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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frequency
signal
pass filter
filter
band
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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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    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/0115Frequency selective two-port networks comprising only inductors and capacitors
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/17Structural details of sub-circuits of frequency selective networks
    • H03H7/1741Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1783Combined LC in series path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/38Transceivers, 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
    • H04B1/40Circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10Small scale networks; Flat hierarchical networks
    • H04W84/14WLL [Wireless Local Loop]; RLL [Radio Local Loop]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices

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} Terminal of a mobile communication system {Mobile station 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 is a mobile communication system employing the CDMA system (PCS, DCS, W-CDMA WLL) saw filter release from relates to a terminal, in particular, essentially used in the conventional (SAW Filter) for not without also transmit spurious (Spurious using ) relates to a terminal of a mobile communication system ever improving the properties.

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, the transmission signal (I, Q) by adding the low-pass filter (LPF) to the input terminal by removing the 8.192MHz clock multiplication noise in the baseband, and to improve the transmission spurious characteristic, shoot conventional transmission intermediate frequency by using Lumped LC filter BPF instead relates to a mobile terminal of the ever reducing the loss of the transmission signal reducing the current consumption of the amplifier communication system.

일반적으로, 이동 통신 시스템에 사용되는 단말기는, 송신 기저 대역 신호인 I,Q 파형을 별도의 처리없이 중간주파수 QPSK 변조기로 입력시켜, QPSK 신호로 변조하였다. In general, the device used in the mobile communication system, to enter the in I, Q waveforms transmit baseband signal to an intermediate frequency QPSK modulator without any processing, was modulated with the QPSK signal. 이것은 기저대역(Baseband)으로 입력되는 송신신호는 양호한 특성을 갖고 있다고 가정했기 때문이다. This is because we assume that the transmission signal input to the baseband (Baseband) has good characteristics. 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. However, because actually a multiple of the frequency of 8.192MHz used to generate a CDMA signal at the baseband input to the IF stage with the signal, the waveform of the RF antenna output is generated in the multiple of the frequency of the spurious 8.192MHz. 따라서이러한 송신 스푸리어스를 제거하기 위해서 종래에는 고가이면서 부피가 큰 RF 유전체 공진기 필터와 IF SAW 필터를 사용하였다. Therefore, conventionally, expensive and was used for bulky RF dielectric resonator filter and the IF SAW filter in order to remove these spurious transmission.

첨부한 도면 도 1은 상기와 같은 RF 유전체 공진 필터와 IF SAW 필터를 사용한 종래 이동통신 시스템에서 단말기의 송신단 구성을 보인 도면이다. The accompanying drawings Figure 1 is a diagram showing a configuration of a transmitting-end filter and the RF dielectric resonator device in a conventional mobile communication system using the IF SAW filter as described above.

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, As illustrated, IF baseband signal (I, Q) of the QPSK modulator (1) for QPSK modulation and output the modulated intermediate frequency, necessary to filter the intermediate frequency (IF) output from the QPSK modulator (1) and the intermediate frequency SAW filter 2 and the automatic gain control unit 3 for controlling the gain of the transmission signal through the intermediate frequency SAW filter 2 which passes only the frequency bands, transmission output from the automatic gain control unit (3) and a frequency up-converter (4) for up-converting a signal at a high frequency, in a first band pass filter (5) and said first band pass filter (5) for filtering the high-frequency output from the frequency up-converter 4 in the set band and the pre-amplifier 6 for amplifying an output signal to be transposed, a predetermined output signal of the second band-pass filter 7 and the second band pass filter (7) for band filtering the output signal of the preamplifier 6 levels and a drive amplifier 8 for amplifying a, 상기 드라이브 증폭기(8)의 출력 신호를 최종적으로 증폭하여 출력하는 최종 증폭기(9)로 구성되었다. It consisted of the final amplifier (9) for outputting the finally amplified in an output signal from 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. Thus, the transmitting end of the terminal device used in the conventional mobile communication system is configured, first, the modulated QPSK modulator (1), the baseband signal processing section IF baseband signal (I, Q) of the quadrature-phase component transmission in the QPSK. 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. That is, the baseband signal processing section in the IF PLL synthesizer (Synthesizer) using the phase shifter when supplied to 140MHz creates a local signal with a phase of 0 ° of the local signal with a phase of 90 ° from. 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. To do this, each of the local signal generated is input to the QPSK modulator (1), QPSK modulator (1) comes into each QPSK modulation to the interior of the In-Phase Modulator and Quadrature Phase modulator, so the modulated IF signal is the middle of the rear end is transmitted to the 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. The intermediate frequency SAW filter (2) is transmitted IF signal at an intermediate frequency (IF) output from the QPSK modulator (1) passes, the unnecessary band signal is blocked. 즉, 필터링을 통해 필요한 주파수 대역(예를 들어, 140MHz)만을 통과시킨다. That is, to pass only a frequency band (e.g., 140MHz) required through the filter.

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. Transmitted through the automatic gain control unit 3 has the intermediate frequency SAW filter (2) by using the results the combined variation of the RSSI value according to the power control information and the reception level transmitted from the base station to perform power control on the reverse link and it controls 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. And frequency up converter 4 which converts the uplink transmission signal from the automatic gain control unit 3 to a high frequency (RF). 여기서 주파수 상향 변환기(4)는 PLL 신디사이저로부터 2455MHz의 로컬 주파수를 공급 받는다. The frequency up-converter 4 is supplied with the local frequency of 2455MHz 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 pass filter (5) is filtered by the band (2315MHz) sets the high-frequency output from the frequency up-converter (4).

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. In addition, the pre-amplifier 6, a band of an output signal of the first band and to a signal output from the filter (5) pre-amplifier, a second band pass filter 7 is the pre-amplifier (6) in order to compensate for the path loss The filtering. 여기서, 제 2 대역 필터(7)는 고가이면서 부피가 큰 RF 유전체 공진기 필터를 사용한다. Here, the second band pass filter (7) is expensive and uses a 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. And drive amplifier 8 and the second band is an output signal of filter 7 is amplified to a predetermined level, the final amplifier 9 is outputted to the transmission frequency and finally amplified in an output signal from the drive amplifier 8 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, this conventional mobile communication terminal is input to the transmitting end with a frequency of 8.192MHz signal multiplier used to generate a CDMA signal from the base band processing and generating the transmission spurious, expensive and bulky in order to remove it by using RF dielectric resonator filter and the intermediate frequency SAW filter, and causing the disadvantage that the size of the device increases the production cost higher.

또한, 경로 손실을 보상하기 위해서 증폭기에서 그 증폭도를 높임으로써 전력 소모가 커지는 단점도 있었다. Further, by increasing the amplification degree in the amplifier in order to compensate for the path loss it was a disadvantage that the power consumption increases.

따라서 본 발명은 상기와 같은 종래 이동통신 단말기에서 발생하는 제반 문제점을 해결하기 위해서 제안된 것으로서, Therefore, present invention has been proposed in order to solve the various problems encountered 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. An object of the present invention is to shoot without using a filter (SAW Filter) that were essentially used in the conventional terminal is also provided a mobile communication system of the ever improving transmission spurious (Spurious) 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 단말기를 제공하는 데 있다. More specifically, the transmission signal (I, Q) by adding the low-pass filter (LPF) to the input terminal by removing the 8.192MHz clock multiplication noise in the baseband, and to improve the transmission spurious characteristic, shoot conventional transmission intermediate frequency by using Lumped LC filter BPF in place to provide a device for moving the ever reducing the loss of the transmission signal reducing the current consumption of the amplifier communication system.

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

기저대역 신호 처리부에서 처리된 IF 기저대역 신호를 QPSK 변조하고, 고주파수로 상향 변환한 후 증폭하여 출력하는 이동통신 단말기에 있어서, In the IF baseband signal processing in the baseband signal processing section in the mobile terminal of the QPSK modulation, and amplifies and outputs then up-converted to a high frequency,

상기 IF 기저대역 신호를 저역 필터링하여 상기 기저대역 신호 처리부에서 부가한 8.192MHz의 체배 주파수를 제거하는 저역 필터부와; A low-pass filter unit for low pass filtering the IF baseband signal to remove the multiple of the frequency of 8.192MHz portion in the baseband signal processing unit and;

상기 저역 필터부에서 필터링된 기저대역 신호를 QPSK 변조하는 QPSK 변조기와; And a QPSK modulator for QPSK modulates the baseband signal filtered by the low pass filter section;

상기 QPSK 변조기에서 출력된 중간주파수(IF)를 대역 필터링하여 필요한 주파수 대역만을 통과시키는 LC 대역 필터와; LC-pass filter which by-pass filtering the intermediate frequency (IF) output from the QPSK modulator passes only a required frequency band and;

상기 LC 대역 필터를 통한 송신 신호의 이득을 제어하는 자동 이득 제어부와; And an automatic gain controller for controlling a gain of a transmission signal via the LC band pass filter;

상기 자동 이득 제어부에서 출력되는 송신 신호를 고주파수로 상향 변환하는 주파수 상향 변환기와; Frequency up-converter for up-converting a transmission signal output from the automatic gain control at a high frequency and;

상기 주파수 상향 변환기에서 출력되는 고주파를 설정 대역으로 필터링하는 고주파 대역 필터와; And a high band filter to filter out high-frequency output from the frequency up-converter as set band;

상기 고주파 대역 필터에서 출력되는 신호를 전치 증폭하는 전치 증폭기와; And a preamplifier for pre-amplifying the signal output from the high-frequency-band filter;

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

상기 드라이브 증폭기의 출력 신호를 최종적으로 증폭하여 송신 신호로 출력하는 최종 증폭기로 구성됨을 특징으로 한다. And finally amplified in the output signal of the drive amplifier is characterized by consisting of a final amplifier to output a transmission signal.

도 1은 종래 이동통신 시스템에서 단말기의 송신단 구성을 보인 블록도이고, FIG 1 is a block diagram illustrating a transmitter structure 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 illustrating a transmitter structure of a terminal in a mobile communication system according to the invention,

도 3은 도 2의 저역 필터의 일 실시예를 보인 회로도이고, 3 is a circuit diagram illustrating an embodiment of a low-pass filter of Figure 2,

도 4는 도 2의 LC 필터의 일 실시예를 보인 회로도이고, Figure 4 is a circuit diagram illustrating an embodiment of the LC filter in Fig. 2,

도 5는 도 4에 도시된 LC 필터의 특성 곡선도이고, 5 is a characteristic curve of an LC filter shown in Figure 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. 6 is by RF output spectrum for explaining the characteristics of the low pass filter applied in the invention, Figure 6a is a low-pass filter to the RF output spectrum, and the transmission signal input end Figure 6b of the case not using the low-pass filter to the transmission signal input terminal an RF output spectrum when used.

<도면의 주요 부분에 대한 부호의 설명> <Description of the Related Art>

101 : 저역 필터부 101: low-pass filter section

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

102 : QPSK 변조기 102: QPSK modulator

103 : LC 저역 필터 103: LC low-pass filter

106 : 고주파 대역 필터 106: high-frequency band-pass filter

이하 상기와 같은 기술적 사상에 따른 본 발명의 바람직한 실시예를 첨부한 도면에 의거 상세히 설명하면 다음과 같다. If described in detail based on the accompanying drawings, the preferred embodiment of the invention according to the technical idea as follows the following:

첨부한 도면 도 2는 본 발명에 의한 이동 통신 단말기의 송신단 구성을 보인 도면이다. The accompanying drawings, Figure 2 is a diagram showing a transmitter configuration 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, the reference numeral 101, the IF to base-band low-pass filtering the signal denotes a low pass filter to remove a multiple of the frequency of 8.192MHz a portion at the front end the baseband signal processing section, numeral 102 is filtered by the low pass filter unit 101 a denotes a QPSK modulator for QPSK-modulated baseband signal, and reference numeral 103 denotes a LC band pass filter that passes only the frequency band required by-pass 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. Further, reference numeral 104 denotes the automatic gain control unit for controlling a gain of a transmission signal via the LC band pass filter 103, and reference numeral 105 is for up-converting a transmission signal output from the automatic gain controller 104 at a high frequency denotes a frequency up-converter, and reference numeral 106 denotes a high-frequency band filter for filtering a high-frequency output from the frequency up-converter 105 in the set range.

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 drive amplifier for amplifying the output signal of the denotes a preamplifier for pre-amplifying the signal output from the high-frequency band filter 106, and reference numeral 108 denotes the pre-amplifier 108 to a predetermined level, reference numeral 109 is finally amplified by the output signal from the drive amplifier 108 represents the final amplifier for outputting 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. A mobile communication terminal according to the present invention constructed as described above is low pass filtered by the IF baseband signals transmitted from the front end the baseband signal processing section in the low-pass filter unit 101 removes a multiple of the frequency of 8.192MHz.

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 portion 101 is composed of a first low-pass filter (101a), a second low pass filter (101b) to low pass filter the Q signal to low-pass filtering the baseband sinhojung I signal and the first and a second low-pass filter (101a) (101b) is a third-order Chebyshev consists of a low-pass filter, the multiplier of 8.192MHz included in the baseband signal to be input each consisting of an inductor (L1) a capacitor (C1, C2) as shown in FIG. 3, respectively by removing the frequency to remove spurious.

이렇게 스푸리어스가 제거된 신호는 QPSK 변조기(102)에 입력되며, QPSK 변조기(102)는 상기 저역 필터부(101)에서 필터링된 기저대역 신호를 QPSK 변조한다. So scan the spurious signal has been removed are input to QPSK modulator 102 and QPSK modulator 102 modulates a QPSK baseband signal filtered by the low pass filter section 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. And thereby LC band pass filter 103 passes only a frequency band (140MHz) required by using a LC band pass filter to filter an intermediate frequency (IF) output from the QPSK modulator 102 is implemented as shown in FIG.

첨부한 도면 도 5는 상기 LC 대역 필터(103)의 특성 곡선을 도시한 것이다. The accompanying drawings, Figure 5 illustrates the characteristic curve of the band LC 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 via the LC band pass filter 103 according to the gain set by adding the RSSI resulting from the power control information and the received signal transmitted from the base station.

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 thus gain controlled transmission signal is input to the frequency up-converter 105, the frequency up-converter 105 is to up-convert the transmission signal output from the automatic gain controller 104 at a high frequency, the high frequency band filters ( 106) is filtered by setting the band (2315MHz), the high-frequency output from the frequency up-converter 105.

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. Preamplifier 107 is to pre-amplify the signal output from the high-frequency band filter 106, a driver amplifier 108 is to amplify the output signal of the preamplifier 107 to a predetermined level, the final amplifier (109 ) it is finally amplified by the output signal from the drive amplifier 108 and outputs the 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. The accompanying drawings, Figure 6 by RF output spectrum for explaining the characteristics of the low pass filter applied to the present invention, Figure 6a is an RF output spectrum when they have not been used for the low-pass filter to the transmission signal input terminal, such as conventional, Figure 6b is the It shows the RF power spectrum in the case of using a low-pass filter to the transmission signal input terminal, as in the invention.

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. The present invention described above, according to the "terminal of a mobile communication system", by adding the I, Q low-pass filter to the QPSK modulator shear, it is possible to remove the 8.192MHz clock noise from the baseband to improve the transmission spurious characteristic there is an advantage in 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, there is an advantage capable of reducing the additional power of the amplifier it is possible to compensate for the path loss by using the TX IF SAW filter instead of LC-pass filter used in the conventional.

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. Further, using a plurality of band pass filter Previously, RF stages in order to remove the transmission spurious and, IF stage include, but using the SAW filter, since the present invention uses only a single RF band pass filter and an LC filter, the use of filter it has the advantage of reducing the circuit size can be reduced to also reduce the overall cost and circuit components.

Claims (3)

  1. 기저대역 신호 처리부에서 처리된 IF 기저대역 신호를 QPSK 변조하고, 고주파수로 상향 변환한 후 증폭하여 출력하는 이동통신 단말기에 있어서, In the IF baseband signal processing in the baseband signal processing section in the mobile terminal of the QPSK modulation, and amplifies and outputs then up-converted to a high frequency,
    상기 IF 기저대역 신호를 저역 필터링하여 상기 기저대역 신호 처리부에서 부가한 8.192MHz의 체배 주파수를 제거하는 저역 필터부와; A low-pass filter unit for low pass filtering the IF baseband signal to remove the multiple of the frequency of 8.192MHz portion in the baseband signal processing unit and;
    상기 저역 필터부에서 필터링된 기저대역 신호를 QPSK 변조하는 QPSK 변조기와; And a QPSK modulator for QPSK modulates the baseband signal filtered by the low pass filter section;
    상기 QPSK 변조기에서 출력된 중간주파수(IF)를 대역 필터링하여 필요한 주파수 대역만을 통과시키는 LC 대역 필터와; LC-pass filter which by-pass filtering the intermediate frequency (IF) output from the QPSK modulator passes only a required frequency band and;
    상기 LC 대역 필터를 통한 송신 신호의 이득을 제어하는 자동 이득 제어부와; And an automatic gain controller for controlling a gain of a transmission signal via the LC band pass filter;
    상기 자동 이득 제어부에서 출력되는 송신 신호를 고주파수로 상향 변환하는 주파수 상향 변환기와; Frequency up-converter for up-converting a transmission signal output from the automatic gain control at a high frequency and;
    상기 주파수 상향 변환기에서 출력되는 고주파를 설정 대역으로 필터링하는 고주파 대역 필터와; And a high band filter to filter out high-frequency output from the frequency up-converter as set band;
    상기 고주파 대역 필터에서 출력되는 신호를 전치 증폭하는 전치 증폭기와; And a preamplifier for pre-amplifying the signal output from the high-frequency-band filter;
    상기 전치 증폭기의 출력 신호를 소정 레벨로 증폭하는 드라이브 증폭기와; And a drive amplifier for amplifying the output signal of the pre-amplifier to a predetermined level;
    상기 드라이브 증폭기의 출력 신호를 최종적으로 증폭하여 송신 신호로 출력하는 최종 증폭기를 포함하여 구성된 것을 특징으로 하는 이동통신 시스템의 단말기. Terminal of a mobile communication system, and finally amplified in the output signal of the amplifier, characterized in that the drive is configured including the final amplifier for outputting a transmission signal.
  2. 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 method of claim 1 wherein said low pass filter comprises: a mobile communication, characterized in that composed of the first low-pass filter for low pass filtering the baseband sinhojung I signal, a second low pass filter for low pass filtering the baseband sinhojung Q signal terminal of the system.
  3. 제 2 항에 있어서, 상기 제 1 및 제 2 저역 필터는, 각각 3차 Chebyshev 저역 필터인 것을 특징으로 하는 이동통신 시스템의 단말기. The method of claim 2, wherein the first and second low-pass filter, a terminal for a mobile communication system, characterized in that each third-order Chebyshev low pass filter.
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US8137466B2 (en) 2009-08-24 2012-03-20 Samsung Mobile Display Co., Ltd. Thin film deposition apparatus and method of manufacturing organic light-emitting display device by using the same
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