KR20010027309A - Transmition device of mobile station - Google Patents

Transmition device of mobile station Download PDF

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Publication number
KR20010027309A
KR20010027309A KR1019990039009A KR19990039009A KR20010027309A KR 20010027309 A KR20010027309 A KR 20010027309A KR 1019990039009 A KR1019990039009 A KR 1019990039009A KR 19990039009 A KR19990039009 A KR 19990039009A KR 20010027309 A KR20010027309 A KR 20010027309A
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KR
South Korea
Prior art keywords
signal
transmission
automatic gain
level
control signal
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KR1019990039009A
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Korean (ko)
Inventor
조정욱
김홍칠
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박종섭
현대전자산업 주식회사
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Priority to KR1019990039009A priority Critical patent/KR20010027309A/en
Publication of KR20010027309A publication Critical patent/KR20010027309A/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • 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
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B2001/0408—Circuits with power amplifiers
    • H04B2001/0416—Circuits with power amplifiers having gain or transmission power control

Abstract

PURPOSE: A transmitting device for a mobile communication terminal is provided so that power consumption of a power amplifier can be reduced by automatically controlling a gain of the power amplifier according to a transmission level of an RF signal. CONSTITUTION: An MSM(Mobile Station Manager)(100) decides a transmission level of an RF signal by detecting a reception level of the RF signal, and outputs an automatic gain control signal to an automatic gain controller(200) and an OP-amplifier(800). The automatic gain controller(200) receives an audio signal and the automatic gain control signal, automatically controls the gain of the audio signal according to the level of the automatic gain control signal, and outputs the resultant signal to an up-mixer(400). A voltage control generator(300) outputs a carrier oscillation frequency to the up-mixer(400). The up-mixer(400) receives the audio signal and the carrier oscillation frequency, and generates an RF audio signal. A driving amplifier(500) receives the RF audio signal from the up-mixer(400), amplifies it to a predetermined level and outputs it to a band-pass filter(600). The band-pass filter(600) receives the RF audio signal from the driving amplifier(700), amplifies it by transmission power, and outputs the resulting signal to a duplexer. The OP-amplifier(800) receives the automatic gain control signal from the MSM(100), compares it with the reference voltage signal, and outputs a bias voltage control signal to the power amplifier(700) according to the level of the automatic gain control signal.

Description

이동통신 단말기의 송신장치{TRANSMITION DEVICE OF MOBILE STATION}Transmission device of mobile communication terminal {TRANSMITION DEVICE OF MOBILE STATION}

본 발명은 이동통신 단말기의 송신장치에 관한 것으로, 특히, 전력 증폭기(Power Amplifire)의 이득(Gain)을 무선주파수(Radio Frequency; 이하 RF라 칭함.) 신호의 송신레벨(Transmition Level)에 상응하도록 자동으로 조절해 줌으로 전력 증폭기의 효율을 향상시켜 주기 위한 이동통신 단말기의 송신장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission apparatus of a mobile communication terminal. In particular, a gain of a power amplifier corresponds to a transmission level of a radio frequency (hereinafter referred to as RF) signal. The present invention relates to a transmission apparatus of a mobile communication terminal for automatically adjusting and improving the efficiency of a power amplifier.

일반적인 이동통신 단말기의 송신장치는 도 1에 도시한 바와 같이, RF 신호의 수신레벨을 검출한 후 이에 상응하는 송신용 자동이득 제어신호를 출력하는 MSM(Mobile Station Manager; 이하 MSM이라 칭함.)(1)과; 상기 MSM(1)에서 출력한 송신용 자동이득 제어신호의 레벨에 따라 송신용 음성신호의 이득을 조절해 주는 자동이득 제어기(Automatic Gain Controller)(2)와; 반송파 발진주파수를 발생시키는 전압제어 발진기(3)와; 상기 자동이득 제어기(2)에서 출력한 송신용 음성신호와 상기 전압제어 발진기(3)에서 출력한 반송파 발진주파수를 서로 혼합시켜 RF 음성신호를 생성하는 업-믹서(Up-Mixer)(4)와; 상기 업-믹서(4)에서 출력한 RF 음성신호를 증폭하는 구동 증폭기(Drive Amplifire)(5)와; 상기 구동 증폭기(4)에서 RF 음성신호를 입력받아 송신전력만큼 증폭시키는 전력 증폭기(6) 등으로 구성되어 있었다.As shown in FIG. 1, a transmitter of a general mobile communication terminal detects a reception level of an RF signal and outputs a corresponding automatic gain control signal for transmission (hereinafter referred to as MSM). 1) and; An automatic gain controller (2) for adjusting the gain of the transmission audio signal according to the level of the transmission automatic gain control signal output from the MSM (1); A voltage controlled oscillator 3 for generating a carrier oscillation frequency; An up-mixer 4 for generating an RF voice signal by mixing the transmission voice signal output from the automatic gain controller 2 and the carrier oscillation frequency output from the voltage controlled oscillator 3 with each other; ; A drive amplifier 5 for amplifying the RF voice signal output from the up-mixer 4; The power amplifier 6 receives the RF voice signal from the driving amplifier 4 and amplifies the transmission power by the transmission power.

그러나, 종래 이동통신 단말기의 송신장치내에 장착된 전력 증폭기는 항상 이득이 일정값으로 고정되어 있었기 때문에, 구동 증폭기에서 출력한 RF 음성신호를 입력받은 후 항상 동일한 이득으로 전력증폭시켜 줌으로써, RF 신호의 송신레벨이 낮을 경우 전력 증폭기의 불필요한 전류가 많이 소모되게 되어 효율이 저하될 뿐만 아니라, 이로인한 배터리(Battery) 소모량이 증대되어 단말기의 통화 사용시간이 단축되는 문제점이 있었다.However, the power amplifier mounted in the transmitter of the conventional mobile communication terminal has always had a fixed fixed gain. Therefore, after receiving the RF audio signal output from the driving amplifier, the power amplifier is always amplified with the same gain, thereby providing the RF signal. When the transmission level is low, the unnecessary current of the power amplifier is consumed a lot, and the efficiency is lowered. As a result, battery consumption is increased, thereby reducing the talk time of the terminal.

따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 이루어진 것으로서, 본 발명의 목적은 전력 증폭기의 전류소모를 줄여 효율을 증대시킴과 동시에 이로인한 배터리 사용시간을 늘려 통화시간을 연장시켜 주기 위한 이동통신 단말기의 송신장치를 제공하는 데 있다.Therefore, the present invention has been made to solve the conventional problems as described above, an object of the present invention is to increase the efficiency by reducing the current consumption of the power amplifier and at the same time to extend the talk time to thereby increase the battery life The present invention provides a transmission device for a mobile communication terminal.

상기와 같은 목적을 달성하기 위하여 본 발명 이동통신 단말기의 송신장치는, RF 신호의 수신레벨을 검출하여 RF 신호의 송신레벨을 결정한 후, 이에 상응하는 송신용 자동이득 제어신호를 출력하는 MSM과; 송신측 전단 블록으로 부터 송신용 음성신호를 입력받은 후, 상기 MSM에서 출력한 송신용 자동이득 제어신호의 레벨에 따라 그 송신용 음성신호의 이득을 자동으로 조절해 주는 자동이득 제어기와; 반송파 발진주파수를 발생시키는 전압제어 발진기와; 상기 자동이득 제어기에서 출력한 송신용 음성신호와 상기 전압제어 발진기에서 출력한 반송파 발진주파수를 서로 혼합시켜 RF 음성신호를 생성하는 업-믹서와; 상기 업-믹서에서 RF 음성신호를 입력받아 송신전력만큼 증폭시킨 후 출력하는 전력 증폭기와; 상기 MSM에서 송신용 자동이득 제어신호를 입력받은 후 기준전압 신호와 비교하여, 그 송신용 자동이득 제어신호의 레벨에 상응하는 전력증폭기 이득조절용 바이어스전압 제어신호를 상기 전력 증폭기로 발생시켜 주는 OP-엠프로 구성된 것을 특징으로 한다.In order to achieve the above object, a transmitter of a mobile communication terminal includes: an MSM for detecting a reception level of an RF signal to determine a transmission level of the RF signal, and outputting a corresponding automatic gain control signal for transmission; An automatic gain controller which automatically adjusts the gain of the transmission audio signal according to the level of the transmission automatic gain control signal output from the MSM after receiving the transmission audio signal from the transmission front block; A voltage controlled oscillator for generating a carrier oscillation frequency; An up-mixer for generating an RF voice signal by mixing the transmission voice signal output from the automatic gain controller and the carrier oscillation frequency output from the voltage controlled oscillator; A power amplifier which receives the RF voice signal from the up-mixer and amplifies it by the transmission power and outputs the amplified signal; OP- which generates a power amplifier gain control bias voltage control signal corresponding to the level of the automatic gain control signal for transmission to the power amplifier after receiving the automatic gain control signal for transmission from the MSM and comparing it with a reference voltage signal. Characterized in that it consists of an amplifier.

도 1은 일반적인 이동통신 단말기의 송신장치의 구성을 나타낸 기능블록도,1 is a functional block diagram showing the configuration of a transmission apparatus of a general mobile communication terminal;

도 2는 본 발명의 일 실시예에 따른 이동통신 단말기의 송신장치의 구성을 나타낸 기능블록도이다.2 is a functional block diagram showing a configuration of a transmission apparatus of a mobile communication terminal according to an embodiment of the present invention.

＜도면의 주요 부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

100 : MSM 200 : 자동이득 제어기100: MSM 200: automatic gain controller

300 : 전압제어 발진기 400 : 업-믹서300: voltage controlled oscillator 400: up-mixer

500 : 구동 증폭기 600 : 송신측 밴드패스 필터500: drive amplifier 600: transmit bandpass filter

700 : 전력 증폭기 800 : OP-엠프700: power amplifier 800: OP-amp

이하, 본 발명의 일 실시예에 의한 이동통신 단말기의 송신장치에 대하여 첨부된 도면을 참조하여 상세히 설명하기로 한다.Hereinafter, a transmission apparatus of a mobile communication terminal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 의한 이동통신 단말기의 송신장치의 기능블록도로서, 본 발명의 일 실시예에 의한 이동통신 단말기의 송신장치는 MSM(100), 자동이득 제어기(200), 전압제어 발진기(300), 업-믹서(400), 구동 증폭기(500), 송신측 밴드패스 필터(Band Pass Filter)(600), 전력 증폭기(700), OP-엠프(Operational Amplifier)(800)로 구성되어 있다.2 is a functional block diagram of a transmitter of a mobile communication terminal according to an embodiment of the present invention, the transmitter of the mobile communication terminal according to an embodiment of the present invention is the MSM (100), automatic gain controller 200, Voltage controlled oscillator 300, up-mixer 400, drive amplifier 500, transmit side band pass filter 600, power amplifier 700, OP-amp 800 Consists of

상기 MSM(100)은 도시치 않은 안테나(Antenna)를 통해 수신된 RF 신호의 수신레벨을 검출하여 RF 신호의 송신레벨을 결정한 후, 이에 상응하는 송신용 자동이득 제어신호를 상기 자동이득 제어기(200) 및 OP-엠프(800)로 출력하는 역할을 한다.The MSM 100 determines the transmission level of the RF signal by detecting the reception level of the RF signal received through an antenna (not shown), and then transmits the corresponding automatic gain control signal for transmission to the automatic gain controller 200. ) And the OP-AMP 800.

한편, 상기 자동이득 제어기(200)는 송신측 전단 블록으로 부터 송신용 음성신호를 입력받음과 동시에 상기 MSM(100)에서 출력한 송신용 자동이득 제어신호를 입력받아, 그 송신용 자동이득 제어신호의 레벨에 따라 그 송신용 음성신호의 이득을 자동으로 조절한 후 상기 업-믹서(400)로 출력하는 역할을 한다.On the other hand, the automatic gain controller 200 receives the transmission audio signal from the front-end block of the transmission and at the same time receives the transmission automatic gain control signal output from the MSM 100, the transmission automatic gain control signal It automatically adjusts the gain of the transmission voice signal according to the level of the output to the up-mixer (400).

또한, 상기 전압제어 발진기(300)는 반송파 발진주파수를 발생시킨 후 상기 업-믹서(400)로 출력하는 역할을 한다.In addition, the voltage controlled oscillator 300 generates a carrier oscillation frequency and serves to output the up-mixer 400.

한편, 상기 업-믹서(400)는 상기 자동이득 제어기(200)에서 출력한 송신용 음성신호와 상기 전압제어 발진기(300)에서 출력한 반송파 발진주파수를 입력받은 후, 서로 혼합시킴으로 RF 음성신호를 생성하는 역할을 한다.Meanwhile, the up-mixer 400 receives an RF voice signal by mixing a transmission voice signal output from the automatic gain controller 200 and a carrier oscillation frequency output from the voltage controlled oscillator 300 and then mixing them with each other. It creates a role.

또한, 상기 구동 증폭기(500)는 상기 업-믹서(400)에서 출력한 RF 음성신호를 입력받아 일정 레벨만큼 증폭한 후 상기 송신측 밴드패스 필터(600)로 출력하는 역할을 한다.In addition, the driving amplifier 500 receives an RF voice signal output from the up-mixer 400 and amplifies the RF voice signal by a predetermined level, and outputs the result to the transmitting bandpass filter 600.

한편, 상기 송신측 밴드패스 필터(600)는 상기 구동 증폭기(500)를 통해 증폭된 RF 음성신호를 입력받아, 해당 주파수 밴드만을 필터링한 후 상기 전력 증폭기(700)로 출력하는 역할을 한다.Meanwhile, the transmitting bandpass filter 600 receives the RF voice signal amplified by the driving amplifier 500, filters only the frequency band, and outputs the RF voice signal to the power amplifier 700.

또한, 상기 전력 증폭기(700)는 상기 송신측 밴드패스 필터(600)에서 출력한 RF 음성신호를 입력받아, 송신전력만큼 증폭시킨 후 도시치 않은 듀플렉서(Duplexer)로 출력하는 역할을 한다.In addition, the power amplifier 700 receives the RF voice signal output from the transmission bandpass filter 600, amplifies the transmission power, and outputs the result to a duplexer (not shown).

한편, 상기 OP-엠프(800)는 상기 MSM(100)에서 출력한 송신용 자동이득 제어신호를 입력받은 후 기준전압 신호와 비교하여, 그 송신용 자동이득 제어신호의 레벨에 상응하는 바이어스전압 제어신호를 상기 전력 증폭기로 발생시켜 줌으로, 상기 전력 증폭기(700)의 증폭이득을 RF 수신신호의 레벨에 상응하도록 조절해 주는 역할을 한다.On the other hand, the OP-AMP 800 receives the transmission auto gain control signal output from the MSM 100 and compares it with a reference voltage signal to control the bias voltage corresponding to the level of the transmission auto gain control signal. By generating a signal to the power amplifier, it controls the amplification gain of the power amplifier 700 to correspond to the level of the RF received signal.

그러면, 상기와 같은 구성을 가지는 이동통신 단말기의 송신장치의 동작과정에 대해 도 2를 참조하여 설명하기로 한다.Next, an operation process of the transmitter of the mobile communication terminal having the above configuration will be described with reference to FIG. 2.

먼저, 상기 MSM(100)은 안테나를 통해 수신된 RF 신호의 수신레벨을 검출하여 RF 신호의 송신레벨을 결정한 후, 이에 상응하는 송신용 자동이득 제어신호를 상기 자동이득 제어기(200) 및 OP-엠프(800)로 출력한다.First, the MSM 100 detects the reception level of the RF signal received through the antenna to determine the transmission level of the RF signal, and then transmits the corresponding auto gain control signal for transmission to the auto gain controller 200 and OP−. Output to the amplifier 800.

그러면, 상기 자동이득 제어기(200)는 송신측 전단 블록으로 부터 송신용 음성신호를 입력받음과 동시에 상기 MSM(100)에서 출력한 송신용 자동이득 제어신호를 입력받아, 그 송신용 음성신호의 이득을 그 송신용 자동이득 제어신호의 레벨에 따라 자동으로 조절한 후 상기 업-믹서(400)로 출력한다.Then, the automatic gain controller 200 receives the transmission audio signal from the front end block of the transmission side, receives the transmission automatic gain control signal output from the MSM 100, and gains the transmission audio signal. Is automatically adjusted according to the level of the automatic gain control signal for transmission and then output to the up-mixer 400.

한편, 상기 전압제어 발진기(300)는 반송파 발진주파수를 발생시켜 상기 업-믹서(400)로 출력한다.On the other hand, the voltage controlled oscillator 300 generates a carrier oscillation frequency and outputs it to the up-mixer 400.

그러면, 상기 업-믹서(400)는 상기 자동이득 제어기(200)에서 출력한 송신용 음성신호와 상기 전압제어 발진기(300)에서 출력한 반송파 발진주파수를 입력받은 후 서로 혼합시킴으로 RF 음성신호를 생성하고, 이후 그 RF 음성신호를 상기 구동 증폭기(500)로 출력한다.Then, the up-mixer 400 receives the transmission voice signal output from the automatic gain controller 200 and the carrier oscillation frequency output from the voltage controlled oscillator 300 and generates an RF voice signal by mixing with each other. The RF voice signal is then output to the driving amplifier 500.

이어서, 상기 구동 증폭기(500)는 상기 업-믹서(400)에서 출력한 RF 음성신호를 입력받아, 일정 레벨만큼 증폭한 후 상기 송신측 밴드패스 필터(600)로 출력한다.Subsequently, the driving amplifier 500 receives the RF voice signal output from the up-mixer 400, amplifies the RF voice signal by a predetermined level, and outputs the RF voice signal to the transmitting bandpass filter 600.

그러면, 상기 송신측 밴드패스 필터(600)는 상기 구동 증폭기(500)를 통해 증폭된 RF 음성신호를 입력받아, 해당 주파수 밴드만을 필터링한 후 상기 전력 증폭기(700)로 출력한다.Then, the transmitting band pass filter 600 receives the RF voice signal amplified by the driving amplifier 500, filters only the corresponding frequency band, and outputs the RF voice signal to the power amplifier 700.

이때, 상기 OP-엠프(800)는 상기 MSM(100)에서 출력한 송신용 자동이득 제어신호를 입력받은 후 기준전압 신호와 비교하여, 그 송신용 자동이득 제어신호의 레벨에 상응하는 바이어스전압 제어신호를 상기 전력 증폭기로 발생시켜 준다.At this time, the OP-AMP 800 receives a transmission auto gain control signal output from the MSM 100 and compares it with a reference voltage signal to control a bias voltage corresponding to the level of the transmission auto gain control signal. Signal to the power amplifier.

그러면, 상기 전력 증폭기(700)의 이득은 상기 OP-엠프(800)에서 출력한 바이어스전압 제어신호에 의해 RF 신호의 송신레벨에 상응하도록 자동으로 조절된다.Then, the gain of the power amplifier 700 is automatically adjusted to correspond to the transmission level of the RF signal by the bias voltage control signal output from the OP-AMP 800.

그런후, 상기 전력 증폭기(700)는 상기 송신측 밴드패스 필터(600)에서 출력한 RF 음성신호를 입력받아, RF 신호의 송신레벨에 상응하도록 조절된 이득만큼 전력증폭시킨 후 듀플렉서로 출력한다.Then, the power amplifier 700 receives the RF voice signal output from the transmission bandpass filter 600, amplifies the power by a gain adjusted to correspond to the transmission level of the RF signal, and outputs the duplexer.

따라서, 상술한 바와 같이 상기 전력 증폭기(700)의 이득이 RF 신호의 송신레벨에 상응하도록 연속적으로 변화됨으로써, 상기 전력 증폭기(700)의 불필요한 전류가 소모되지 않아 효율이 향상되게 되는 것이다.Therefore, as described above, the gain of the power amplifier 700 is continuously changed to correspond to the transmission level of the RF signal, so that unnecessary current of the power amplifier 700 is not consumed, thereby improving efficiency.

상술한 바와 같이 본 발명에 의한 이동통신 단말기의 송신장치에 의하면, 전력 증폭기의 이득을 RF 신호의 송신레벨에 상응하도록 자동으로 조절해 줌으로써 전력 증폭기의 불필요한 전류소모를 줄여줄 수 있기 때문에 전력증폭기의 효율이 향상될 뿐만 아니라, 이로인한 배터리 사용시간의 증대로 단말기의 통화시간이 연장된다는 뛰어난 효과가 있다.As described above, according to the transmitter of the mobile communication terminal according to the present invention, since the gain of the power amplifier is automatically adjusted to correspond to the transmission level of the RF signal, unnecessary current consumption of the power amplifier can be reduced. Not only is the efficiency improved, but there is an excellent effect that the talk time of the terminal is prolonged by the increase of the battery usage time.

Claims (1)

RF 신호의 수신레벨을 검출하여 RF 신호의 송신레벨을 결정한 후, 이에 상응하는 송신용 자동이득 제어신호를 출력하는 MSM과; 송신측 전단 블록으로 부터 송신용 음성신호를 입력받은 후, 상기 MSM에서 출력한 송신용 자동이득 제어신호의 레벨에 따라 그 송신용 음성신호의 이득을 자동으로 조절해 주는 자동이득 제어기와; 반송파 발진주파수를 발생시키는 전압제어 발진기와; 상기 자동이득 제어기에서 출력한 송신용 음성신호와 상기 전압제어 발진기에서 출력한 반송파 발진주파수를 서로 혼합시켜 RF 음성신호를 생성하는 업-믹서와; 상기 업-믹서에서 RF 음성신호를 입력받아 송신전력만큼 증폭시킨 후 출력하는 전력 증폭기와; 상기 MSM에서 송신용 자동이득 제어신호를 입력받은 후 기준전압 신호와 비교하여, 그 송신용 자동이득 제어신호의 레벨에 상응하는 전력증폭기 이득조절용 바이어스전압 제어신호를 상기 전력 증폭기로 발생시켜 주는 OP-엠프로 구성된 것을 특징으로 하는 이동통신 단말기의 송신장치.An MSM for detecting a reception level of the RF signal to determine a transmission level of the RF signal and then outputting a corresponding automatic gain control signal for transmission; An automatic gain controller which automatically adjusts the gain of the transmission audio signal according to the level of the transmission automatic gain control signal output from the MSM after receiving the transmission audio signal from the transmission front block; A voltage controlled oscillator for generating a carrier oscillation frequency; An up-mixer for generating an RF voice signal by mixing the transmission voice signal output from the automatic gain controller and the carrier oscillation frequency output from the voltage controlled oscillator; A power amplifier which receives the RF voice signal from the up-mixer and amplifies it by the transmission power and outputs the amplified signal; OP- which generates a power amplifier gain control bias voltage control signal corresponding to the level of the automatic gain control signal for transmission to the power amplifier after receiving the automatic gain control signal for transmission from the MSM and comparing it with a reference voltage signal. Transmitter of a mobile communication terminal, characterized in that configured as an amplifier.
KR1019990039009A 1999-09-13 1999-09-13 Transmition device of mobile station KR20010027309A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100425713B1 (en) * 2001-10-26 2004-04-03 엘지전자 주식회사 Automatic calibration apparatus and method for mobile communication device
KR100438442B1 (en) * 2001-10-27 2004-07-03 삼성전자주식회사 Apparatus of automatic gain control of mobile station

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100425713B1 (en) * 2001-10-26 2004-04-03 엘지전자 주식회사 Automatic calibration apparatus and method for mobile communication device
KR100438442B1 (en) * 2001-10-27 2004-07-03 삼성전자주식회사 Apparatus of automatic gain control of mobile station

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