KR20010011832A - Device for generating intermediate frequency in transmitter circuit in triple mode mobile station - Google Patents

Device for generating intermediate frequency in transmitter circuit in triple mode mobile station Download PDF

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Publication number
KR20010011832A
KR20010011832A KR1019990031393A KR19990031393A KR20010011832A KR 20010011832 A KR20010011832 A KR 20010011832A KR 1019990031393 A KR1019990031393 A KR 1019990031393A KR 19990031393 A KR19990031393 A KR 19990031393A KR 20010011832 A KR20010011832 A KR 20010011832A
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South Korea
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frequency
control signal
circuit
vco
tuning
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KR1019990031393A
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Korean (ko)
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오정일
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김영환
현대전자산업 주식회사
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Priority to KR1019990031393A priority Critical patent/KR20010011832A/en
Publication of KR20010011832A publication Critical patent/KR20010011832A/en

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    • 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
    • H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • 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
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • 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
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

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

Abstract

PURPOSE: An apparatus for generating an intermediate frequency(IF) in a transmission circuit of a mobile terminal for triple mode use is provided to vary a turning circuit capacitance value of a voltage controlled oscillator(VOC) by a mode control signal of a controller, so as to simultaneously generate 255.38MHz and 130.38MHz IFs needed in a transmission circuit. CONSTITUTION: A controller(100) outputs a frequency control signal to a phase locked loop IC(PLL IC)(210) which is one of components of an intermediate frequency(IF) transmission chip(IFT chip)(200), and outputs a mode control signal to a tuning circuit(300). The IFT chip(200) comprises as follows. A voltage controlled oscillator(VCO)(220) generates an 130.38MHz or an 255.38MHz IF signal by a resonant frequency determined by the tuning circuit(300). The PLL IC(210) inputs a frequency control signal output from the controller(100), and simultaneously inputs a frequency signal fed back from the VCO(220), then outputs a phase-fixed frequency tuning voltage. An automatic gain controlling circuit is built in the IFT chip(200). The tuning circuit(300) inputs the frequency tuning voltage output from the PLL IC(210), and simultaneously inputs the mode control signal output from the controller(100), then varies a capacitance value according to the inputted frequency tuning voltage and the mode control signal. The tuning circuit(300) decides the resonant frequency of the VCO(220).

Description

트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치{DEVICE FOR GENERATING INTERMEDIATE FREQUENCY IN TRANSMITTER CIRCUIT IN TRIPLE MODE MOBILE STATION}DEVICE FOR GENERATING INTERMEDIATE FREQUENCY IN TRANSMITTER CIRCUIT IN TRIPLE MODE MOBILE STATION}

본 발명은 AMPS, 셀룰라 및 PCS 방식을 모두 채택하고 있는 트리플모드용 이동단말기의 송신회로에서의 중간주파수발생장치에 관한것이다.The present invention relates to an intermediate frequency generator in a transmission circuit of a triple mode mobile terminal employing all AMPS, cellular and PCS schemes.

종래 CDMA 방식의 이동단말기의 송신회로에서의 중간주파수 발생장치는 도 1에 도시한 바와같이 주파수 제어신호를 출력하는 제어부(10)와; 상기 제어부(10)에서 주파수 제어신호를 입력받는 동시에 후술되는 VCO(22, VOLTAGE CONTROLLED OSCILLATOR; 이하 VCO라 명명함)로부터 피드백되는 주파수신호를 입력받아 위상이 고정된 주파수 튜닝전압을 출력하는 PLL IC(21, PHASE LOCKED LOOP IC; 이하 PLL IC라 명명함)와, 후술되는 동조회로(30)에서 결정된 공진주파수를 발생하는 동시에 상기 PLL IC(21)에 주파수신호를 피드백시키는 VCO(22)를 구비한 BBA(20; BASEBAND ANALOGUE PROCESSOR)와; 상기 PLL IC(21)에서 주파수 튜닝전압을 입력받아 내장된 가변용량기의 용량값이 변환되어 VCO(22)의 공진주파수를 결정하는 동조회로(30)로 구성되어 있었다.An intermediate frequency generator in a transmission circuit of a conventional CDMA mobile terminal includes a control unit (10) for outputting a frequency control signal as shown in FIG. A PLL IC for receiving a frequency control signal from the control unit 10 and receiving a frequency signal fed back from a VCO (22, VOLTAGE CONTROLLED OSCILLATOR; hereinafter referred to as VCO) which will be described later and outputting a phase-tuned frequency tuning voltage. 21, PHASE LOCKED LOOP IC (hereinafter referred to as PLL IC) and a VCO 22 for generating a resonant frequency determined by the tuning circuit 30 to be described later and feeding back a frequency signal to the PLL IC 21. One BBA 20; a baseband analog process; The PLL IC 21 receives the frequency tuning voltage and converts the capacitance of the built-in variable capacitor into a tuning circuit 30 for determining the resonance frequency of the VCO 22.

그러나, 상기 가변용량기의 용량값 변화에 따른 전체 커패시턴스의 변화량이 작으므로 상기 종래의 송신회로 중간주파수 발생장치로서는 AMPS(ADVANCED MOBILE PHONE SYSTEM; 이하 AMPS라 명명함) 및 셀룰라(CELLULAR; 이하, 셀룰라라 명명함)방식의 이동단말기에 사용되는 중간주파수(255.38㎒)와 PCS(PERSONAL COMMUNICATION SERVICE; 이하 PCS라 명명함)방식의 이동단말기에 사용되는 중간주파수(130.38㎒)를 동시에 발생시킬 수 없다는 문제점이 있었다.However, since the change amount of the total capacitance according to the change of the capacitance of the variable capacitor is small, the conventional frequency generator of the transmitting circuit is called AMPS (ADVANCED MOBILE PHONE SYSTEM; hereinafter AMPS) and cellular (CELLULAR; hereinafter, cellular). It is not possible to simultaneously generate the intermediate frequency (255.38MHz) used for the mobile terminal of the type and the intermediate frequency (130.38MHz) used for the mobile terminal of the PCS (PERSONAL COMMUNICATION SERVICE; PCS) method. There was this.

따라서, 본 발명은 상기와 같은 문제점을 해결하기 위해 이루어진 것으로서, 본 발명의 목적은 AMPS, 셀룰라 및 PCS 방식의 송신회로에서 필요로 하는 중간주파수인 255.38㎒와 130.38㎒을 동시에 발생할 수 있는 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치를 제공하는 데 있다.Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is for triple mode, which can simultaneously generate 255.38 MHz and 130.38 MHz, which are intermediate frequencies required for AMPS, cellular, and PCS transmission circuits. An intermediate frequency generator in a transmitting circuit of a mobile terminal is provided.

상기와 같은 목적을 달성하기 위해 본 발명에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치는 주파수 제어신호와 모드제어신호를 개별적으로 출력하는 제어부와; 130.38㎒ 또는 255.38㎒의 중간주파수 신호를 발생하는 VCO와, 상기 제어부에서 주파수 제어신호를 입력받는 동시에 상기 VCO로부터 피드백되는 주파수신호를 입력받아 위상이 고정된 주파수 튜닝전압을 출력하는 PLL IC를 구비한 IFT 칩과; 상기 PLL IC에서 주파수 튜닝전압을 입력받는 동시에 상기 제어부에서 모드제어신호를 입력받아 이에 상응하여 커패시턴스 값을 가변시켜 상기 VCO의 공진주파수를 결정하는 동조회로부로 이루어진 것을 특징으로 한다.In order to achieve the above object, the intermediate frequency generating apparatus in the transmission circuit of the triple mode mobile terminal according to the present invention includes a control unit for separately outputting a frequency control signal and a mode control signal; A VCO generating an intermediate frequency signal of 130.38 MHz or 255.38 MHz, and a PLL IC receiving a frequency control signal from the control unit and a frequency signal fed back from the VCO and outputting a phase-locked frequency tuning voltage. An IFT chip; And a tuning circuit unit configured to determine a resonance frequency of the VCO by receiving a mode tuning signal from the PLL IC and receiving a mode control signal from the controller and varying a capacitance value accordingly.

도 1은 종래기술에 의한 CDMA 방식을 이용하는 이동단말기의 송신회로에서의 중간주파수 발생장치에 대한 제어블록도,1 is a control block diagram of an intermediate frequency generator in a transmission circuit of a mobile terminal using a conventional CDMA scheme;

도 2는 본 발명의 일실시예에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치에 대한 제어블록도.2 is a control block diagram of an intermediate frequency generator in a transmitting circuit of a triple mode mobile terminal according to one embodiment of the present invention;

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

100 : 제어부 200 : IFT 칩100: control unit 200: IFT chip

210 : PLL IC 220 : VCO210: PLL IC 220: VCO

300 : 동조회로부300: tuning circuit part

이하, 본 발명의 일실시예에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치에 대해 첨부된 도면을 참조하여 상세히 기술하기로 한다.Hereinafter, an intermediate frequency generator in a transmission circuit of a triple mode mobile terminal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일실시예에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치에 대한 제어블록도로서, 본 발명의 일실시예에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치는 제어부(100), IFT 칩(200; INTERMEDIATE FREQUENCY TRANSMITTER CHIP; 이하, IFT 칩이라 명명함.) 및 동조회로부(300)로 구성되어 있다.FIG. 2 is a control block diagram of an intermediate frequency generator in a transmitting circuit of a triple mode mobile terminal according to an embodiment of the present invention, and in a transmitting circuit of a triple mode mobile terminal according to an embodiment of the present invention. The intermediate frequency generator includes a control unit 100, an IFT chip 200 (hereinafter referred to as an IFT chip), and a tuning circuit unit 300.

상기 제어부(100)는 주파수 제어신호를 상기 IFT 칩(200)의 구성요소인 PLL IC(210)에 출력하는 한편, 모드제어신호를 상기 동조회로부(300)에 출력하는 역할을 한다.The controller 100 outputs a frequency control signal to the PLL IC 210 which is a component of the IFT chip 200, and outputs a mode control signal to the tuning circuit unit 300.

상기 IFT 칩(200)은 상기 동조회로부(300)에 의해 결정되는 공진주파수에 의해 130.38㎒ 또는 255.38㎒의 중간주파수 신호를 발생하는 VCO(220)와, 상기 제어부(100)에서 주파수 제어신호를 입력받는 동시에 상기 VCO(220)로부터 피드백되는 주파수신호를 입력받아 위상이 고정된 주파수 튜닝전압을 출력하는 PLL IC(210)를 구비하고 있으며, 내부에 자동이득조절회로가 내장된다.The IFT chip 200 inputs a VCO 220 for generating an intermediate frequency signal of 130.38 MHz or 255.38 MHz by the resonance frequency determined by the tuning circuit unit 300, and inputs a frequency control signal from the control unit 100. A PLL IC 210 is provided to receive a frequency signal fed back from the VCO 220 and output a frequency tuning voltage having a phase fixed thereto, and has an automatic gain control circuit therein.

상기 동조회로부(300)는 상기 PLL IC(210)에서 주파수 튜닝전압을 입력받는 동시에 상기 제어부(100)에서 모드제어신호를 입력받아 이에 상응하여 커패시턴스 값을 가변시켜 상기 VCO(220)의 공진주파수를 결정하는 역할을 한다.The tuning circuit unit 300 receives a frequency tuning voltage from the PLL IC 210 and at the same time receives a mode control signal from the control unit 100 to change the capacitance value accordingly to adjust the resonance frequency of the VCO 220. It plays a role.

상기와 같은 구성을 가지는 본 발명의 일실시예에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치에 대한 작용을 설명하기로 한다.An operation of the intermediate frequency generator in the transmitting circuit of the triple mode mobile terminal according to an embodiment of the present invention having the above configuration will be described.

먼저, 제어부(100)가 주파수 제어신호를 출력하면, PLL IC(200)는 상기 제어부(100)에서 주파수 제어신호를 입력받는 동시에 상기 VCO(220)로부터 피드백되는 주파수신호를 입력받아 위상이 고정된 주파수 튜닝전압을 출력하고, 이에 따라 동조회로부(300)는 상기 주파수 튜닝전압과 상기 제어부(100)에서 발생된 모드제어신호에 의해 전체 커패시턴스의 값이 가변된다.First, when the control unit 100 outputs a frequency control signal, the PLL IC 200 receives a frequency control signal from the control unit 100 and at the same time receives a frequency signal fed back from the VCO 220, the phase is fixed. The frequency tuning voltage is output, and accordingly, the tuning circuit unit 300 varies the total capacitance value according to the frequency tuning voltage and the mode control signal generated by the controller 100.

이에따라, VCO(220)는 공진주파수가 결정되어 AMPS 및 셀룰라 방식의 송신중간주파수인 130.38㎒대의 신호 또는 PCS 방식 송신중간주파수인 255.38㎒대의 신호를 하나의 장치로서 발생할 수 있다.Accordingly, the VCO 220 may determine a resonance frequency and generate a signal of 130.38 MHz, which is an AMPS and cellular transmission intermediate frequency, or a signal of 255.38 MHz, which is a PCS transmission intermediate frequency, as one device.

상술한 바와 같이 본 발명에 의한 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치에 의하면 제어부의 모드제어신호에 의해 VCO의 동조회로 커패시턴스값을 가변하므로써 AMPS, 셀룰라 및 PCS 방식의 송신회로에서 필요로 하는 중간주파수인 255.38㎒와 130.38㎒을 동시에 발생할 수 있다는 뛰어난 효과가 있다.As described above, according to the intermediate frequency generator in the transmission circuit of the triple mode mobile terminal according to the present invention, the AMPS, cellular, and PCS transmission circuits are controlled by varying the tuning circuit capacitance value of the VCO according to the mode control signal of the controller. There is an excellent effect that it can simultaneously generate 255.38MHz and 130.38MHz, which are the intermediate frequencies required by.

Claims (1)

주파수 제어신호와 모드제어신호를 개별적으로 출력하는 제어부와;A controller for separately outputting a frequency control signal and a mode control signal; 130.38㎒ 또는 255.38㎒의 중간주파수 신호를 발생하는 VCO와, 상기 제어부에서 주파수 제어신호를 입력받는 동시에 상기 VCO로부터 피드백되는 주파수신호를 입력받아 위상이 고정된 주파수 튜닝전압을 출력하는 PLL IC를 구비한 IFT 칩과;A VCO generating an intermediate frequency signal of 130.38 MHz or 255.38 MHz, and a PLL IC receiving a frequency control signal from the control unit and a frequency signal fed back from the VCO and outputting a phase-locked frequency tuning voltage. An IFT chip; 상기 PLL IC에서 주파수 튜닝전압을 입력받는 동시에 상기 제어부에서 모드제어신호를 입력받아 이에 상응하여 커패시턴스 값을 가변시켜 상기 VCO의 공진주파수를 결정하는 동조회로부로 이루어진 것을 특징으로 하는 트리플모드용 이동단말기의 송신회로에서의 중간주파수 발생장치.The tuning mode of the mobile terminal for triple mode, characterized in that the PLL IC receives a frequency tuning voltage and at the same time receives a mode control signal from the controller to vary the capacitance value to determine the resonant frequency of the VCO. Intermediate frequency generator in transmission circuit.
KR1019990031393A 1999-07-30 1999-07-30 Device for generating intermediate frequency in transmitter circuit in triple mode mobile station KR20010011832A (en)

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