KR20010059939A - Mobile station for mobile communication system - Google Patents

Mobile station for mobile communication system Download PDF

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KR20010059939A
KR20010059939A KR1019990067480A KR19990067480A KR20010059939A KR 20010059939 A KR20010059939 A KR 20010059939A KR 1019990067480 A KR1019990067480 A KR 1019990067480A KR 19990067480 A KR19990067480 A KR 19990067480A KR 20010059939 A KR20010059939 A KR 20010059939A
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signal
frequency
low pass
filter
output
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KR1019990067480A
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KR100653515B1 (en
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백형일
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송문섭
주식회사 현대큐리텔
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1783—Combined LC in series path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/14—WLL [Wireless Local Loop]; RLL [Radio Local Loop]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE: A terminal for a mobile communication system is provided so that transmission spurious property can be improved by removing 8.192MHz clock noise of a baseband, by adding IQ low band filters to a preceding terminal of an QPSK modulator. CONSTITUTION: A low band filter(101) removes 8.192MHz frequency from a baseband signal processor by filtering an IF baseband signal. A QPSK modulator(102) modulates the baseband signal from the low band filter(101). An LC band filter(103) passes a necessary frequency band by filtering the intermediate frequency from the QPSK modulator(102). An auto gain controller(104) controls a gain of the transmission signal. A frequency up converter(105) converts the transmission signal from the auto gain controller(104) to a radio frequency. A radio frequency band filter(106) filters the radio frequency from the frequency up converter(105) to a predetermined band. A pre-amplifier(107) amplifies the output signal from the radio frequency band filter(106). A drive amplifier(108) amplifies the output signal from the pre-amplifier(107) to a predetermined level. A final amplifier(109) amplifies the output signal from the drive amplifier(108) As the result, transmission spurious property is improved without requiring a saw filter. In addition, current consumption of the amplifiers can be remarkably reduced by removing the loss of the transmission signal.

Description

이동통신 시스템의 단말기{Mobile station for mobile communication system}Mobile terminal for mobile communication system

본 발명은 CDMA 방식을 적용한 이동 통신 시스템(PCS, DCS, W-CDMA WLL)에서 단말기에 관한 것으로, 특히 기존에 필수적으로 사용되던 쏘 필터(SAW Filter)를 사용하지 않고서도 송신 스푸리어스(Spurious) 특성을 개선토록 한 이동 통신 시스템의 단말기에 관한 것이다.The present invention relates to a terminal in a mobile communication system (PCS, DCS, W-CDMA WLL) to which the CDMA method is applied. In particular, the present invention relates to a transmission spurious without using a SAW filter. It relates to a terminal of a mobile communication system to improve the characteristics.

좀 더 상세하게는, 송신신호(I,Q) 입력단에 저역 필터(LPF)를 추가하여 기저대역의 8.192MHz 체배 클럭 노이즈를 제거함으로써 송신 스푸리어스 특성이 개선되도록 하고, 기존의 송신 중간주파수 쏘 필터 대신에 Lumped LC BPF를 사용함으로써 송신 신호의 손실을 줄여 증폭기의 전류소모를 절감토록 한 이동 통신 시스템의 단말기에 관한 것이다.More specifically, a low pass filter (LPF) is added to the input signal (I, Q) input stages to remove baseband 8.192 MHz multiplied clock noise to improve the transmission spurious characteristics, and to improve the transmission transmission frequency. By using Lumped LC BPF instead of filter, it is related to the terminal of mobile communication system to reduce the loss of transmit signal and reduce the current consumption of amplifier.

일반적으로, 이동 통신 시스템에 사용되는 단말기는, 송신 기저 대역 신호인 I,Q 파형을 별도의 처리없이 중간주파수 QPSK 변조기로 입력시켜, QPSK 신호로 변조하였다. 이것은 기저대역(Baseband)으로 입력되는 송신신호는 양호한 특성을 갖고 있다고 가정했기 때문이다. 그러나 실제로 기저대역에서 CDMA 신호를 생성하기 위해 사용한 8.192MHz의 체배 주파수가 신호와 함께 IF단으로 입력되므로, RF 안테나 출력단에서의 파형에는 8.192MHz의 체배 주파수 스푸리어스가 발생한다. 따라서이러한 송신 스푸리어스를 제거하기 위해서 종래에는 고가이면서 부피가 큰 RF 유전체 공진기 필터와 IF SAW 필터를 사용하였다.In general, a terminal used in a mobile communication system inputs an I, Q waveform, which is a transmission baseband signal, to an intermediate frequency QPSK modulator without further processing, and modulates it into a QPSK signal. This is because it is assumed that the transmission signal input to the baseband has good characteristics. However, in fact, the multiplication frequency of 8.192MHz used to generate the CDMA signal in the baseband is input to the IF stage together with the signal, resulting in 8.192MHz multiplication frequency spurious on the waveform at the RF antenna output stage. Therefore, in order to eliminate such transmission spurs, an expensive and bulky RF dielectric resonator filter and an IF SAW filter have been conventionally used.

첨부한 도면 도 1은 상기와 같은 RF 유전체 공진 필터와 IF SAW 필터를 사용한 종래 이동통신 시스템에서 단말기의 송신단 구성을 보인 도면이다.1 is a diagram illustrating a configuration of a transmitting terminal of a terminal in a conventional mobile communication system using the RF dielectric resonant filter and the IF SAW filter.

도시된 바와 같이, IF 기저대역 신호(I,Q)를 QPSK 변조하고 변조된 중간주파수를 출력하는 QPSK 변조기(1)와, 상기 QPSK 변조기(1)에서 출력된 중간주파수(IF)를 필터링하여 필요한 주파수 대역만을 통과시키는 중간주파수 SAW 필터(2)와, 상기 중간주파수 SAW 필터(2)를 통한 송신 신호의 이득을 제어하는 자동 이득 제어부(3)와, 상기 자동 이득 제어부(3)에서 출력되는 송신 신호를 고주파수로 상향 변환하는 주파수 상향 변환기(4)와, 상기 주파수 상향 변환기(4)에서 출력되는 고주파를 설정 대역으로 필터링하는 제 1 대역 필터(5)와, 상기 제 1 대역 필터(5)에서 출력되는 신호를 전치 증폭하는 전치 증폭기(6)와, 상기 전치 증폭기(6)의 출력 신호를 대역 필터링하는 제 2 대역 필터(7)와, 상기 제 2 대역 필터(7)의 출력신호를 소정 레벨로 증폭하는 드라이브 증폭기(8)와, 상기 드라이브 증폭기(8)의 출력 신호를 최종적으로 증폭하여 출력하는 최종 증폭기(9)로 구성되었다.As shown, a QPSK modulator 1 for QPSK-modulating IF baseband signals I and Q and outputting a modulated intermediate frequency and an intermediate frequency IF output from the QPSK modulator 1 are required to be filtered. An intermediate frequency SAW filter 2 for passing only a frequency band, an automatic gain control unit 3 for controlling a gain of a transmission signal through the intermediate frequency SAW filter 2, and a transmission output from the automatic gain control unit 3; A frequency upconverter 4 for up-converting the signal to a high frequency, a first band filter 5 for filtering a high frequency output from the frequency upconverter 4 into a set band, and the first band filter 5 A pre-amplifier 6 for preamplifying the output signal, a second band filter 7 for band filtering the output signal of the preamplifier 6, and an output signal of the second band filter 7 at a predetermined level. A drive amplifier 8 for amplifying with It consists of a final amplifier (9) for finally amplifying and outputting the output signal of the drive amplifier (8).

이와 같이 구성된 종래 이동통신 시스템에서 사용되는 단말기의 송신단 장치는, 먼저 QPSK 변조기(1)에서 기저 대역 신호 처리부에서 전송된 직교성분의 IF 기저대역 신호(I,Q)를 QPSK 변조한다. 즉, 상기 기저대역 신호처리부에서는 IF PLL 신디사이저(Synthesizer)로부터 140MHz를 공급 받아 위상 쉬프터를 이용하여 위상이 0°인 로컬 신호와 위상이 90°인 로컬 신호를 만든다. 이렇게 만들어진 각각의로컬 신호는 상기 QPSK 변조기(1)로 입력되며, QPSK 변조기(1)는 내부의 In-Phase 변조기와 Quadrature Phase 변조기로 각각 QPSK 변조를 하게 되고, 이렇게 변조된 IF 신호는 후단의 중간주파수 SAW 필터(2)에 전달된다.The transmitting end device of the terminal used in the conventional mobile communication system configured as described above QPSK modulates the IF baseband signals (I, Q) of quadrature components transmitted from the baseband signal processing unit by the QPSK modulator (1). That is, the baseband signal processor receives 140 MHz from an IF PLL synthesizer to generate a local signal having a phase of 0 ° and a local signal having a phase of 90 ° using a phase shifter. Each local signal thus produced is input to the QPSK modulator 1, and the QPSK modulator 1 performs QPSK modulation with an internal In-Phase modulator and a quadrature phase modulator, respectively. Passed to frequency SAW filter (2).

상기 중간주파수 SAW 필터(2)는 상기 QPSK 변조기(1)에서 출력된 중간주파수(IF)에서 송신 IF 신호는 통과시키고, 불요대역 신호는 차단한다. 즉, 필터링을 통해 필요한 주파수 대역(예를 들어, 140MHz)만을 통과시킨다.The intermediate frequency SAW filter 2 passes the transmission IF signal at the intermediate frequency IF output from the QPSK modulator 1 and blocks the unnecessary band signal. That is, only the required frequency band (for example, 140MHz) passes through the filtering.

자동 이득 제어부(3)는 역방향 링크에서 전력제어를 수행하기 위해서 기지국으로부터 전송된 전력 제어 정보 및 수신레벨에 따른 RSSI 값의 변동을 합하여 그 결과치를 이용하여 상기 중간주파수 SAW 필터(2)를 통한 송신 신호의 이득을 제어한다.The automatic gain control unit 3 transmits through the intermediate frequency SAW filter 2 using the result of adding the variation of the RSSI value according to the reception level and the power control information transmitted from the base station to perform power control on the reverse link. Control the gain of the signal.

그리고 주파수 상향 변환기(4)는 상기 자동 이득 제어부(3)에서 출력되는 송신 신호를 고주파수(RF)로 상향 변환한다. 여기서 주파수 상향 변환기(4)는 PLL 신디사이저로부터 2455MHz의 로컬 주파수를 공급 받는다.The frequency up-converter 4 up-converts the transmission signal output from the automatic gain control unit 3 to a high frequency RF. Here, the frequency upconverter 4 is supplied with a local frequency of 2455 MHz from the PLL synthesizer.

아울러 제 1 대역 필터(5)는 상기 주파수 상향 변환기(4)에서 출력되는 고주파를 설정 대역(2315MHz)으로 필터링한다.In addition, the first band filter 5 filters the high frequency output from the frequency up-converter 4 to a set band (2315 MHz).

아울러 전치 증폭기(6)는 경로 손실을 보상하기 위해서 상기 제 1 대역 필터(5)에서 출력되는 신호를 전치 증폭하게 되고, 제 2 대역 필터(7)는 상기 전치 증폭기(6)의 출력 신호를 대역 필터링한다. 여기서, 제 2 대역 필터(7)는 고가이면서 부피가 큰 RF 유전체 공진기 필터를 사용한다.In addition, the preamplifier 6 pre-amplifies the signal output from the first band filter 5 to compensate for the path loss, and the second band filter 7 bands the output signal of the preamplifier 6. To filter. Here, the second band filter 7 uses an expensive and bulky RF dielectric resonator filter.

그리고 드라이브 증폭기(8)는 상기 제 2 대역 필터(7)의 출력신호를 소정 레벨로 증폭하게 되고, 최종 증폭기(9)는 상기 드라이브 증폭기(8)의 출력 신호를 최종적으로 증폭하여 송신 주파수로 출력한다.The drive amplifier 8 amplifies the output signal of the second band filter 7 to a predetermined level, and the final amplifier 9 finally amplifies the output signal of the drive amplifier 8 and outputs it at a transmission frequency. do.

그러나 이러한 종래의 이동통신 단말기는, 베이스밴드 처리부에서 CDMA 신호를 생성하기 위해 사용한 8.192MHz의 체배 주파수가 신호와 함께 송신단에 입력되어 송신 스푸리어스가 발생되며, 이것을 제거하기 위해서 고가이면서 부피가 큰 RF 유전체 공진기 필터와 중간주파수 SAW 필터를 사용하므로써, 장치의 사이즈가 커지고 생산 단가가 높아지는 단점을 유발하였다.However, in such a conventional mobile communication terminal, a multiplication frequency of 8.192 MHz used for generating a CDMA signal by the baseband processor is input to the transmitter together with a signal to generate a transmission spurious, which is expensive and bulky to eliminate this. The use of an RF dielectric resonator filter and an intermediate frequency SAW filter has led to the disadvantage of larger device size and higher production cost.

또한, 경로 손실을 보상하기 위해서 증폭기에서 그 증폭도를 높임으로써 전력 소모가 커지는 단점도 있었다.In addition, the power consumption is increased by increasing the amplification degree in the amplifier to compensate for the path loss.

따라서 본 발명은 상기와 같은 종래 이동통신 단말기에서 발생하는 제반 문제점을 해결하기 위해서 제안된 것으로서,Accordingly, the present invention has been proposed to solve various problems occurring in the conventional mobile communication terminal as described above.

본 발명의 목적은, 기존에 필수적으로 사용되던 쏘 필터(SAW Filter)를 사용하지 않고서도 송신 스푸리어스(Spurious) 특성을 개선토록 한 이동 통신 시스템의 단말기를 제공하는 데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal of a mobile communication system that improves transmission spurious characteristics without using a SAW filter, which is essentially used.

좀 더 상세하게는, 송신신호(I,Q) 입력단에 저역 필터(LPF)를 추가하여 기저대역의 8.192MHz 체배 클럭 노이즈를 제거함으로써 송신 스푸리어스 특성이 개선되도록 하고, 기존의 송신 중간주파수 쏘 필터 대신에 Lumped LC BPF를 사용함으로써 송신 신호의 손실을 줄여 증폭기의 전류소모를 절감토록 한 이동 통신 시스템의 단말기를 제공하는 데 있다.More specifically, a low pass filter (LPF) is added to the input signal (I, Q) input stages to remove baseband 8.192 MHz multiplied clock noise to improve the transmission spurious characteristics, and to improve the transmission transmission frequency. The use of Lumped LC BPFs instead of filters provides a handset for mobile communication systems that reduces the loss of transmit signals and reduces amplifier current consumption.

상기와 같은 목적을 달성하기 위한 본 발명은,The present invention for achieving the above object,

기저대역 신호 처리부에서 처리된 IF 기저대역 신호를 QPSK 변조하고, 고주파수로 상향 변환한 후 증폭하여 출력하는 이동통신 단말기에 있어서,In the mobile communication terminal for performing QPSK modulation of the IF baseband signal processed by the baseband signal processor, up-converting to a high frequency, and amplifying and outputting the same;

상기 IF 기저대역 신호를 저역 필터링하여 상기 기저대역 신호 처리부에서 부가한 8.192MHz의 체배 주파수를 제거하는 저역 필터부와;A low pass filter for low frequency filtering the IF baseband signal to remove a multiplication frequency of 8.192 MHz added by the baseband signal processor;

상기 저역 필터부에서 필터링된 기저대역 신호를 QPSK 변조하는 QPSK 변조기와;A QPSK modulator for QPSK modulating the baseband signal filtered by the low pass filter;

상기 QPSK 변조기에서 출력된 중간주파수(IF)를 대역 필터링하여 필요한 주파수 대역만을 통과시키는 LC 대역 필터와;An LC band filter for band filtering the intermediate frequency IF output from the QPSK modulator and passing only a required frequency band;

상기 LC 대역 필터를 통한 송신 신호의 이득을 제어하는 자동 이득 제어부와;An automatic gain control unit controlling a gain of a transmission signal through the LC band filter;

상기 자동 이득 제어부에서 출력되는 송신 신호를 고주파수로 상향 변환하는 주파수 상향 변환기와;A frequency upconverter for upconverting the transmission signal output from the automatic gain control unit to a high frequency;

상기 주파수 상향 변환기에서 출력되는 고주파를 설정 대역으로 필터링하는 고주파 대역 필터와;A high frequency band filter for filtering a high frequency output from the frequency up-converter into a set band;

상기 고주파 대역 필터에서 출력되는 신호를 전치 증폭하는 전치 증폭기와;A preamplifier for preamplifying the signal output from the high frequency band filter;

상기 전치 증폭기의 출력 신호를 소정 레벨로 증폭하는 드라이브 증폭기와;A drive amplifier for amplifying the output signal of the preamplifier to a predetermined level;

상기 드라이브 증폭기의 출력 신호를 최종적으로 증폭하여 송신 신호로 출력하는 최종 증폭기로 구성됨을 특징으로 한다.And a final amplifier for finally amplifying the output signal of the drive amplifier and outputting it as a transmission signal.

도 1은 종래 이동통신 시스템에서 단말기의 송신단 구성을 보인 블록도이고,1 is a block diagram showing the configuration of a transmitting end of a terminal in a conventional mobile communication system,

도 2는 본 발명에 따른 이동통신 시스템에서 단말기의 송신단 구성을 보인 블록도이고,2 is a block diagram showing the configuration of a transmitting end of a terminal in a mobile communication system according to the present invention;

도 3은 도 2의 저역 필터의 일 실시예를 보인 회로도이고,3 is a circuit diagram illustrating an example of the low pass filter of FIG. 2;

도 4는 도 2의 LC 필터의 일 실시예를 보인 회로도이고,4 is a circuit diagram showing an embodiment of the LC filter of FIG.

도 5는 도 4에 도시된 LC 필터의 특성 곡선도이고,FIG. 5 is a characteristic curve diagram of the LC filter shown in FIG. 4;

도 6은 본 발명에서 적용한 저역 필터의 특성을 설명하기 위한 RF 출력 스펙트럼으로써, 도 6a는 송신신호 입력단에 저역 필터를 사용하지 않을 경우의 RF 출력 스펙트럼이고, 도 6b는 송신신호 입력단에 저역 필터를 사용한 경우의 RF 출력 스펙트럼이다.FIG. 6 is an RF output spectrum for explaining the characteristics of the low pass filter applied in the present invention. FIG. 6A is an RF output spectrum when a low pass filter is not used at a transmission signal input. FIG. 6B is a low pass filter at a transmission signal input. RF output spectrum when used.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

101 : 저역 필터부101: low pass filter

101a, 101b : 저역 필터101a, 101b: low pass filter

102 : QPSK 변조기102: QPSK Modulator

103 : LC 저역 필터103: LC low pass filter

106 : 고주파 대역 필터106: high frequency band filter

이하 상기와 같은 기술적 사상에 따른 본 발명의 바람직한 실시예를 첨부한 도면에 의거 상세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

첨부한 도면 도 2는 본 발명에 의한 이동 통신 단말기의 송신단 구성을 보인 도면이다.2 is a diagram illustrating a configuration of a transmitting end of a mobile communication terminal according to the present invention.

여기서, 참조부호 101은, 상기 IF 기저대역 신호를 저역 필터링하여 전단 기저대역 신호 처리부에서 부가한 8.192MHz의 체배 주파수를 제거하는 저역 필터부를 나타내고, 참조부호 102는 상기 저역 필터부(101)에서 필터링된 기저대역 신호를 QPSK 변조하는 QPSK 변조기를 나타내며, 참조부호 103은 상기 QPSK 변조기(102)에서 출력된 중간주파수(IF)를 대역 필터링하여 필요한 주파수 대역만을 통과시키는 LC 대역 필터를 나타낸다.Here, reference numeral 101 denotes a low pass filter for low-pass filtering the IF baseband signal to remove a multiplication frequency of 8.192 MHz added by a front end baseband signal processor, and reference numeral 102 denotes a low pass filter for filtering by the low pass filter 101. A QPSK modulator for QPSK modulating the baseband signal is indicated, and reference numeral 103 denotes an LC band filter for bandpassing the required frequency band by band filtering the intermediate frequency IF output from the QPSK modulator 102.

또한, 참조부호 104는 상기 LC 대역 필터(103)를 통한 송신 신호의 이득을 제어하는 자동 이득 제어부를 나타내며, 참조부호 105는 상기 자동 이득 제어부(104)에서 출력되는 송신 신호를 고주파수로 상향 변환하는 주파수 상향 변환기를 나타내고, 참조부호 106은 상기 주파수 상향 변환기(105)에서 출력되는 고주파를 설정 대역으로 필터링하는 고주파 대역 필터를 나타낸다.In addition, reference numeral 104 denotes an automatic gain control unit for controlling the gain of the transmission signal through the LC band filter 103, and reference numeral 105 denotes an upconversion of the transmission signal output from the automatic gain control unit 104 to a high frequency. A frequency up-converter is indicated, and reference numeral 106 denotes a high-frequency band filter for filtering the high frequency output from the frequency up-converter 105 to a set band.

또한, 참조부호 107은 상기 고주파 대역 필터(106)에서 출력되는 신호를 전치 증폭하는 전치 증폭기를 나타내고, 참조부호 108은 상기 전치 증폭기(108)의 출력 신호를 소정 레벨로 증폭하는 드라이브 증폭기를 나타내며, 참조부호 109는 상기 드라이브 증폭기(108)의 출력 신호를 최종적으로 증폭하여 송신 신호로 출력하는 최종 증폭기를 나타낸다.In addition, reference numeral 107 denotes a preamplifier for preamplifying the signal output from the high frequency band filter 106, reference numeral 108 denotes a drive amplifier for amplifying the output signal of the preamplifier 108 to a predetermined level, Reference numeral 109 denotes a final amplifier which finally amplifies the output signal of the drive amplifier 108 and outputs it as a transmission signal.

이와 같이 구성된 본 발명에 의한 이동통신 단말기는 저역 필터부(101)에서 전단 기저대역 신호 처리부에서 전송된 IF 기저대역 신호를 저역 필터링하여 8.192MHz의 체배 주파수를 제거한다.The mobile communication terminal according to the present invention configured as described above performs low pass filtering on the IF baseband signal transmitted from the front end baseband signal processing unit in the low pass filter unit 101 to remove the multiplication frequency of 8.192 MHz.

즉, 상기 저역 필터부(101)는 기저대역 신호중 I 신호를 저역 필터링하기 위한 제 1 저역 필터(101a)와, Q신호를 저역 필터링하기 위한 제 2 저역 필터(101b)로 구성되며, 제 1 및 제 2 저역 필터(101a)(101b)는 각각 도 3과 같이 인덕터(L1) 커패시터(C1,C2)로 이루어진 3차 Chebyshev 저역 필터로 구성되어, 각각 입력되는 기저대역 신호에 포함된 8.192MHz의 체배 주파수를 제거하여 스푸리어스를 제거한다.That is, the low pass filter unit 101 includes a first low pass filter 101a for low pass filtering an I signal among baseband signals, and a second low pass filter 101b for low pass filtering a Q signal. Each of the second low pass filters 101a and 101b is composed of a third-order Chebyshev low pass filter made of inductor L1 capacitors C1 and C2, as shown in FIG. 3, and has a multiplication of 8.192 MHz included in the input baseband signal. Eliminate spurious by eliminating frequencies.

이렇게 스푸리어스가 제거된 신호는 QPSK 변조기(102)에 입력되며, QPSK 변조기(102)는 상기 저역 필터부(101)에서 필터링된 기저대역 신호를 QPSK 변조한다.The spurious-free signal is input to the QPSK modulator 102, and the QPSK modulator 102 performs QPSK modulation on the baseband signal filtered by the low pass filter 101.

그리고 LC 대역 필터(103)는 도 4와 같이 구현되는 LC 대역 필터를 이용하여 상기 QPSK 변조기(102)에서 출력된 중간주파수(IF)를 대역 필터링하여 필요한 주파수 대역(140MHz)만을 통과시킨다.In addition, the LC band filter 103 band filters the intermediate frequency IF output from the QPSK modulator 102 using an LC band filter implemented as shown in FIG. 4 to pass only the required frequency band (140 MHz).

첨부한 도면 도 5는 상기 LC 대역 필터(103)의 특성 곡선을 도시한 것이다.5 shows a characteristic curve of the LC band filter 103.

아울러 자동 이득 제어부(104)는 기지국에서 전송한 전력 제어 정보 및 수신한 신호로부터 얻어진 RSSI를 합하여 설정된 이득에 따라 상기 LC 대역 필터(103)를 통한 송신 신호의 이득을 제어한다.In addition, the automatic gain control unit 104 controls the gain of the transmission signal through the LC band filter 103 according to the gain set by adding the power control information transmitted from the base station and the RSSI obtained from the received signal.

이렇게 이득이 제어된 송신 신호는 주파수 상향 변환기(105)에 입력되며, 상기 주파수 상향 변환기(105)는 상기 자동 이득 제어부(104)에서 출력되는 송신 신호를 고주파수로 상향 변환하게 되고, 고주파수 대역 필터(106)는 상기 주파수 상향 변환기(105)에서 출력되는 고주파수를 설정 대역(2315MHz)으로 필터링한다.The gain-controlled transmission signal is input to the frequency up converter 105, and the frequency up converter 105 up-converts the transmission signal output from the automatic gain control unit 104 to a high frequency. 106 filters the high frequency output from the frequency up-converter 105 to a set band (2315 MHz).

전치 증폭기(107)는 상기 고주파 대역 필터(106)에서 출력되는 신호를 전치 증폭하게 되고, 드라이버 증폭기(108)는 상기 전치 증폭기(107)의 출력 신호를 소정 레벨로 증폭하게 되고, 최종 증폭기(109)는 상기 드라이브 증폭기(108)의 출력 신호를 최종적으로 증폭하여 송신 신호로 출력한다.The preamplifier 107 preamplifies the signal output from the high frequency band filter 106, the driver amplifier 108 amplifies the output signal of the preamplifier 107 to a predetermined level, and the final amplifier 109. ) Amplifies the output signal of the drive amplifier 108 and outputs it as a transmission signal.

첨부한 도면 도 6은 본 발명에 적용된 저역 필터의 특성을 설명하기 위한 RF 출력 스펙트럼으로써, 도 6a는 기존과 같이 송신신호 입력단에 저역 필터를 사용하지 않았을 경우의 RF 출력 스펙트럼이고, 도 6b는 본 발명에서와 같이 송신신호 입력단에 저역 필터를 사용한 경우의 RF 출력 스펙트럼을 나타낸 것이다.FIG. 6 is an RF output spectrum for explaining the characteristics of the low pass filter applied to the present invention. FIG. 6A is an RF output spectrum when a low pass filter is not used at a transmission signal input as in the prior art. As in the present invention, the RF output spectrum when the low pass filter is used at the input signal is shown.

이상에서 상술한 본 발명 " 이동통신 시스템의 단말기"에 따르면, QPSK 변조기 전단에 I,Q 저역 필터를 부가함으로써, 기저 대역의 8.192MHz 클럭노이즈를 제거할 수 있으므로 송신 스푸리어스 특성을 개선할 수 있는 이점이 있다.According to the above-described "terminal of the mobile communication system", the baseband 8.192MHz clock noise can be eliminated by adding the I, Q low pass filter in front of the QPSK modulator, so that the transmission spurious characteristic can be improved. There is an advantage to that.

또한, 기존에 사용하는 TX IF SAW 필터 대신 LC 대역 필터를 사용함으로써 경로 손실을 보상할 수 있어 증폭기의 추가 전력을 저감할 수 있는 이점이 있다.In addition, by using an LC band filter instead of the conventional TX IF SAW filter, path loss can be compensated for, thereby reducing the additional power of the amplifier.

또한, 송신 스푸리어스를 제거하기 위해서 기존에는 RF단에는 복수개의 대역필터를 사용하고, IF단에는 SAW 필터를 사용하였으나, 본 발명은 1개의 RF 대역필터와 LC 필터만을 사용하므로, 필터의 사용을 줄일 수 있어 전체적인 원가 절감과 회로 구성 부품의 감소로 회로 사이즈도 줄일 수 있는 이점이 있다.In addition, in order to remove the transmission spurious, a plurality of band filters are used in the RF stage and SAW filters are used in the IF stage. However, the present invention uses only one RF band filter and an LC filter. This reduces the overall cost and reduces the circuit components, thereby reducing the circuit size.

Claims (3)

기저대역 신호 처리부에서 처리된 IF 기저대역 신호를 QPSK 변조하고, 고주파수로 상향 변환한 후 증폭하여 출력하는 이동통신 단말기에 있어서,In the mobile communication terminal for performing QPSK modulation of the IF baseband signal processed by the baseband signal processor, up-converting to a high frequency, and amplifying and outputting the same; 상기 IF 기저대역 신호를 저역 필터링하여 상기 기저대역 신호 처리부에서 부가한 8.192MHz의 체배 주파수를 제거하는 저역 필터부와;A low pass filter for low frequency filtering the IF baseband signal to remove a multiplication frequency of 8.192 MHz added by the baseband signal processor; 상기 저역 필터부에서 필터링된 기저대역 신호를 QPSK 변조하는 QPSK 변조기와;A QPSK modulator for QPSK modulating the baseband signal filtered by the low pass filter; 상기 QPSK 변조기에서 출력된 중간주파수(IF)를 대역 필터링하여 필요한 주파수 대역만을 통과시키는 LC 대역 필터와;An LC band filter for band filtering the intermediate frequency IF output from the QPSK modulator and passing only a required frequency band; 상기 LC 대역 필터를 통한 송신 신호의 이득을 제어하는 자동 이득 제어부와;An automatic gain control unit controlling a gain of a transmission signal through the LC band filter; 상기 자동 이득 제어부에서 출력되는 송신 신호를 고주파수로 상향 변환하는 주파수 상향 변환기와;A frequency upconverter for upconverting the transmission signal output from the automatic gain control unit to a high frequency; 상기 주파수 상향 변환기에서 출력되는 고주파를 설정 대역으로 필터링하는 고주파 대역 필터와;A high frequency band filter for filtering a high frequency output from the frequency up-converter into a set band; 상기 고주파 대역 필터에서 출력되는 신호를 전치 증폭하는 전치 증폭기와;A preamplifier for preamplifying the signal output from the high frequency band filter; 상기 전치 증폭기의 출력 신호를 소정 레벨로 증폭하는 드라이브 증폭기와;A drive amplifier for amplifying the output signal of the preamplifier to a predetermined level; 상기 드라이브 증폭기의 출력 신호를 최종적으로 증폭하여 송신 신호로 출력하는 최종 증폭기를 포함하여 구성된 것을 특징으로 하는 이동통신 시스템의 단말기.And a final amplifier for finally amplifying the output signal of the drive amplifier and outputting the output signal as a transmission signal. 제 1 항에 있어서, 상기 저역 필터부는, 기저대역 신호중 I 신호를 저역 필터링하기 위한 제 1 저역 필터와, 상기 기저대역 신호중 Q신호를 저역 필터링하기 위한 제 2 저역 필터로 구성된 것을 특징으로 하는 이동통신 시스템의 단말기.The mobile communication apparatus of claim 1, wherein the low pass filter comprises a first low pass filter for low pass filtering an I signal in a baseband signal, and a second low pass filter for low pass filtering a Q signal in the baseband signal. The terminal of the system. 제 2 항에 있어서, 상기 제 1 및 제 2 저역 필터는, 각각 3차 Chebyshev 저역 필터인 것을 특징으로 하는 이동통신 시스템의 단말기.3. The terminal of claim 2, wherein each of the first and second low pass filters is a third order Chebyshev low pass filter.
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