to attenuate the band, and outputs the filtered signal to a second SAW filter(34). The second SAW filter(34) filters the signal outputted from the first SAW filter to attenuate the band, and outputs the filtered signal to a power amplifier(36). The power amplifier power-amplifies the signal outputted from the second SAW filter, and outputs the amplified signal to an antenna.

Description

무선통신단말기의 송신주파수 대역 감쇄장치{Equipment For Reducing Transmision Frequency in Mobile cordless communication terminal}Equipment For Reducing Transmision Frequency in Mobile cordless communication terminal}

본 발명은 무선통신단말기의 송신주파수 대역 감쇄장치에 관한 것으로, 특히 송신대역과 수신대역의 이격이 작은 부분에서 송신주파수와 수신주파수가 중첩되지 않도록 송신주파수의 대역을 감쇄시키는 장치에 관한 것이다.The present invention relates to an apparatus for attenuating a transmission frequency band of a wireless communication terminal, and more particularly, to an apparatus for attenuating a band of a transmission frequency so that a transmission frequency and a reception frequency do not overlap in a small distance between a transmission band and a reception band.

통상적으로 개인휴대통신방식(PCS:Person Communication Services)에서는 주파수 대역을 1850 ∼1990MHz로 할당하여 사용하고 있다. 이때 송신주파수 대역은 1850∼1910MHz를 사용하고, 수신주파수는 1930∼1990MHz를 사용하고 있기 때문에 송수신 주파수가 각각 60MHz대역으로 되어있다. 60MHz로 송신과 수신을 하게 되면 송신주파수와 수신주파수의 인접주파수 대역에서 중첩되어 상호간섭을 주게 되어 송수신기의 성능열화의 중요한 요인이 되는 문제점이 있다.In general, personal communication services (PCS: Person Communication Services) is used to allocate the frequency band from 1850 to 1990MHz. At this time, since the transmission frequency band is 1850 to 1910 MHz and the reception frequency is 1930 to 1990 MHz, the transmission and reception frequencies are 60 MHz bands, respectively. When transmitting and receiving at 60 MHz, there is a problem in that the transmission frequency and the receiving frequency overlap each other in the adjacent frequency bands, thereby causing interference, which is an important factor in performance degradation of the transceiver.

이러한 문제를 해결하기 위한 송수신주파수 대역 감쇄장치가 도 1에 개시되어 있다. 도 1을 참조하면, 드라이버(10)는 믹서로부터 고주파신호로 변환된 신호를 소정레벨로 증폭하여 출력한다. 이때 대역선택스위치(12)는 콘트롤러로부터 인가되는 제어신호에 의해 상,하 주파수 30MHz를 선택하기 위한 제어신호를 두 개의 제1 및 제2 MUX(14, 18)로 출력한다. 이때 제1 MUX(14)는 드라이버(10)로부터 증폭된 신호를 상기 대역선택스위치(12)의 제어신호에 의해 제1SAW필터와 제2SAW로 인가한다. 그러면 제1 및 제2 SAW필터는 입력된 신호의 낮은 대역 30MHz와 높은대역의 30MHz를 주파수를 각각 통과시킨다. 그러면 제2MUX(18)는 제1 MUX(14)와 연동동작을 하며, 상기 대역선택스위치(12)의 제어신호에 의해 상기 제1 및 제2 SAW필터로부터 통과 출력된 신호를 각각 선택하여 전력증폭기(20)로 인가한다. 상기 전력증폭기(20)는 상기 제2MUX(18)로부터 선택출력된 신호를 전력증폭하여 안테나로 출력한다.Transmitting and receiving frequency band attenuation apparatus for solving this problem is disclosed in FIG. Referring to FIG. 1, the driver 10 amplifies and outputs a signal converted into a high frequency signal from a mixer to a predetermined level. At this time, the band selection switch 12 outputs a control signal for selecting the upper and lower frequencies 30MHz to the two first and second MUXs 14 and 18 by the control signal applied from the controller. At this time, the first MUX 14 applies the signal amplified from the driver 10 to the first SAW filter and the second SAW by the control signal of the band selection switch 12. The first and second SAW filters then pass the frequencies of the low band 30 MHz and the high band 30 MHz of the input signal, respectively. Then, the second MUX 18 interlocks with the first MUX 14 and selects a signal output from the first and second SAW filters by the control signal of the band selection switch 12 to power amplifier. (20). The power amplifier 20 amplifies and outputs the signal selected by the second MUX 18 to the antenna.

이와같이 종래에는 60MHz의 주파수대역을 상,하 30MHz로 구분하여 송신하므로 송신주파수와 수신주파수간에 서로 간섭이 발생하는 것을 방지할 수 있으나, 선택스위치(12)와 제1 및 제2 MUX(14,18)등을 구비하여야 하므로 회로가 복잡하고, 이러한 부품을 실장하여야 하므로 휴대폰등의 실장공간을 많이 차지하여 휴대폰의 크기가 커지는 문제가 있었다.As described above, since a 60 MHz frequency band is divided into 30 MHz up and down and transmitted, interference between the transmission frequency and the reception frequency can be prevented from occurring, but the selection switch 12 and the first and second MUXs 14 and 18 can be prevented. Since the circuit is complicated, and such parts must be mounted, the size of the mobile phone increases due to a large amount of mounting space such as a mobile phone.

따라서 본 발명의 목적은 이동무선통신단말기에서 부피를 줄일 수 있도록 하는 송신주파수 대역감쇄장치를 공함에 있다.Accordingly, an object of the present invention is to provide a transmission frequency band attenuation apparatus for reducing the volume in a mobile wireless communication terminal.

상기 목적을 달성하기 위한 본 발명의 무선통신단말기의 송신주파수 대역 감쇄장치에 있어서, 믹서로부터 고주파신호로 변환된 신호를 소정레벨로 증폭하여 출력하는 드라이버와, 상기 드라이버로부터 출력된 60MHz대역의 주파수를 갖는 신호를 대역이 감쇄되도록 필터링하여 출력하는 제1 SAW필터와, 상기 제1 SAW필터로부터 출력된 신호를 대역이 감쇄되도록 필터링하여 출력하는 제2 SAW필터와, 상기 제2 SAW필터로부터 출력된 신호를 전력증폭하여 안테나로 출력하는 전력증폭기를 포함함을 특징으로한다.In the transmission frequency band attenuation apparatus of the wireless communication terminal of the present invention for achieving the above object, a driver for amplifying and outputting a signal converted into a high frequency signal from the mixer to a predetermined level, and the frequency of the 60MHz band output from the driver A first SAW filter for filtering and outputting a signal having a band attenuated, a second SAW filter for filtering and outputting a signal outputted from the first SAW filter to attenuate a band, and a signal output from the second SAW filter It characterized in that it comprises a power amplifier for amplifying the power output to the antenna.

도 1은 종래의 송수신주파수 대역 감쇄장치의 구성도1 is a block diagram of a conventional transmission and reception frequency band attenuation apparatus

도 2는 본 발명의 실시예에 따른 송신주파수 대역감쇄장치의 구성도2 is a block diagram of a transmission frequency band attenuation apparatus according to an embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 직렬연결된 2개의 제1 및 제2 SAW필터의 출력 특성도3 is an output characteristic diagram of two first and second SAW filters connected in series according to an embodiment of the present invention.

이하 본 발명에 따른 바람직한 실시 예를 첨부한 도면을 참조하여 상세히 설명한다. 우선 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 그리고 본 발명을 설명함에 있어서, 관련된 공지 기능 혹은 구성에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

도 2는 본 발명의 실시예에 따른 송신주파수 대역감쇄장치의 구성도이다.2 is a block diagram of a transmission frequency band attenuation apparatus according to an embodiment of the present invention.

드라이버(30)의 출력단에 제1 SAW필터(32)의 입력단이 연결되고, 상기 제1 SAW필터(32)의 출력단에 제2 SAW필터(34)의 입력단이 연결되며, 상기 제2 SAW필터(34)의 출력단이 전력증폭기(36)의 입력단으로 연결되도록 구성되어 있다.An input terminal of the first SAW filter 32 is connected to an output terminal of the driver 30, an input terminal of the second SAW filter 34 is connected to an output terminal of the first SAW filter 32, and the second SAW filter ( 34) is configured to be connected to the input of the power amplifier 36.

도 3은 본 발명의 실시예에 따른 직렬연결된 2개의 제1 및 제2 SAW필터를 통과하는 필터의 출력 특성도를 나타낸 도면이다.3 is a diagram illustrating an output characteristic diagram of a filter passing through two first and second SAW filters connected in series according to an exemplary embodiment of the present invention.

상술한 도 2 내지 도 3을 참조하여 본 발명의 바람직한 실시예의 동작을 상세히 설명한다.2 to 3, the operation of the preferred embodiment of the present invention will be described in detail.

드라이버(30)는 믹서로부터 고주파신호로 변환된 신호를 소정레벨로 증폭하여 출력한다. 그러면 제1 SAW필터(32)는 드라이버(30)로부터 출력된 도 3의 S1과 같은 60MHz대역의 주파수를 갖는 신호를 필터링 하여 대역을 감쇄시켜 도 3의 S2와 같은 신호를 제2 SAW(34)로 출력한다. 제2 SAW필터(34)는 상기 제1 SAW필터(32)로부터 출력된 신호를 필터링하여 대역을 감쇄시켜 도 3의 S3와 같은 신호를 전력증폭기(36)로 출력한다. 상기 전력증폭기(36)는 상기 제2 SAW필터(34)로부터 출력된 신호를 전력증폭하여 안테나로 출력한다.The driver 30 amplifies and outputs the signal converted into the high frequency signal from the mixer to a predetermined level. Then, the first SAW filter 32 filters a signal having a frequency of 60 MHz band as S1 of FIG. 3 outputted from the driver 30 to attenuate the band, thereby converting a signal such as S2 of FIG. 3 into a second SAW 34. Will output The second SAW filter 34 filters the signal output from the first SAW filter 32 to attenuate the band and outputs a signal such as S3 of FIG. 3 to the power amplifier 36. The power amplifier 36 amplifies the signal output from the second SAW filter 34 and outputs the signal to the antenna.

상술한 바와 같이 본 발명은, 이동무선통신단말기에서 송신주파수를 2개의 채널군으로 구분하지 않고 하나의 채널군으로 송신주파수 1810∼1910MHz의 60MHz대역신호를 직렬연결된 두 개의 SAW필터를 통과시켜 주파수 대역폭을 감쇄시켜 송신주파수가 수신주파와 중첩에 의한 간섭을 방지하므로, 회로를 단순화하여 원가를 절감할 수 있는 동시에 실장공간을 축소시켜 휴대폰의 크기를 줄일 수 있다.As described above, in the present invention, the mobile radio communication terminal does not divide the transmission frequency into two channel groups, but passes through two SAW filters connected in series with a 60 MHz band signal having a transmission frequency of 1810 to 1910 MHz in one channel group. Since the transmission frequency prevents interference due to overlapping with the reception frequency by reducing the frequency, the circuit can be simplified and the cost can be reduced, and the mounting space can be reduced to reduce the size of the mobile phone.

Claims (1)

무선통신단말기의 송신주파수 대역 감쇄장치에 있어서,In the transmission frequency band attenuation apparatus of the wireless communication terminal, 믹서로부터 고주파신호로 변환된 신호를 소정레벨로 증폭하여 출력하는 드라이버와,A driver for amplifying and outputting a signal converted into a high frequency signal from a mixer to a predetermined level; 상기 드라이버로부터 출력된 60MHz대역의 주파수를 갖는 신호를 대역이 감쇄되도록 필터링하여 출력하는 제1 SAW필터와,A first SAW filter which filters and outputs a signal having a frequency of 60 MHz band outputted from the driver so that the band is attenuated; 상기 제1 SAW필터로부터 출력된 신호를 대역이 감쇄되도록 필터링하여 출력하는 제2 SAW필터와,A second SAW filter for filtering and outputting a signal outputted from the first SAW filter so that a band is attenuated; 상기 제2 SAW필터로부터 출력된 신호를 전력증폭하여 안테나로 출력하는 전력증폭기를 포함함을 특징으로 하는 무선통신단말기의 송신주파수 대역 감쇄장치.And a power amplifier for amplifying the signal output from the second SAW filter and outputting the signal to an antenna.
KR1019990019749A 1999-05-31 1999-05-31 Equipment For Reducing Transmision Frequency in Mobile cordless communication terminal KR20000075244A (en)

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