KR100252784B1 - Transmitting power control circuit of mobile communication unit - Google Patents

Transmitting power control circuit of mobile communication unit Download PDF

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KR100252784B1
KR100252784B1 KR1019960080890A KR19960080890A KR100252784B1 KR 100252784 B1 KR100252784 B1 KR 100252784B1 KR 1019960080890 A KR1019960080890 A KR 1019960080890A KR 19960080890 A KR19960080890 A KR 19960080890A KR 100252784 B1 KR100252784 B1 KR 100252784B1
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South Korea
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signal
agc
stage
input
transmitting
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KR1019960080890A
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Korean (ko)
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KR19980061519A (en
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이창진
양철모
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김덕중
사단법인 고등기술연구원 연구조합
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/10Monitoring; Testing of transmitters
    • H04B17/11Monitoring; Testing of transmitters for calibration
    • H04B17/13Monitoring; Testing of transmitters for calibration of power amplifiers, e.g. gain or non-linearity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/20Monitoring; Testing of receivers
    • H04B17/24Monitoring; Testing of receivers with feedback of measurements to the transmitter

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

Abstract

PURPOSE: A circuit for controlling a transmission output in a mobile communication device is provided to remove an error, and to decrease a level gain deviation by equipping a duplexer filter at an input stage and an output stage of an AGC(Automatic Gain Control) circuit. CONSTITUTION: A duplexer filter(5) receives input frequencies of a receive IF stage and an input frequency a transmit IF stage, and mixes a transmitting and receiving signal. At this time, the input frequencies of the receive IF stage and the input frequency of a transmit IF stage are different each other. An AGC(Automatic Gain Control) amp receives the mixed signal, and amplifies the mixed signal to a wanted value. After this, the AGC amp(6) transmits the mixed signal to another duplexer filter(5), and operates an AGC(7) by separating some part of the mixed signal. Another duplexer filter(5) separates the transmitting and receiving signal. Another duplexer filter(5) controls a transmission output by transmitting the separated transmitting signal to a transmit IF output and transmitting the separated receiving signal to a receive IF input.

Description

이동통신기기의 송신출력 제어회로Transmission output control circuit of mobile communication device

본 발명은 이동통신용 단말기 또는 기지국의 송신출력을 제어회로에 관한 것으로, 특히 단말기와 단말기, 단말기와 기지국 상호간의 송신출력의 과다로 발생하는 간섭으로 인한 신호의 왜곡을 방지하기 위하여 이동통신기기의 RF단 수신경로상에 존재하는 AGC 회로의 동작에 송신출력을 연동시켜 RF 송신출력을 제어하는 회로에 관한 것이다.The present invention relates to a control circuit for the transmission output of a mobile communication terminal or a base station, and in particular, to prevent distortion of a signal due to interference caused by excessive transmission output between the terminal and the terminal, the terminal and the base station. However, the present invention relates to a circuit for controlling the RF transmission output by linking the transmission output to the operation of the AGC circuit existing on the reception path.

일반적으로 이동통신기기에 있어서, 이동통신용 단말기 또는 기지국 상호간의 신호세기의 차이로 인한 간섭으로 신호의 왜곡이 발생되는 것을 방지하기 위하여 송신출력을 제어하여 단말기와 단말기, 또는 단말기와 기지국 간의 신호세기를 일정하게 유지시킨다.In general, in a mobile communication device, a signal output between a terminal and a terminal or a terminal and a base station is controlled by controlling a transmission output in order to prevent distortion of the signal due to interference due to a difference in signal strength between the mobile terminal or the base station. Keep it constant

도1은 종래의 이동통신기기에서 베이스밴드(Baseband) 신호처리부에서 RSSI(Received Signal Strength Indicator) 신호를 분석해 디지탈 신호로 송신출력을 제어하는 회로를 나타낸 것으로서, RF의 수신경로에서 IF단의 일부신호를 검파다이오드에 의하여 DC전압으로 검파를 실시하고, 검파된 신호를 OP 앰프(3)에서 기준전압(Vref)과 비교증폭하여 RSSI신호를 만든다. 상기 RSSI신호는 베이스밴드(Baseband) 신호처리부(4)에 입력되어 분석에 의해 디지탈 신호를 발생시키고, 상기 베이스밴드로부터 발생된 디지탈 신호는 디지탈 감쇠기(2)를 제어하여 신호레벨을 변화시킴으로써, 파워증폭기(1)에서 송신되는 송신출력을 제어하는 장치를 나타낸 것이다.FIG. 1 is a circuit diagram of a conventional base station signal processor analyzing a RSSI signal to control a transmission output using a digital signal, and a part of an IF stage signal in an RF reception path. Is detected by the detection diode with a DC voltage, and the detected signal is compared and amplified by the OP amplifier 3 with the reference voltage Vref to generate an RSSI signal. The RSSI signal is input to a baseband signal processor 4 to generate a digital signal by analysis, and the digital signal generated from the baseband is controlled by changing the signal level by controlling the digital attenuator 2. A device for controlling the transmission output transmitted from the amplifier 1 is shown.

일반적인 이동통신기기에 있어서는 이동통신용 단말기 또는 기지국 상호간의 신호세기의 차이로 인한 간섭으로 신호의 왜곡이 발생되는 것을 방지하기 위하여 송신출력을 제어하였다. 그러나 도1에 도시된 바와 같이 종래의 송신출력을 제어하는 장치는 수신신호의 세기를 구분하는 RSSI를 베이스밴드 신호처리부에서 분석을 통해 송신출력을 제어함으로, 여러단계를 거쳐야 하기 때문에 장치의 구성이 복잡하고, RF 수신단에서 디지탈 신호의 변경시 오차가 생기며, 여러단계의 처리절차를 거쳐야 한다는 문제점이 있었다.In a general mobile communication device, a transmission output is controlled to prevent distortion of a signal due to interference due to a difference in signal strength between a mobile communication terminal or a base station. However, as shown in FIG. 1, the conventional apparatus for controlling the transmission output is controlled by the baseband signal processor to analyze the transmission output through RSSI, which distinguishes the strength of the received signal. It is complicated, and there is a problem in that an error occurs when the digital signal is changed in the RF receiver, and it has to go through several steps.

또한 송신전력을 제어하기 위해 별도의 가변이득 증폭기를 필요로 한다는문제점이 있었다.In addition, there is a problem in that a separate variable gain amplifier is required to control the transmission power.

따라서 본 발명은 이동통신기기의 RF 단 수신경로상에 존재하는 AGC 회로의 동작에 송신신호를 연동시켜 송신출력을 제어하는 회로를 구성함으로써 종래의 전력제어 방식의 송신출력 제어회로에서 발생하던 오차를 제거하고, 송신전력 제어를 위한 신호처리용 DSP 회로의 추가 없이 수신신호의 레벨에 따라 송신신호를 제어하는 것을 목적으로한다.Accordingly, the present invention configures a circuit for controlling the transmission output by linking the transmission signal to the operation of the AGC circuit existing on the RF terminal reception path of the mobile communication device. It is aimed at eliminating and controlling the transmission signal according to the level of the received signal without the addition of a signal processing DSP circuit for transmission power control.

도1은 종래의 이동통신기기의 베이스밴드(Baseband) 신호 처리부에서 수신 RSSI 신호를 분석한 후 디지탈 신호로 송신출력을 제어하는 회로도.1 is a circuit diagram of controlling a transmission output by a digital signal after analyzing a received RSSI signal in a baseband signal processing unit of a conventional mobile communication device.

도2는 본 발명에 따른 이동통신기기에서 수신단의 AGC 회로를 이용하여 송신단의 송신출력을 제어하는 회로도.Figure 2 is a circuit diagram for controlling the transmission output of the transmitting end using the AGC circuit of the receiving end in the mobile communication device according to the present invention.

도3A 내지 도3F는 본 발명에 따른 송신출력 제어회로를 이용하여 제어되는송수신 주파수의 출력을 나타낸 그래프.3A-3F are graphs showing the output of a transmit / receive frequency controlled using a transmit power control circuit in accordance with the present invention.

<도면의 주요부분에 대한 설명><Description of main parts of drawing>

1 : 파워 증폭기 2 : 디지탈 감쇄기1: power amplifier 2: digital attenuator

3 : OP 앰프 4 : 베이스 밴드 신호처리부3: OP amplifier 4: Baseband signal processor

5 : 듀플렉스 필터 6 : AGC 앰프5: duplex filter 6: AGC amplifier

7 : AGC7: AGC

본 발명은 이동통신기기 상호간의 간섭으로 인한 신호의 왜곡을 방지하기 위하여 수신경로상에 존재하는 AGC회로의 동작에 송신신호의 출력을 연동시켜 RF 송신출력을 제어하는 회로에 관한 것이다The present invention relates to a circuit for controlling the RF transmission output by interlocking the output of the transmission signal with the operation of the AGC circuit existing on the reception path in order to prevent distortion of the signal due to interference between mobile communication devices.

이하, 첨부된 도면을 참조하여 본 발명을 더욱 상세히 설명하기로 한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도2는 본발명에 따른 송신출력 제어회로를 나타낸 것으로, RF 수신단의 AGC 앰프(6)와 AGC(7)에 두 개의 듀플렉스 필터(5)가 연결되어 있는 구조를 가진다. 좀더 자세히 설명하면. 수신 IF단의 입력 주파수(도3A)와 송신 IF단의 입력주파수(도3B)를 각각 다르게 구성하여 IF단 회로의 듀플렉서 필터(5)에 입력하여 송수신 신호를 믹싱하고(도3C), 상기 믹싱된 신호를 AGC 앰프(6)에 입력시켜 제어하고자 하는 값으로 증폭시킨다. 다음에 상기 증폭된 송수신 신호(도3D)를 또다른 듀플렉스 필터(5)에 입력시키고, AGC 앰프(6)에서 수신신호중 일부를 분리하여 AGC(7)를 동작시킨다. 상기 증폭된 송수신 신호를 입력한 또다른 듀플렉스 필터(5)는 송수신 신호를 분리하여 송신신호(도3F)를 송신 IF출력으로보내고, 분리된 수신신호(도3E)는 AGC(7)로부터 들어오는 신호와 함께 수신 IF 입력으로 전송함으로써 송신출력을 제어하게 된다. 이때 상기 AGC 증폭기의 증폭도는 수신IF신호의 감도에 의해 변화되는데, 수신IF신호가 낮으면 증폭도를 크게하고 수신IF신호가 높으면 증폭도를 낮춘다. 결국 함께 입력된 송신IF신호의 이득도 함께 연동되기 때문에 수신IF신호의 전력과 송신IF신호의 전력의 합은 항상 일정하게 유지되는 것이다.2 shows a transmission output control circuit according to the present invention, in which two duplex filters 5 are connected to an AGC amplifier 6 and an AGC 7 of an RF receiver. In more detail. The input frequency (FIG. 3A) of the receiving IF stage and the input frequency (FIG. 3B) of the transmitting IF stage are configured differently and input to the duplexer filter 5 of the IF stage circuit to mix the transmit / receive signals (FIG. 3C). The signal is input to the AGC amplifier 6 and amplified to the value to be controlled. Next, the amplified transmit / receive signal (FIG. 3D) is input to another duplex filter 5, and a part of the received signal is separated from the AGC amplifier 6 to operate the AGC 7. Another duplex filter 5 which inputs the amplified transmit / receive signal separates the transmit / receive signal and sends the transmit signal (FIG. 3F) to the transmit IF output. Transmit output is controlled by sending to the receive IF input. At this time, the amplification degree of the AGC amplifier is changed by the sensitivity of the received IF signal. If the received IF signal is low, the amplification degree is increased, and if the received IF signal is high, the amplification degree is decreased. As a result, since the gain of the input IF signal is also linked together, the sum of the power of the received IF signal and the power of the transmitted IF signal is always kept constant.

상술한 바와 같이 본 발명은 이동통신기기의 RF수신단에 존재하는 AGC 회로의 입력단과 출력단에 듀플렉서 필터를 설치하여 송수신 신호를 연동시켜 송신출력을 제어함으로써 종래의 송신출력을 제어하기 이한 신호인 RSSI를 추출하는 과정과 A/D 과정에서 일어나는 에러를 없앨 수 있으며, 송수신단의 레벨 이득 편차를 ±1dB 이내로 조정하는 것이 가능하다. 또한 베이스 밴드쪽에 송신출력을 제어하기 위한 신호처리부를 없앨수 있어 회로의 전류소비를 줄일수 있고, RF 송신단에 전력제어용 파워앰프가 필요없다.As described above, the present invention provides a duplexer filter at an input terminal and an output terminal of an AGC circuit existing in an RF receiving terminal of a mobile communication device, interlocks a transmission / reception signal, and controls a transmission output so as to control RSSI, which is a signal for controlling a conventional transmission output. It is possible to eliminate the errors in the extraction process and A / D process, and it is possible to adjust the level gain deviation of the transmitter and the receiver within ± 1dB. In addition, the signal processing unit for controlling the transmission output can be eliminated on the baseband side, thereby reducing the current consumption of the circuit, and eliminating the need for a power control power amplifier at the RF transmitting end.

Claims (1)

수신 IF 입력신호와 송신 IF입력 신호를 받아 합성하는 듀플렉서 필터와,A duplexer filter for receiving and synthesizing the received IF input signal and the transmitted IF input signal; 상기 듀플렉서 필터에서 합성된 송수신 출력신호를 증폭시키는 AGC 앰프와,An AGC amplifier for amplifying the transmit / receive output signal synthesized in the duplexer filter; 상기 AGC 앰프에서 증폭된 신호를 받아 송신 출력신호와 수신 출력신호로 분리하는 또다른 듀플렉서 필터와,Another duplexer filter which receives the signal amplified by the AGC amplifier and separates the transmission output signal and the reception output signal; 상기 AGC 앰프에서 증폭된 수신신호중 일부를 전송받아 작동하는 AGC를 포함하는 것을 특징으로 하는 이동통신기기의 송신 출력 제어회로.And a AGC operable to receive and operate a portion of the received signal amplified by the AGC amplifier.
KR1019960080890A 1996-12-31 1996-12-31 Transmitting power control circuit of mobile communication unit KR100252784B1 (en)

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Application Number Priority Date Filing Date Title
KR1019960080890A KR100252784B1 (en) 1996-12-31 1996-12-31 Transmitting power control circuit of mobile communication unit

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Application Number Priority Date Filing Date Title
KR1019960080890A KR100252784B1 (en) 1996-12-31 1996-12-31 Transmitting power control circuit of mobile communication unit

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KR19980061519A KR19980061519A (en) 1998-10-07
KR100252784B1 true KR100252784B1 (en) 2000-04-15

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