KR20020049746A - Power detector in the mobile communication terminal - Google Patents

Power detector in the mobile communication terminal Download PDF

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Publication number
KR20020049746A
KR20020049746A KR1020000079027A KR20000079027A KR20020049746A KR 20020049746 A KR20020049746 A KR 20020049746A KR 1020000079027 A KR1020000079027 A KR 1020000079027A KR 20000079027 A KR20000079027 A KR 20000079027A KR 20020049746 A KR20020049746 A KR 20020049746A
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South Korea
Prior art keywords
communication terminal
mobile communication
signal
power
transmission
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KR1020000079027A
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Korean (ko)
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김성겸
윤병기
한주열
김민철
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송문섭
주식회사 큐리텔
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Priority to KR1020000079027A priority Critical patent/KR20020049746A/en
Publication of KR20020049746A publication Critical patent/KR20020049746A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
    • H04B17/102—Power radiated at antenna
    • 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
    • H04B1/44—Transmit/receive switching

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transceivers (AREA)

Abstract

PURPOSE: An apparatus for detecting a power in a mobile communication terminal is provided to stably detect a transmission power outputted from the mobile communication terminal without directly connecting to a transmission path and being influenced to the transmission path by detecting the power using a photo LED and a photo detector. CONSTITUTION: A duplexer(11) simultaneously performs transmission and receipt functions to an RF(Radio Frequency) signal of a mobile communication terminal. An MSM(Mobile Station Modem)(12) controls an entire operation of the mobile communication terminal. An IFT(Intermediate Frequency Transceiver)(13) converts a transmitting IF signal into an RF signal to process the RF signal, and performs an AGC(Automatic Gain Control) function for uniformly maintaining a transmission power outputted from the mobile communication terminal. A power amplifier(14) amplifies a power of the RF signal processed in the IFT(13) through the transmission path and outputs the amplified RF signal to the duplexer(11). A power detecting device(15) detects the transmission power outputted from the mobile communication terminal using the strength and weakness of the light emitted from a photo LED, and outputs the result to the IFT(13).

Description

이동통신 단말기내 전력 검출장치 {POWER DETECTOR IN THE MOBILE COMMUNICATION TERMINAL}Power detection device in mobile communication terminal {POWER DETECTOR IN THE MOBILE COMMUNICATION TERMINAL}

본 발명은 이동통신 단말기내 전력 검출장치에 관한 것으로, 특히 포토 LED(Photo Light Emitting Diode)와 포토 검출기(Photo Detector)를 이용하여 송신 경로상의 회로에 영향을 주지 않고 안전하게 이동통신 단말기에서 출력되는 송신전력을 검출할 수 있도록 한 이동통신 단말기내 전력 검출장치에 관한 것이다.The present invention relates to a power detection device in a mobile communication terminal, and in particular, using a photo LED (Photo Light Emitting Diode) and a photo detector (Photo Detector), the transmission is safely output from the mobile communication terminal without affecting the circuit on the transmission path The present invention relates to a power detection device in a mobile communication terminal capable of detecting power.

도 1에 도시된 바와 같이 듀플렉서(Duplexer)(1), MSM(Mobile Station Modem)(2), IFT(Intermediate Frequency Transceiver)(3), 전력 증폭기(PowerAmplifier)(4)를 포함하여 구성되는 종래 이동통신 단말기는 전력 검출 다이오드(Power Detection Diode)(6)와 루프 필터(Loop Filter)(7)로 이루어진 전력 검출장치(5)를 구비하고, 이를 송신 경로(Tx Path)상에 직접 연결하고 있다.As shown in FIG. 1, a conventional mobile device includes a duplexer 1, a mobile station modem (MSM) 2, an intermediate frequency transceiver (IFT) 3, and a power amplifier 4. The communication terminal is provided with a power detection device 5 consisting of a power detection diode 6 and a loop filter 7, which are connected directly on a transmission path.

즉, 상기 전력 검출장치(5)는 듀플렉서(1)와 전력 증폭기(4) 사이에 연결되어 이동통신 단말기에서 출력되는 송신전력을 검출한다.That is, the power detection device 5 is connected between the duplexer 1 and the power amplifier 4 to detect the transmission power output from the mobile communication terminal.

상기와 같이 구성된 종래 이동통신 단말기내 전력 검출장치(5)는 상기 전력 검출 다이오드(6)를 통해 상기 전력 증폭기(4)에서 출력되는 송신신호의 전력을 검출하여 전압으로 변환하고, 이어 루프 필터(7)를 통해 일정한 레벨의 직류(DC) 전압을 생성한다.The conventional power detection device 5 in the mobile communication terminal configured as described above detects the power of the transmission signal output from the power amplifier 4 through the power detection diode 6 and converts it into a voltage, followed by a loop filter ( 7) generates a constant level of direct current (DC) voltage.

이후, IFT(3)는 상기 루프 필터(7)에서 생성된 직류(DC) 전압 레벨에 따라 AGC(Automatic Gain Control)를 조절하여 일정한 송신전력을 유지할 수 있도록 한다.Thereafter, the IFT 3 adjusts AGC (Automatic Gain Control) according to the DC voltage level generated by the loop filter 7 to maintain a constant transmission power.

그러나, 종래에는 상기와 같이 이동통신 단말기내 전력 검출장치(5)가 송신 경로상에 직접 연결되어 있기 때문에 주변 회로에게 적지 않은 악영향을 끼쳐 RF 송수신 경로상에서의 신호간 미스매치(Mismatch) 및 경로 손실(Path Loss)을 야기시키게 되는 문제점이 있었다.However, in the related art, since the power detection device 5 in the mobile communication terminal is directly connected on the transmission path as described above, there are many adverse effects on the peripheral circuits, and thus mismatch and path loss between signals on the RF transmission / reception path. There was a problem that caused (Path Loss).

본 발명은 상기와 같은 문제점을 해결하기 위한 것으로서, 그 목적은 포토 LED와 포토 검출기를 이용한 전력 검출장치를 구현하여 송신 경로상에 직접 연결하지 않으면서 송신 경로상의 회로에 영향을 주지 않고 안전하게 이동통신 단말기에서 출력되는 송신전력을 검출할 수 있도록 한 이동통신 단말기내 전력 검출장치를 제공하는 데에 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to implement a power detection device using a photo LED and a photo detector to safely communicate without affecting the circuits on the transmission path without directly connecting the transmission path. The present invention provides a power detection device in a mobile communication terminal capable of detecting a transmission power output from a terminal.

도 1은 종래 이동통신 단말기내 전력 검출장치의 블록 구성도,1 is a block diagram of a power detection device in a conventional mobile communication terminal;

도 2는 본 발명에 의한 이동통신 단말기내 전력 검출장치의 블록 구성도.2 is a block diagram of a power detection device in a mobile communication terminal according to the present invention;

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

15 : 전력 검출장치16 : 비교기15 power detection device 16 comparator

PL : 포토 LEDPD : 포토 검출기PL: Photo LEDPD: Photo Detector

R1,R2 : 저항C1 : 캐패시터R1, R2: Resistor C1: Capacitor

상기와 같은 목적을 달성하기 위한 본 발명의 이동통신 단말기내 전력 검출장치는, 안테나 쪽에 배치되어 송신 경로상의 강한 송신신호를 크기에 따라 빛의 강약으로 나타내는 포토 LED와, 상기 포토 LED에서 나타난 빛의 강약을 검출하여 전기적인 신호를 발생하는 포토 검출기와, OP-앰프로 구성되어, 상기 포토 검출기에서 발생된 전기적인 신호에 의한 전압과 이동통신 단말기에서 출력되는 PDM 신호에 의한 전압을 비교하여 직류 전압을 IFT로 발생하는 비교기로 이루어지는 것을 특징으로 한다.The apparatus for detecting power in a mobile communication terminal of the present invention for achieving the above object includes a photo LED disposed on an antenna side and indicating a strong transmission signal on a transmission path as intensity of light according to size, and the light represented by the photo LED. A photo detector which detects strength and weakness and generates an electrical signal, and an OP-amp, compares the voltage of the electrical signal generated by the photo detector with the voltage of the PDM signal output from the mobile communication terminal. It characterized in that consisting of a comparator generated by the IFT.

이하, 첨부된 도면을 참고하여 본 발명에 의한 이동통신 단말기내 전력 검출장치의 구성 및 동작을 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the power detection device in a mobile communication terminal according to the present invention.

도 2는 본 발명에 의한 이동통신 단말기내 전력 검출장치의 블록 구성도로서, 안테나(Ant)에 연결되어 이동통신 단말기의 RF신호에 대한 송수신 기능을 동시에 수행하는 듀플렉서(11)와, 이동통신 단말기의 전체적인 동작을 제어하는 MSM(12)과, 송신할 IF신호를 RF신호로 변환하여 처리하고, 이동통신 단말기에서 출력되는 송신전력을 일정하게 유지하도록 AGC 기능을 수행하는 IFT(13)와, 송신 경로를 통과하는 상기 IFT(13)에서 처리된 RF신호의 전력을 증폭하여 상기 듀플렉서(11)로 출력하는 전력 증폭기(14)와, 상기 안테나(Ant) 쪽에 포토 LED를 배치하고, 이 포토 LED에서 나타나는 빛의 강약으로 이동통신 단말기에서 출력되는송신전력을 검출하여 그 결과를 상기 IFT(13)로 출력하는 전력 검출장치(15)를 포함하여 구성된다.2 is a block diagram of an apparatus for detecting power in a mobile communication terminal according to the present invention. The duplexer 11 is connected to an antenna and simultaneously performs a transmission / reception function for an RF signal of a mobile communication terminal. MSM 12 for controlling the overall operation of the signal, IFT 13 for performing the AGC function to convert the IF signal to be transmitted into an RF signal, and to maintain the transmission power output from the mobile communication terminal, and transmission. A power amplifier 14 for amplifying the power of the RF signal processed by the IFT 13 passing through the path and outputting the power to the duplexer 11, and a photo LED is disposed on the antenna side, and in the photo LED And a power detection device 15 for detecting the transmission power output from the mobile communication terminal with the intensity of the appearing light and outputting the result to the IFT 13.

상기 전력 검출장치(15)는 상기 안테나(Ant) 쪽에 배치되어 송신 경로상의 강한 송신신호를 크기에 따라 빛의 강약으로 나타내는 포토 LED(PL)과, 상기 포토 LED(PL)에서 나타난 빛의 강약을 검출하여 전기적인 신호를 발생하는 포토 검출기(PD)와, OP-앰프로 구성되어, 상기 포토 검출기(PD)에서 발생된 전기적인 신호에 의해 저항(R1)에 걸린 전압과 이동통신 단말기에서 전력 제어를 위해 출력되는 PDM(Pulse Density Modulation) 신호가 캐패시터(C1) 통과 후 저항(R2)에 걸린 전압을 비교하여 하이/로우(High/Low) 레벨의 직류(DC) 전압을 상기 IFT(13)로 발생하는 비교기(16)로 구성된다.The power detecting device 15 is disposed on the antenna side to indicate a photo LED (PL) that represents a strong transmission signal on the transmission path according to the magnitude of the intensity, and the intensity of the light displayed on the photo LED (PL). A photo detector (PD) for detecting and generating an electrical signal, and an OP amplifier, the voltage applied to the resistor (R1) by the electrical signal generated from the photo detector (PD) and power control in the mobile communication terminal PDM (Pulse Density Modulation) signal outputted for the capacitor (C1) after passing the voltage applied to the resistor (R2) after comparing the voltage (DC) of the high / low (High / Low) level to the IFT (13) It consists of a comparator 16 generating.

상기와 같이 구성된 본 발명의 이동통신 단말기내 전력 검출장치(15)의 동작을 설명하면 다음과 같다.Referring to the operation of the power detection device 15 in the mobile communication terminal of the present invention configured as described above are as follows.

안테나(Ant)에 연결된 듀플렉서(11)는 이동통신 단말기의 RF신호에 대한 송수신 기능을 동시에 수행하고, MSM(12)은 이동통신 단말기의 전체적인 동작을 제어한다.The duplexer 11 connected to the antenna Ant simultaneously performs the transmission and reception function for the RF signal of the mobile communication terminal, and the MSM 12 controls the overall operation of the mobile communication terminal.

그리고, IFT(13)는 송신할 IF신호를 RF신호로 변환하여 처리하고, 이동통신 단말기에서 출력되는 송신전력을 일정하게 유지하도록 AGC 기능을 수행하며, 전력 증폭기(14)는 송신 경로를 통과하는 상기 IFT(13)에서 처리된 RF신호의 전력을 증폭하여 상기 듀플렉서(11)로 출력한다.In addition, the IFT 13 converts and processes the IF signal to be transmitted into an RF signal, performs an AGC function to keep the transmission power output from the mobile communication terminal constant, and the power amplifier 14 passes through the transmission path. The power of the RF signal processed by the IFT 13 is amplified and output to the duplexer 11.

이때, 수신 경로상에 구비되는 블록 구성은 도면에도 도시하지 않고 설명 역시 생략한다.In this case, the block configuration provided on the reception path is not shown in the drawings and description thereof will be omitted.

상기와 같이 IFT(13)가 AGC 기능을 수행하기 위해서는 이동통신 단말기에서 출력되는 송신전력을 검출해야 한다.As described above, in order for the IFT 13 to perform the AGC function, it is necessary to detect the transmission power output from the mobile communication terminal.

이에 따라, 본 발명에서는 송신 경로상에 직접 연결되어 있지 않은 전력 검출장치(15)를 이용하여 송신전력을 검출한다.Accordingly, in the present invention, the transmission power is detected using the power detection device 15 that is not directly connected on the transmission path.

즉, 전력 검출장치(15)내 포토 LED(PL)는 상기 안테나(Ant) 쪽에 배치되어 송신 경로상의 강한 송신신호를 크기에 따라 빛의 강약으로 나타낸다.That is, the photo LED PL in the power detection device 15 is disposed on the antenna side, and represents the strong transmission signal on the transmission path as the intensity of light according to the magnitude.

그러면, 포토 검출기(PD)는 상기 포토 LED(PL)에서 나타난 빛의 강약을 검출하여 전기적인 신호를 발생한다.Then, the photo detector PD detects the intensity of the light emitted from the photo LED PL and generates an electrical signal.

이어, OP-앰프로 구성된 비교기(16)에서는 상기 포토 검출기(PD)에서 발생된 전기적인 신호에 의해 저항(R1)에 걸린 전압과 이동통신 단말기에서 전력 제어를 위해 출력되는 PDM 신호가 캐패시터(C1) 통과 후 저항(R2)에 걸린 전압을 비교하여 하이/로우 레벨의 직류(DC) 전압을 발생한다.Subsequently, in the comparator 16 configured as an OP-amplifier, the voltage applied to the resistor R1 by the electrical signal generated by the photo detector PD and the PDM signal output for power control from the mobile communication terminal are the capacitors C1. After passing, the voltage applied to the resistor R2 is compared to generate a DC voltage of high / low level.

즉, 상기 포토 검출기(PD)에서 발생된 전기적인 신호에 의한 전압이 이동통신 단말기에서 출력되는 PDM 신호에 의한 전압 보다 크면 하이 레벨의 직류(DC) 전압을, 작으면 로우(DC) 레벨의 직류 전압을 각각 발생하여 상기 IFT(13)로 출력한다.That is, if the voltage due to the electrical signal generated by the photo detector PD is higher than the voltage due to the PDM signal output from the mobile communication terminal, the DC voltage of high level is low, and if the voltage of DC is low, Voltages are respectively generated and output to the IFT 13.

이후, 상기 IFT(13)는 상기 비교기(16)에서 출력된 직류(DC) 전압 레벨에 따라 AGC를 조절하여 이동통신 단말기에서 출력되는 송신전력이 항상 일정하게 유지하도록 한다.Thereafter, the IFT 13 adjusts the AGC according to the DC voltage level output from the comparator 16 so that the transmission power output from the mobile communication terminal is always kept constant.

상기에서 설명한 바와 같이, 본 발명은 포토 LED와 포토 검출기를 이용한 전력 검출장치를 구현함에 따라 송신 경로상에 직접 연결할 필요가 없으며, 이에 따라 송신 경로상의 회로에 영향을 주지 않고 안전하게 이동통신 단말기에서 출력되는 송신전력을 검출할 수 있게 되는 효과가 있다.As described above, the present invention does not need to be directly connected to the transmission path according to the implementation of the power detection device using the photo LED and the photo detector, thereby safely outputting from the mobile communication terminal without affecting the circuit on the transmission path. There is an effect of being able to detect the transmission power that is to be.

Claims (1)

안테나에 연결되어 이동통신 단말기의 RF신호에 대한 송수신 기능을 동시에 수행하는 듀플렉서와, 이동통신 단말기의 전체적인 동작을 제어하는 MSM과, 송신할 IF신호를 RF신호로 변환하여 처리하고, 이동통신 단말기에서 출력되는 송신전력을 일정하게 유지하도록 AGC 기능을 수행하는 IFT와, 송신 경로를 통과하는 상기 IFT에서 처리된 RF신호의 전력을 증폭하여 상기 듀플렉서로 출력하는 전력 증폭기를 포함하여 구성되는 이동통신 단말기에 있어서,A duplexer connected to an antenna and simultaneously performing a transmission / reception function for an RF signal of a mobile communication terminal, an MSM for controlling the overall operation of the mobile communication terminal, and converting and processing an IF signal to be transmitted into an RF signal, And a power amplifier for amplifying the power of the RF signal processed by the IFT passing through the transmission path and outputting the amplified power to the duplexer. In 상기 이동통신 단말기에서 출력되는 송신전력을 검출하기 위한 전력 검출장치가,A power detection device for detecting the transmission power output from the mobile communication terminal, 상기 안테나 쪽에 배치되어 송신 경로상의 강한 송신신호를 크기에 따라 빛의 강약으로 나타내는 포토 LED와,A photo LED disposed on the antenna side and representing a strong transmission signal on a transmission path according to the magnitude of light intensity; 상기 포토 LED에서 나타난 빛의 강약을 검출하여 전기적인 신호를 발생하는 포토 검출기와,A photo detector for detecting an intensity of light emitted from the photo LED and generating an electrical signal; OP-앰프로 구성되어, 상기 포토 검출기에서 발생된 전기적인 신호에 의한 전압과 이동통신 단말기에서 출력되는 PDM 신호에 의한 전압을 비교하여 직류 전압을 상기 IFT로 발생하는 비교기로 이루어지는 것을 특징으로 하는 이동통신 단말기내 전력 검출장치.OP-Amp, characterized in that the movement consisting of a comparator for generating a DC voltage to the IFT by comparing the voltage by the electrical signal generated from the photo detector with the PDM signal output from the mobile communication terminal Power detection device in a communication terminal.
KR1020000079027A 2000-12-20 2000-12-20 Power detector in the mobile communication terminal KR20020049746A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7177659B2 (en) 2002-10-16 2007-02-13 Lg Electronics Inc. Power amplification system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7177659B2 (en) 2002-10-16 2007-02-13 Lg Electronics Inc. Power amplification system and method

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