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KR100655972B1 - Mobile communication terminal having GPS power management function and method - Google Patents

Mobile communication terminal having GPS power management function and method Download PDF

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KR100655972B1
KR100655972B1 KR1020040085049A KR20040085049A KR100655972B1 KR 100655972 B1 KR100655972 B1 KR 100655972B1 KR 1020040085049 A KR1020040085049 A KR 1020040085049A KR 20040085049 A KR20040085049 A KR 20040085049A KR 100655972 B1 KR100655972 B1 KR 100655972B1
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gps
power management
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control unit
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KR20060035519A (en
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강도우
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엘지전자 주식회사
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q20/34—Payment architectures, schemes or protocols characterised by the use of specific devices or networks using cards, e.g. integrated circuit [IC] cards or magnetic cards
    • G06Q20/341—Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
    • H04M2201/34—Microprocessors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/10—Details of telephonic subscriber devices including a GPS signal receiver

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Abstract

본 발명은 GPS 전원관리 기능을 갖는 이동통신 단말기 및 그 방법에 관한 것이다. 본 발명은, 발진부에서 동작 클럭을 공급하고, 저잡음증폭기는 GPS위성신호를 증폭하며, RF신호 처리부 RF신호를 소정 레벨로 증폭시켜 주파수 다운 변환함으로써, 미약한 반송파에 실려있던 GPS신호를 강한 아날로그 신호로 변환한 후, 다시 디지털 변환하여 디지털신호 처리부로 전송하는 이동통신 단말기의 GPS 전원관리방법에 있어서, 디지털신호 처리부에서 주제어부로 UART를 통해 전원관리 명령을 전달하고; 주제어부에서 상기 디지털신호 처리부로부터 UART 전원관리 명령을 전달받고, I2C 버스를 통하여 전원제어부를 직접 제어하고; 전원제어부에서 상기 주제어부의 I2C 버스를 통한 제어에 따라 해당 LDO출력이 온/오프되어 출력전원이 제어된다. 따라서, 주제어부와 전원제어부간에 기존 I2C버스를 이용하므로 추가적인 GPIO 사용이 불필요하고, 스위칭 트랜지스터 사용이 불필요하여 부품사용이 감소하므로, 구성의 간편해지며 재료비가 절감된다.The present invention relates to a mobile communication terminal having a GPS power management function and a method thereof. The present invention provides an operating clock in an oscillator, a low noise amplifier amplifies a GPS satellite signal, amplifies the RF signal processor RF signal to a predetermined level, and converts the frequency down to a strong analog signal. In the GPS power management method of the mobile communication terminal to convert the digital signal to the digital signal processing unit after converting again, the power management command from the digital signal processing unit to the main control unit via the UART; A main controller receives a UART power management command from the digital signal processor, and directly controls a power controller through an I2C bus; In the power control unit, the corresponding LDO output is turned on / off according to the control through the I2C bus of the main controller to control the output power. Therefore, since the existing I2C bus is used between the main control part and the power control part, additional GPIO is unnecessary, and switching transistors are unnecessary, thereby reducing component use, thereby simplifying configuration and reducing material costs.

GPS, 전원관리, 이동통신, 클럭, 위성, RF, 주파수, UART, I2CGPS, Power Management, Mobile Communications, Clock, Satellite, RF, Frequency, UART, I2C

Description

지피에스 전원관리 기능을 갖는 이동통신 단말기 및 그 방법{Mobile station having GPS power management function and Method thereof}Mobile communication terminal having GPS power management function and method thereof

도 1은 종래 GPS 전원관리 기능을 갖는 이동통신 단말기를 나타낸 블록 구성도.1 is a block diagram showing a mobile communication terminal having a conventional GPS power management function.

도 2는 본 발명에 따른 GPS 전원관리 기능을 갖는 이동통신 단말기를 나타낸 블록 구성도.2 is a block diagram showing a mobile communication terminal having a GPS power management function according to the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

20 : 전원제어부 21 : 발진부20: power control unit 21: oscillation unit

22 : 저잡음증폭기 23 : RF신호 처리부22: low noise amplifier 23: RF signal processing unit

24 : 디지털신호 처리부 25 : 주제어부24: digital signal processing unit 25: main control unit

본 발명은 GPS 기능을 갖는 이동통신 단말기에 관한 것으로서, 보다 상세하게는 주제어부에서 전원제어부의 출력을 직접 제어하여 전원관리를 수행하는 GPS 전원관리 기능을 갖는 이동통신 단말기 및 그 방법에 관한 것이다.The present invention relates to a mobile communication terminal having a GPS function, and more particularly, to a mobile communication terminal and a method having a GPS power management function that performs power management by directly controlling the output of the power control unit in the main controller.

최근의 이동통신 단말기는 GPS(Global Positioning System) 기능을 탑제하여 사용자에게 다양한 위치 정보 서비스를 제공하고 있다. Recently, mobile communication terminals are equipped with a GPS (Global Positioning System) function to provide various location information services to users.

잘 알려진 바와 같이, GPS는 미국방성이 인공위성신호를 이용한 위치추적을 위해, 쏘아올린 인공위성 및 지상의 제어/감시 시스템으로, 24개의 위성으로 전세계를 커버한다. As is well known, GPS is a satellite and ground control / surveillance system launched by the US Department of Defense for location tracking using satellite signals, covering 24 satellites worldwide.

GPS위성은 대략 2만Km상에 위치한 저궤도 위성으로, 정지위성이 아니며, 지구공전 주기는 약 12시간이다. 원래는 군사용이었지만, 현재는 일부 대역의 상용사용이 허용되고 있다. 각각의 GPS위성은 자신의 판별번호, 위치, 신호무결성, 전파환경과 관련된 전리층 정보 등을 담고 있는50bps 항법데이터를 1.023Mhz PN코드에 대역확산하여 1575.42 Mhz 중심주파수로 24시간 지상으로 방송하고 있다. GPS satellites are low-orbiting satellites located at approximately 20,000 km, not geostationary satellites, and have an orbit around 12 hours. Originally for military use, some bands are now commercially available. Each GPS satellite spreads 50bps navigation data containing its identification number, location, signal integrity, and ionospheric information related to the radio environment to 1.023Mhz PN code and broadcasts it 24 hours on the ground at 1575.42 Mhz center frequency.

GPS 제어국 및 감시국은 GPS위성을 운용하고, 최신 데이터를 위성으로 UPLOAD하여 위성신호를 갱신한다. 전세계에 5개의 감시국(Monitor Stataion)과 1개의 주제어국(Master Control Station)이 운영되고 있다. The GPS control station and the monitoring station operate the GPS satellites and update the satellite signals by uploading the latest data to the satellites. Five monitor stations and one master control station are in operation around the world.

GPS 수신기는 GPS위성이 방송하는 신호를 수신하여, 위성신호 수신결과로부터 각 위성들과 수신기 안테나의 의사거리(Pseudo-Range)를 계산하고, 계산된 의사거리가 3개 이상이면, 삼각측량의 원리에 따라, 수신기 안테나의 위치를 계산한다. 계산된 좌표는 ECEF좌표계이며, 이는 GPS에서 사용되는 Global좌표계인, WGS84좌표계로 변환된 후, 한국에서 사용되는 카텍이나 TM좌표계로 변환되어, 지도 데이터로 검색된다.The GPS receiver receives signals from the GPS satellites, calculates pseudo-ranges of the satellites and the receiver antennas from the satellite signal reception results, and if the calculated pseudo distances are three or more, the principle of triangulation According to, calculate the position of the receiver antenna. The calculated coordinate is the ECEF coordinate system, which is converted to the WGS84 coordinate system, which is a global coordinate system used in GPS, and then converted to a Catec or TM coordinate system used in Korea and retrieved as map data.

도 1은 종래의 GPS 전원관리 기능을 갖는 이동통신 단말기를 나타낸 블록 구성도이다.1 is a block diagram illustrating a conventional mobile communication terminal having a GPS power management function.

도시된 바와 같이, GPS 기능을 갖는 이동통신 단말기에 있어서, 전원제어부(PMIC)(10), 스위칭 트랜지시터(11)(12), 저잡음증폭기(LNA; Low Noise Amplifier)(14), RF신호 처리부(15), 디지털신호 처리부(DSP; Digital Signal Processing)(16), 발진부(TCXO)(13)로 구성된다. As shown, in a mobile communication terminal having a GPS function, a power control unit (PMIC) 10, a switching transistor 11, 12, a low noise amplifier (LNA) 14, an RF signal It consists of a processor 15, a digital signal processing (DSP) 16, and an oscillator (TCXO) 13.

상기 디지털신호 처리부(16)에서 저잡음증폭기(14), RF신호 처리부(15), 발진부(13)의 전원제어를 담당한다.The digital signal processor 16 is responsible for power control of the low noise amplifier 14, the RF signal processor 15, and the oscillator 13.

저잡음증폭기(14)는 GPS위성신호를 1.5dB미만의 낮은 노이즈값(Noise Figure)를 가지고 증폭한다. 일반적으로 증폭이득이 13~20dB 사이이며, 캐스캐이드(Cascade) 노이즈값을 낮추어 GPS위성신호의 C/N(Carrier to Noise Ratio)을 개선시키는 역할을 한다.The low noise amplifier 14 amplifies the GPS satellite signal with a low noise figure (less than 1.5 dB). In general, amplification gain is between 13 and 20dB, and lowers the cascade noise to improve the carrier to noise ratio (C / N) of the GPS satellite signal.

RF신호 처리부(15)는 통상의 GPS RF LNA, 믹서(MIXER), ADC(Analog Digital Conversion)을 포함하고 있다. ADC에서의 디지털 변환(Digital Conversion)을 위해, LNA 및 믹서에서 약한 RF신호를 충분히 강한 신호레벨로 증폭시키고. 또한 믹서에서는 주파수 다운 변환(Frequency Down Conversion)을 한다. 그 결과 수GHz의 미약한 반송파에 실려있던 GPS신호가 수Mhz의 강한 아날로그 신호로 변환되어 ADC에 입력된다. ADC는 입력신호를 디지털 변환하여 디지털신호 처리부(16)로 전송한다.The RF signal processor 15 includes a conventional GPS RF LNA, a mixer (MIXER), and an analog digital conversion (ADC). For digital conversion in ADCs, amplify weak RF signals to strong enough signal levels in LNAs and mixers. The mixer also performs frequency down conversion. As a result, the GPS signal on the weak carrier of several GHz is converted into a strong analog signal of several MHz and input to the ADC. The ADC digitally converts the input signal and transmits the digital signal to the digital signal processor 16.

디지털신호 처리부(16)는 RF신호 처리부(15)에서 입력하는 디지털 신호를 입력받아 관계처리(Dump & Correlation)하여 디지털신호 처리부(16) 내부적으로 발생하는 C/A 코드와 코드록(Code lock)을 하고, 그로부터 GPS신호의 코드 페이즈(Code phase)를 측정하여 위성까지의 의사거리(Pseudo-Range)를 계산한다. 또한 GPS신호로부터 네비게이션 데이터 메시지(Navigation Data message)를 디코딩(Decoding)하여, 수신기의 위치를 계산하여 정해진 출력형식에 따라 UART(Universal Asynchronous Receiver Transmitter)나 별도의 데이터 버스(Data Bus)로 출력한다.The digital signal processor 16 receives a digital signal input from the RF signal processor 15 and processes a relationship (Dump & Correlation) to generate a C / A code and code lock generated internally in the digital signal processor 16. From this, the code phase of the GPS signal is measured and the pseudo-range to the satellite is calculated. In addition, the navigation data message is decoded from the GPS signal, the position of the receiver is calculated, and output to a UART (Universal Asynchronous Receiver Transmitter) or a separate data bus according to a predetermined output format.

발진부(13)는 디지털신호 처리부(16)가 슬립(SLEEP)상태에서 웨이크업(WAKEUP)되어 평상시 운영상태(Normal Operating)로 동작할 때, 사용되는 19.2Mhz 클럭(Clock)을 공급한다. 이 클럭 주파수는 하드웨어 구성(Hardware configuration)에 따라 변경 가능하다.The oscillator 13 provides a 19.2Mhz clock clock which is used when the digital signal processor 16 wakes up from the sleep state and operates in a normal operating state. This clock frequency can be changed depending on the hardware configuration.

주제어부(Cell phone modem 또는 MSM; Mobile Station Modem)(17)는 단말기의 중앙처리장치로 디지털신호 처리부(16)에서 전송하는 수신기의 위치 및 GPS정보를 전송 받아 사용자 어플리케이션에 사용한다. 또한GPS와 관련해서, 시스템의 동작모드를 제어하고, 전원제어부(10)를 제어한다.The main control unit (Cell phone modem or MSM) 17 receives the position and GPS information of the receiver transmitted from the digital signal processor 16 to the central processing unit of the terminal and uses the same in a user application. In addition, in relation to the GPS, the operation mode of the system is controlled, and the power supply control unit 10 is controlled.

전원제어부(10)는 내부에 다수의 LDO(Low Drop Out)를 가지고 있고, 특정 LDO에 대한 콘트롤 입력을 받을 수 있는 전원공급 및 관리전용의 IC이다. 주제어부(17)로부터 I2C버스를 통해 제어된다. 주제어부(17)의 제어의 결과로 전원제어부(10) 내부의 특정 LDO가 온/오프되며 공급전압이 변경된다.The power control unit 10 has a plurality of low drop outs (LDOs) therein, and is an IC dedicated to power supply and management capable of receiving a control input for a specific LDO. It is controlled from the main controller 17 via the I2C bus. As a result of the control of the main controller 17, the specific LDO inside the power supply controller 10 is turned on / off and the supply voltage is changed.

I2C 데이터 버스는 데이터, 클록의 2선으로 통신되는 직렬통신 방법으로, 클록이 가해지는 동안 데이터에 입력되는 로직값이 전송된다. 하나의 데이터 신호로 송수신을 겸용하며, I2C 디바이스는 고유의 어드레스값을 가지고 있어, 하나의 I2C버스를 여러 개의 I2C 디바이스가 공유할 수 있다.The I2C data bus is a serial communication method in which two lines of data and a clock are communicated, and logic values input to the data are transmitted while the clock is applied. Transmitting / receiving as a single data signal, the I2C device has a unique address value, so that multiple I2C devices can share one I2C bus.

상기 디지털신호 처리부(16)에 의한 전원관리 제어를 살펴보면, 디지털신호 처리부(16)로부터 WAKEUP, RFPWRUP, LNA_EN 신호가 출력되어 스위칭 트랜지시터(11)(12)를 온/오프 시킴으로써 각각 디지털신호 처리부(16) 자신과 RF신호 처리부(15), 저잡음증폭기(14), 발진부(13)의 전원을 온/오프 제어한다.Looking at the power management control by the digital signal processor 16, the WAKEUP, RFPWRUP, LNA_EN signals are output from the digital signal processor 16 to turn on / off the switching transistors 11 and 12 respectively. (16) On / off control of the power supply of itself and the RF signal processing unit 15, the low noise amplifier 14, and the oscillation unit 13 is performed.

디지털신호 처리부(16)는 UART를 통해 주제어부(17)로 GPS신호 수신에 필요한 데이터를 수신 받고 결과를 송신하면서, 자체적으로 GPS 시스템의 전원관리를 수행한다.The digital signal processor 16 receives the data necessary for receiving the GPS signal to the main controller 17 through the UART and transmits the result, and performs power management of the GPS system by itself.

그러나, 상술한 바와 같은 종래의 GPS 전원관리 기능을 갖는 이동통신 단말기에 의하면, 디지털신호 처리부에서 전원관리를 담당하므로 주제어부에서 별도의 전원관리를 해줄 필요가 없는 반면, 디지털신호 처리부에서 GPIO 출력을 통해 전원관리를 하므로, 회로배선을 해야 하는 불편함과, GPIO출력값이 전원공급장치의 콘트롤 입력에 적합하지 않을 때에는, 별도의 스위칭 트랜지스터를 사용해야 하는 문제점이 있었다.However, according to the conventional mobile communication terminal having a GPS power management function as described above, since the digital signal processing unit is in charge of power management, there is no need to perform separate power management in the main control unit, whereas the digital signal processing unit may output the GPIO output. Since power management is carried out, there is a problem in that circuit wiring is inconvenient, and when a GPIO output value is not suitable for a control input of a power supply device, a separate switching transistor has to be used.

따라서, 본 발명은 상기한 종래의 문제점을 해결하기 위하여 안출된 것으로, 디지털신호 처리부에서 UART를 통하여 필요한 전원제어를 주제어부에 요청하고, 주제어부에서 전원제어부의 출력을 직접 제어하여 GPS 시스템의 전원관리를 수행하는 GPS 전원관리 기능을 갖는 이동통신 단말기 및 그 방법을 제공하는 데에 그 목적이 있다.Accordingly, the present invention has been made to solve the above-described problems, the digital signal processing unit requests the main power to the necessary power control through the UART, the main control unit directly controls the output of the power control unit to power the GPS system It is an object of the present invention to provide a mobile communication terminal having a GPS power management function for performing management and a method thereof.

상기한 목적을 달성하기 위한 본 발명에 따른 GPS 전원관리 기능을 갖는 이동통신 단말기는, 발진부에서 동작 클럭을 공급하고, 저잡음증폭기는 GPS위성신호를 증폭하며, RF신호 처리부 RF신호를 소정 레벨로 증폭시켜 주파수 다운 변환함으로써, 미약한 반송파에 실려있던 GPS신호를 강한 아날로그 신호로 변환한 후, 다시 디지털 변환하여 디지털신호 처리부로 전송하는 GPS 전원관리 기능을 갖는 이동통신 단말기에 있어서, 주제어부로 UART를 통해 전원관리 명령을 전달하는 디지털신호 처리부; 상기 디지털신호 처리부로부터 UART 전원관리 명령을 전달받고, I2C 버스를 통하여 전원제어부를 직접 제어하는 주제어부; 및 상기 주제어부의 I2C 버스를 통한 제어에 따라 해당 LDO출력이 온/오프되어 출력전원이 제어되는 전원제어부를 구비하는 것을 특징으로 한다.The mobile communication terminal having a GPS power management function according to the present invention for achieving the above object, the operation clock is supplied from the oscillator, the low noise amplifier amplifies the GPS satellite signal, the RF signal processor RF signal amplified to a predetermined level In the mobile communication terminal having a GPS power management function which converts a GPS signal carried by a weak carrier to a strong analog signal and then converts the digital signal to a digital signal processor by converting the frequency down, the UART is the main control unit. A digital signal processor for transmitting a power management command; A main controller which receives a UART power management command from the digital signal processor and directly controls a power controller through an I2C bus; And a power controller configured to control the output power by turning on / off the corresponding LDO output according to the control through the I2C bus of the main controller.

상기 디지털신호 처리부는; WAKEUP 또는 RFPWRUP 신호가 출력되어야 할 각각의 상황에 따라 UART를 통해, WAKEUP Request UART 명령과 RFPWRUP Request UART 명령을 선택적으로 상기 주제어부로 전송하는 것이 바람직하다.The digital signal processor; It is preferable to selectively transmit a WAKEUP Request UART command and an RFPWRUP Request UART command to the main control part through the UART according to each situation in which a WAKEUP or RFPWRUP signal is to be output.

또한, 본 발명에 따른 이동통신 단말기의 GPS 전원관리 방법은, 발진부에서 동작 클럭을 공급하고, 저잡음증폭기는 GPS위성신호를 증폭하며, RF신호 처리부 RF신호를 소정 레벨로 증폭시켜 주파수 다운 변환함으로써, 미약한 반송파에 실려있던 GPS신호를 강한 아날로그 신호로 변환한 후, 다시 디지털 변환하여 디지털신호 처리부로 전송하는 이동통신 단말기의 GPS 전원관리방법에 있어서, 디지털신호 처리부에서 주제어부로 UART를 통해 전원관리 명령을 전달하는 단계; 주제어부에서 상기 디지털신호 처리부로부터 UART 전원관리 명령을 전달받고, I2C 버스를 통하여 전원제어부를 직접 제어하는 단계; 및 전원제어부에서 상기 주제어부의 I2C 버스를 통한 제어에 따라 해당 LDO출력이 온/오프되어 출력전원이 제어되는 단계로 이루어진 것을 특징으로 한다.In addition, the GPS power management method of the mobile communication terminal according to the present invention, by supplying the operation clock from the oscillator, a low noise amplifier amplifies the GPS satellite signal, by amplifying the RF signal processing unit RF signal to a predetermined level, frequency down conversion, In the GPS power management method of a mobile communication terminal which converts a GPS signal carried by a weak carrier into a strong analog signal, and then digitally converts and transmits the digital signal to a digital signal processing unit, the power management command from the digital signal processing unit to the main control unit through the UART. Delivering; Receiving a UART power management command from the digital signal processor in a main controller and directly controlling a power controller through an I2C bus; And controlling the output power by turning on / off the corresponding LDO output according to the control via the I2C bus of the main controller.

또한, 상기 디지털신호 처리부에서 WAKEUP 또는 RFPWRUP 신호가 출력되어야 할 각각의 상황에 따라 UART를 통해, WAKEUP Request UART 명령과 RFPWRUP Request UART 명령을 선택적으로 상기 주제어부로 전송하는 단계를 더 포함하는 것이 더욱 바람직하다.The digital signal processor may further include selectively transmitting a WAKEUP Request UART command and an RFPWRUP Request UART command to the main control unit through a UART according to a situation in which a WAKEUP or RFPWRUP signal is to be output. .

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명에 따른 GPS 전원관리 기능을 갖는 이동통신 단말기를 나타낸 블록 구성도이다.2 is a block diagram illustrating a mobile communication terminal having a GPS power management function according to the present invention.

도시된 바와 같이 본 발명은, 전원제어부(20), 발진부(21), 저잡음증폭기(22), RF신호 처리부(23), 디지털신호 처리부(24), 주제어부(25)로 구성된다. As shown, the present invention includes a power supply control unit 20, an oscillator 21, a low noise amplifier 22, an RF signal processor 23, a digital signal processor 24, and a main controller 25.

발진부(21)는 디지털신호 처리부(24)가 동작할 때, 사용되는 19.2Mhz 클럭(Clock)을 공급하고, 저잡음증폭기(22)는 GPS위성신호를 증폭하며, RF신호 처리부(23)는 RF신호를 소정 레벨로 증폭시켜 주파수 다운 변환함으로써, 미약한 반송파에 실려있던 GPS신호를 강한 아날로그 신호로 변환한 후, 다시 디지털 변환하여 디지털신호 처리부(24)로 전송한다.The oscillator 21 supplies a 19.2 MHz clock clock which is used when the digital signal processor 24 operates, the low noise amplifier 22 amplifies the GPS satellite signal, and the RF signal processor 23 transmits the RF signal. By amplifying the signal to a predetermined level and converting the frequency down, the GPS signal carried by the weak carrier wave is converted into a strong analog signal, and then digitally converted and transmitted to the digital signal processor 24.

디지털신호 처리부(24)는 주제어부(25)로 UART를 통해 전원관리 명령을 전달하되, WAKEUP, RFPWRUP 신호가 출력되어야 할 상황에 UART를 통해, WAKEUP Request UART 명령과 RFPWRUP Request UART 명령을 주제어부(25)로 전송한다.The digital signal processing unit 24 transmits a power management command to the main control unit 25 through the UART, and outputs a WAKEUP Request UART command and an RFPWRUP Request UART command through the UART when a WAKEUP or RFPWRUP signal is to be output. 25).

주제어부(25)는 상기 디지털신호 처리부(24)로부터 UART 전원관리 명령을 전달받고, I2C 버스를 통하여 전원제어부(20)를 직접 제어한다.The main controller 25 receives the UART power management command from the digital signal processor 24 and directly controls the power controller 20 through the I2C bus.

전원제어부(20)는 상기 주제어부(25)의 I2C 버스를 통한 제어에 따라 해당 LDO출력이 온/오프되어 출력전원이 제어된다.The power controller 20 controls the output power by turning on / off the corresponding LDO output according to the control of the main controller 25 through the I2C bus.

이와 같이 구성된 본 발명의 작용을 더욱 상세히 설명하면 다음과 같다.Referring to the operation of the present invention configured in this way in more detail as follows.

도 2에 도시된 바와 같이, 먼저 발진부(21)는 디지털신호 처리부(24)가 동작할 때 즉, 슬립(SLEEP)상태에서 웨이크업(WAKEUP)되어 평상시 운영상태(Normal Operating)로 동작할 때, 사용되는 19.2Mhz 클럭(Clock)을 공급한다.As shown in FIG. 2, first, when the digital signal processing unit 24 operates, that is, when the digital signal processing unit 24 operates, ie, wakes up from a sleep state and operates in a normal operating state, Supply the 19.2Mhz clock used.

저잡음증폭기(22)는 GPS위성신호를 1.5dB미만의 낮은 노이즈값(Noise Figure)를 가지고 증폭한다. 일반적으로 증폭이득이 13~20dB 사이이며, 캐스캐이드(Cascade) 노이즈값을 낮추어 GPS위성신호의 C/N(Carrier to Noise Ratio)을 개선시키는 역할을 한다.The low noise amplifier 22 amplifies the GPS satellite signal with a low noise figure (less than 1.5 dB). In general, amplification gain is between 13 and 20dB, and lowers the cascade noise to improve the carrier to noise ratio (C / N) of the GPS satellite signal.

RF신호 처리부(23)는 RF신호를 소정 레벨로 증폭시켜 주파수 다운 변환함으로써, 미약한 반송파에 실려있던 GPS신호를 강한 아날로그 신호로 변환한 후, 다시 디지털 변환하여 디지털신호 처리부(24)로 전송한다. The RF signal processor 23 amplifies the RF signal to a predetermined level and down-converts the signal, thereby converting the GPS signal contained in the weak carrier into a strong analog signal, and then digitally converts it to the digital signal processor 24. .

이를 위하여 상기 RF신호 처리부(23)는 통상의 GPS RF LNA, 믹서(MIXER), ADC(Analog Digital Conversion)을 포함하고 있다. ADC에서의 디지털 변환(Digital Conversion)을 위해, LNA 및 믹서에서 약한 RF신호를 충분히 강한 신호레벨로 증폭시키고. 또한 믹서에서는 주파수 다운 변환(Frequency Down Conversion)을 한다. 그 결과 수GHz의 미약한 반송파에 실려있던 GPS신호가 수Mhz의 강한 아날로그 신호로 변환되어 ADC에 입력된다. ADC는 입력신호를 디지털 변환하여 디지털신호 처리부(24)로 전송한다.For this purpose, the RF signal processor 23 includes a conventional GPS RF LNA, a mixer (MIXER), and an analog digital conversion (ADC). For digital conversion in ADCs, amplify weak RF signals to strong enough signal levels in LNAs and mixers. The mixer also performs frequency down conversion. As a result, the GPS signal on the weak carrier of several GHz is converted into a strong analog signal of several MHz and input to the ADC. The ADC digitally converts the input signal and transmits the digital signal to the digital signal processor 24.

이후, 디지털신호 처리부(24)에서 주제어부(25)로 UART를 통해 전원관리 명령을 전달하면, 주제어부(25)는 전원제어부(20)와 연결된 I2C 버스를 통해, 출력전원을 직접 제어하여 전원관리를 수행한다.Thereafter, when the digital signal processor 24 transmits a power management command to the main control unit 25 through the UART, the main control unit 25 directly controls the output power through the I2C bus connected to the power control unit 20. Perform management.

여기서, 상기 주제어부(25)에 의한 전원관리 제어를 살펴보면, 디지털신호 처리부(24)로부터 WAKEUP, RFPWRUP 신호가 출력되어야 할 상황에, UART를 통해, WAKEUP Request UART 명령과 RFPWRUP Request UART 명령이 주제어부(25)로 전송된다.Here, referring to the power management control by the main control unit 25, the WAKEUP Request UART command and the RFPWRUP Request UART command through the UART in the situation that the WAKEUP, RFPWRUP signal should be output from the digital signal processing unit 24, the main control unit Is sent to 25.

주제어부(25)는 상기 UART 명령을 전송 받은후, I2C 버스를 통해, 전원제어부(20)의 해당 LDO출력을 온/오프 시킴으로써, 전원제어부(20)의 출력전원을 직접 제어하여 GPS 시스템의 전원관리를 수행한다.After the main control unit 25 receives the UART command, the LDO output of the power control unit 20 is turned on / off through the I2C bus to directly control the output power of the power control unit 20 to power the GPS system. Perform management.

이상에서는 본 발명의 바람직한 실시예에 대하여 도시하고 또한 설명하였으나 본 발명은 상기한 실시예에 한정되지 아니하며, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 본 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능할 것이다.Although the above has been illustrated and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the general knowledge in the field to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Anyone with a variety of variations will be possible.

이상에서 설명한 바와 같이 본 발명에 따른 GPS 전원관리 기능을 갖는 이동통신 단말기 및 그 방법에 의하면, 디지털신호 처리부에서 UART를 통하여 필요한 전원제어를 주제어부에 요청하고, 주제어부에서 전원제어부의 출력을 직접 제어하 여 GPS 시스템의 전원관리를 수행함으로써, 주제어부와 전원제어부간에 기존 I2C버스를 이용하므로, 추가적인 GPIO 사용이 불필요하고, 스위칭 트랜지스터 사용이 불필요하여 부품사용이 감소하므로, 구성의 간편해지며 재료비가 절감되는 효과가 있다.As described above, according to the mobile communication terminal having the GPS power management function and the method according to the present invention, the digital signal processing unit requests the main power control unit to perform the necessary power control through the UART, and directly outputs the power control unit output from the main control unit. By controlling power management of the GPS system, the existing I2C bus is used between the main control part and the power control part, thus eliminating the use of additional GPIOs and eliminating the use of switching transistors. There is a saving effect.

Claims (4)

GPS(Global Positioning System)신호 수신을 위한 RF신호처리부를 포함하는 GPS시스템이 탑재된 이동통신 단말기에 있어서,A mobile communication terminal equipped with a GPS system including an RF signal processor for receiving a GPS (Global Positioning System) signal, 상기 GPS시스템의 각 구성요소에 공급되는 전원을 선택적으로 온/오프하는 전원제어부와;A power control unit for selectively turning on / off power supplied to each component of the GPS system; 상기 RF신호처리부로 수신된 상기 GPS신호를 처리하여 GPS기능을 수행하고 상기 GPS시스템의 전원관리를 위한 GPS 전원관리 명령신호를 출력하는 디지털신호 처리부와;A digital signal processor for processing the GPS signal received by the RF signal processor to perform a GPS function and output a GPS power management command signal for power management of the GPS system; 상기 디지털신호 처리부가 출력하는 상기 GPS 전원관리 명령신호에 따라 상기 GPS시스템의 각 구성요소에 공급되는 전원이 선택적으로 온/오프되도록 상기 전원제어부를 제어하는 주제어부를 포함하는 것을 특징으로 하는 GPS 전원관리 기능을 갖는 이동통신 단말기.And a main control unit controlling the power control unit to selectively turn on / off the power supplied to each component of the GPS system according to the GPS power management command signal output by the digital signal processing unit. Mobile communication terminal having a function. 제 1항에 있어서, The method of claim 1, 상기 디지털신호 처리부는;The digital signal processor; 상기 GPS 전원관리 명령신호를 UART(Universal Asynchronous Receiver Transmitter)방식으로 상기 주제어부에 전달하는 것을 특징으로 하는 GPS 전원관리 기능을 갖는 이동통신 단말기.And a GPS power management command signal transmitted to the main control unit by a UART (Universal Asynchronous Receiver Transmitter) method. GPS신호 수신을 위한 RF신호처리부와, 상기 RF신호처리부로 수신된 상기 GPS신호를 처리하여 GPS기능을 수행하는 디지털신호처리부와, 시스템의 각 구성요소에 공급되는 전원을 선택적으로 온/오프하는 전원제어부를 포함하는 GPS시스템이 탑재된 이동통신 단말기의 GPS 전원관리방법에 있어서,RF signal processing unit for receiving a GPS signal, a digital signal processing unit for performing a GPS function by processing the GPS signal received by the RF signal processing unit, and power to selectively turn on / off the power supplied to each component of the system In the GPS power management method of a mobile communication terminal equipped with a GPS system including a control unit, 상기 디지털신호 처리부가 상기 GPS시스템의 전원관리를 위한 GPS 전원관리 명령신호를 출력하는 단계;Outputting, by the digital signal processor, a GPS power management command signal for power management of the GPS system; 주제어부에서 상기 GPS 전원관리 명령신호에 따라 상기 GPS시스템의 각 구성요소에 공급되는 전원이 선택적으로 온/오프되도록 상기 전원제어부를 제어하는 단계를 포함하는 것을 특징으로 하는 이동통신 단말기의 GPS 전원관리방법.And controlling the power control unit to selectively turn on / off the power supplied to each component of the GPS system according to the GPS power management command signal at the main control unit. Way. 제 3항에 있어서,The method of claim 3, wherein 상기 디지털신호 처리부가 상기 GPS시스템의 전원관리를 위한 GPS 전원관리 명령신호를 출력하는 단계는,The digital signal processing unit outputs a GPS power management command signal for power management of the GPS system, 상기 디지털신호 처리부에서 상기 GPS 전원관리 명령신호를 UART(Universal Asynchronous Receiver Transmitter)방식으로 상기 주제어부에 전달하는 단계인 것을 특징으로 하는 이동통신 단말기의 GPS 전원관리방법.And transmitting, by the digital signal processor, the GPS power management command signal to the main controller in a UART (Universal Asynchronous Receiver Transmitter) method.
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