KR20000067526A - The RF terminal receiption gain reducer controller of mobile communication terminal - Google Patents
The RF terminal receiption gain reducer controller of mobile communication terminal Download PDFInfo
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- KR20000067526A KR20000067526A KR1019990015411A KR19990015411A KR20000067526A KR 20000067526 A KR20000067526 A KR 20000067526A KR 1019990015411 A KR1019990015411 A KR 1019990015411A KR 19990015411 A KR19990015411 A KR 19990015411A KR 20000067526 A KR20000067526 A KR 20000067526A
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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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for
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- Computer Networks & Wireless Communication (AREA)
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
본 발명은 WLL 800MHz단말기에 관한 것으로, 특히 고가의 LNA스위치를 사용하지 않고 오피 앰프와 다이오드를 사용하여 다이오드에 순방향 전압을 인가할 경우 전류에 따라 저항값이 변경되는 특성을 이용하여 수신 IMD특성을 충족시킴으로써 원가와 부품의 절감을 얻을 수 있도록 한 이동통신 단말기의 알 에프단 수신 이득 감쇄기 제어장치 및 방법에 관한 것이다.The present invention relates to a WLL 800MHz terminal, and in particular, when a forward voltage is applied to a diode using an op amp and a diode without using an expensive LNA switch, the received IMD characteristic is changed by using a characteristic in which a resistance value is changed according to a current. The present invention relates to an RF receiver receiving gain attenuator control apparatus and method for a mobile communication terminal, which can reduce cost and parts by satisfying the requirements.
일반적으로 CDMS방식의 단말기는 국제 규격 IS-98의 IMD 특성중 투-톤(Two-Tone)또는 2개의 톤, -32dBm, -21dBm입력시 특성을 충족시키기 위하여 도 1에 도시된 바와같이 듀플렉서(10)를 통하여 수신 RF 앰프(LNA)의 입력단에 다이오드를 이용한 LNA스위치(40)(50)를 사용하여 -95dBm이상의 자기 신호가 인가될 때 단계적으로 가변 감쇄기를 동작시키는 방법으로 투 톤(Two Tone)에 대한 적절한 감쇄를 주어 IS-98의 IMD특성을 충족시키도록 하고 있다.In general, a CDMS type terminal has a duplexer as shown in FIG. 1 to satisfy two-tone or two-tone, -32dBm, -21dBm input characteristics among IMD characteristics of International Standard IS-98. 10) Two-tone (Two Tone) is a method of operating a variable attenuator stepwise when a magnetic signal of -95 dBm or more is applied using a LNA switch 40 or 50 using a diode to an input terminal of a receiving RF amplifier (LNA). By appropriate attenuation, the IMD characteristic of IS-98 is satisfied.
도 1에서 L11,L12는 코일, R11-R14는 저항, C11,C12는 콘덴서이다.In FIG. 1, L11 and L12 are coils, R11-R14 are resistors, and C11 and C12 are capacitors.
즉, 종래의 CDMA방식의 단말기는 국제 규격 IS-98의 IMD특성중 투 원 -32dBm, -21dBm입력시 특성을 충족하기 위해 수신 RF단에 LNA스위치(30)(40) 또는 경로를 별도로 구성하고 있다.That is, the conventional CDMA terminal is configured to separately configure the LNA switch 30, 40 or path in the receiving RF stage to satisfy the characteristics of two-32dBm, -21dBm input of the IMD characteristics of the international standard IS-98 have.
따라서, 종래에는 고가의 LNA스위치(30)(40)를 사용하므로 원가가 증가하고, 별도의 복잡한 감쇄회로를 삽입하여 구조가 복잡하여짐과 함께 휴대용 단말기의 경우 많은 PCB면적을 차지하게 되는 문제가 있었다.Therefore, in the related art, since the LNA switches 30 and 40 are expensive, the cost increases and the structure is complicated by inserting a separate attenuating circuit, and the portable terminal occupies a large PCB area. there was.
본 발명은 이와같은 종래의 문제점을 해결하기 위하여 안출한 것으로, 본 발명의 목적은, 오피 앰프와 다이오드를 사용하여 CDMA단말기의 RF단 수신 이득 감쇄기를 제안함으로써 원가 및 부품을 절감할 수 있는 이동통신 단말기의 알 에프단 수신 이득 감쇄기 제어장치 및 방법을 제공하는데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to propose a RF terminal reception gain attenuator of a CDMA terminal using an op amp and a diode, thereby reducing costs and components. The present invention provides an apparatus and method for controlling RF reception gain attenuator of a terminal.
도 1은 종래의 회로도1 is a conventional circuit diagram
도 2는 본 발명의 알 에프단 수신 이득 감쇄기 제어장치의 회로도2 is a circuit diagram of an RF receive receive attenuator control device of the present invention.
도 3은 본 발명의 동작 흐름도이다3 is an operation flowchart of the present invention.
〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
10:듀플렉서 20:앰프10: duplexer 20: amplifier
30:소 필터 C1-C4:콘덴서30: Small filter C1-C4: Capacitor
R1,R2:저항 D1:다이오드R1, R2: Resistance D1: Diode
L1,L2:코일L1, L2: Coil
이와같은 목적을 달성하기 위한 본 발명의 알 에프단 수신 이득 감쇄기 제어장치는, 안테나를 통하여 신호를 송신 또는 수신하기 위한 듀플렉서, 콘덴서사이에 접속되어 RF신호를 연결 또는 차단하는 다이오드, 듀플렉서의 출력 신호를 소정레벨로 증폭하기 위한 LNA앰프와, LNA앰프의 출력신호중 DC레벨을 차단하기 위한 복수의 콘덴서, 콘덴서를 통한 신호를 필터링하여 다운 컨버터로 보내는 소필터로 구성함을 특징으로 한다.The RF receive gain attenuator control device of the present invention for achieving the above object is a duplexer for transmitting or receiving a signal through an antenna, a diode connected between a capacitor and an output signal of a duplexer to connect or block an RF signal. LNA amplifier for amplifying the signal to a predetermined level, a plurality of capacitors for blocking the DC level of the output signal of the LNA amplifier, and a small filter for filtering the signal through the capacitor to send to the down converter.
본 발명의 알 에프단 수신 이득 감쇄기 제어방법은, 수신 RF입력레벨이 -97dBm이상인가를 판단하여 -97dBm이하일 경우 IF AGC 전압으로 판단하여 RF감쇄단자는 감쇄가 일어나지 않는 상태를 유지하는 단계, -97dBm이상의 RF신호가 수신될 경우 IF AGC단자를 최대로 동작시키는 단계, 로직적으로 RF감쇄단자를 조정하여 감쇄를 수행하는 단계, 수신되는 BBA입력 크기를 판단하여 작을 경우 IF AGC를 업시키고, 클 경우에는 IF AGC를 다운시키며, 적절할 경우에는 RSSI를 판단하여 LCD를 통해 디스플레이하는 단계로 이루어짐을 특징으로 한다.In a method for controlling RF reception gain attenuator according to the present invention, the RF attenuation terminal maintains no attenuation by determining IF AGC voltage when the reception RF input level is -97 dBm or more and -97 dBm or less. When the RF signal of 97dBm or more is received, operate the IF AGC terminal to the maximum, perform the attenuation by adjusting the RF attenuation logic logically, determine the size of the received BBA input, and if it is small, increase the IF AGC. If the IF AGC is down, and if appropriate, it is characterized in that the step of determining the RSSI to display through the LCD.
이하, 본 발명의 실시예를 첨부된 도면을 참고로 하여 상세히 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 회로도로, 안테나를 통하여 신호를 송신 또는 수신하기 위한 듀플렉서(10)와, 콘덴서(C2)(C3)사이에 접속되어 RF신호를 연결 또는 차단하는 다이오드(D1)와, 상기 듀플렉서(10)의 출력 신호를 소정레벨로 증폭하기 위한 LNA앰프(20)와, 상기 LNA앰프(20)의 출력신호중 DC레벨을 차단하기 위한 콘덴서(C2)(C3)와, 상기 콘덴서(C3)를 통한 신호를 필터링하여 다운 컨버터로 보내는 소필터(30)로 구성된 것으로, 도면중 미설명 부호 R1,R2는 저항, L1,L2는 코일, C1은 평활용 콘덴서이다2 is a circuit diagram of the present invention, a diode D1 connected between a duplexer 10 for transmitting or receiving a signal through an antenna, a capacitor C2, and C3 to connect or block an RF signal, and LNA amplifier 20 for amplifying the output signal of the duplexer 10 to a predetermined level, a capacitor (C2) (C3) for blocking the DC level of the output signal of the LNA amplifier 20, and the capacitor (C3) It consists of a small filter (30) for filtering the signal through the down converter, where reference numerals R1, R2 are resistors, L1, L2 are coils, and C1 is a smoothing capacitor.
단, 도면에는 도시되지 않았으나 감쇄회로를 동작시키기 위한 전원공급장치가 구비되어 있다.However, although not shown in the drawing, a power supply for operating the attenuation circuit is provided.
이와같이 구성된 본 발명의 작용을 설명하면 다음과 같다.Referring to the operation of the present invention configured as described above is as follows.
듀플렉서(10)의 단자로 인가된 신호는 다이오드(D1)을 통하여 소정레벨 증폭된다.The signal applied to the terminal of the duplexer 10 is amplified by a predetermined level through the diode D1.
이렇게 증폭된 신호는 콘덴서(C3)(C4)와 소 필터(Saw Filter)(30)를 거쳐 다운 컨버터로 인가되는데 이 신호는 IF로 변환되어 적절한 레벨로 BBA칩으로 인가된다.The amplified signal is applied to the down converter through the capacitors C3 and C4 and the saw filter 30. The signal is converted to IF and applied to the BBA chip at an appropriate level.
이때, IF AGC전압을 인지한 BBA칩은 -97dBm이상이라는 판단에 의하여 LNA감쇄회로를 구동시키며, IMD방해 신호가 인가되어도 자기 신호를 방해없이 해석할 수 있게 된다.At this time, the BBA chip that recognizes the IF AGC voltage drives the LNA attenuation circuit by determining that it is -97dBm or more, and it is possible to analyze the magnetic signal without interruption even if an IMD disturbance signal is applied.
즉, 자기신호 -90dBm과 2개의 -32dBm을 기준으로 설명하면, 자기신호는 -7dB의 손실이 있지만 IMD는 계산식에 의하여 -21dBm의 손실이 있어 복조를 수행하는 BBA칩에서 선택도가 높아져 FER이 좋아진다.In other words, when the magnetic signal is -90dBm and two -32dBm, the magnetic signal has a loss of -7dB, but the IMD has a loss of -21dBm according to the calculation formula. Improves.
한편, 자기신호 -79dBm과 2개의 방해신호 -21dBm을 기준으로 설명하면 자기신호는 -18dBm의 손실이 있지만 IMD는 계산식에 의하여 -54dB의 손실이 있어 복조를 수행하는 BBA칩에서 선택도가 높아져 FER이 좋아진다.On the other hand, when the magnetic signal is -79dBm and two disturbance signals -21dBm, the magnetic signal has a loss of -18dBm, but the IMD has a loss of -54dB by the calculation formula, so the selectivity is increased in the BBA chip that performs demodulation. This gets better.
도 3은 본 발명의 동작흐름도로, RF 신호가 입력되면 로직적으로 IF AGC조정단자와 RF감쇄단자는 BBA의 입력 레벨을 적절하게 조정한다.3 is a flowchart illustrating the operation of the present invention. When an RF signal is input, the IF AGC adjustment terminal and the RF attenuation terminal logically adjust the input level of the BBA.
즉, -97dBm을 IF AGC기준전압으로 설정하기 위하여 설정시 -97dBm을 인가하고 RF 감쇄기 조정단자는 고정한 상태(하이레벨)로 두며 IF AGC전압을 메모리시킨다.That is, to set -97dBm to the IF AGC reference voltage, -97dBm is applied when set, and the RF attenuator adjustment terminal is kept in a fixed state (high level) and the IF AGC voltage is memorized.
이 상태에서 수신 RF입력이 -97dBm이상인가를 판단하여 -97dBm이하의 RF신호가 수신되면, IF AGC 전압으로 판단하여 RF감쇄단자는 감쇄가 일어나지 않는 상태(하이레벨)를 유지한다(S1,S2단계).In this state, if it is determined that the received RF input is more than -97dBm and receives an RF signal of less than -97dBm, the RF attenuation terminal is maintained in a state where no attenuation occurs (high level) by determining the IF AGC voltage (S1, S2). step).
그러나 상기 S1단계에서 -97dBm이상의 RF신호가 수신되면, 이러한 -97dBm이상의 신호는 RF감쇄전압을 로직 파트에서 읽을 수 있으므로 이때는 IF AGC단자를 최대로 동작시킨다(S3단계).However, if the RF signal of more than -97dBm is received in step S1, the signal of more than -97dBm can read the RF attenuation voltage from the logic part, so that the IF AGC terminal is operated at maximum (step S3).
만일, -97dBm이 입력되면 미리 설정한 IF AGC전압이 된다.If -97dBm is input, it becomes the preset IF AGC voltage.
이후, 로직적으로 RF감쇄단자를 조정하여 감쇄가 일어나게 되고 수신 신호가 커질수록 BBA입력 레벨을 적절하게 하기 위하여 계속 감쇄를 진행시킨다(S4단계).Thereafter, attenuation occurs by logically adjusting the RF attenuation terminal, and the attenuation is continuously performed to appropriately adjust the BBA input level as the received signal is increased (step S4).
이때, IF AGC전압은 움직이지 않고 RF감쇄 단자만 조정한다.At this time, the IF AGC voltage does not move and only adjusts the RF attenuation terminal.
또한, 수신되는 BBA입력이 작은가 또는 큰가 또는 적절한가를 판단하여 작을 경우에는 IF AGC를 업(Up)시키고, 클 경우에는 IF AGC를 다운(Down)시키며, 적절할 경우에는 RSSI를 판단하여 LCD를 통해 디스플레이한다(S5-S8단계).Also, if the received BBA input is small or large or appropriate, the IF AGC is up, if it is small, IF AGC is down, and if appropriate, the RSSI is judged and displayed on the LCD. (Step S5-S8).
따라서, 이러한 상태에서 -32dBm IMD신호를 인가하여도 자기신호레벨 -90dBm에서는 IMD감쇄가 21dB가 되므로 특성을 충족시킬 수 있게 되는 것이다.Therefore, even if the -32 dBm IMD signal is applied in this state, the IMD attenuation becomes 21 dB at the magnetic signal level of -90 dBm, so that the characteristics can be satisfied.
이상에서 설명한 바와같은 본 발명은 간단한 회로를 구현하여 감쇄를 자유자재로 조정할 수 있는 것으로, AGC순서에 있어서 RF부를 먼저 감쇄하고, IF AGC 앰프는 나중에 조정하여 IF AGC의 설정된 범위를 벗어날 경우 RF감쇄를 주는 로직 알고리즘을 이용하여 선택도를 향상시킬 수 있는 효과가 있다.As described above, the present invention can freely adjust the attenuation by implementing a simple circuit, and attenuates the RF unit first in the AGC order, and then adjusts the IF AGC amplifier later to move beyond the set range of the IF AGC. It is effective to improve selectivity by using a logic algorithm that gives.
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