KR20080026968A - Input circuit of ground wave tuner - Google Patents

Input circuit of ground wave tuner Download PDF

Info

Publication number
KR20080026968A
KR20080026968A KR1020060092262A KR20060092262A KR20080026968A KR 20080026968 A KR20080026968 A KR 20080026968A KR 1020060092262 A KR1020060092262 A KR 1020060092262A KR 20060092262 A KR20060092262 A KR 20060092262A KR 20080026968 A KR20080026968 A KR 20080026968A
Authority
KR
South Korea
Prior art keywords
signal
booster
channel signal
filter
broadcasting channel
Prior art date
Application number
KR1020060092262A
Other languages
Korean (ko)
Inventor
최석동
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020060092262A priority Critical patent/KR20080026968A/en
Priority to EP07808287A priority patent/EP2052537A4/en
Priority to PCT/KR2007/004497 priority patent/WO2008035893A1/en
Publication of KR20080026968A publication Critical patent/KR20080026968A/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
    • H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
    • H03F3/191—Tuned amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H5/00—One-port networks comprising only passive electrical elements as network components
    • H03H5/02—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements
    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • 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
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/114—Indexing scheme relating to amplifiers the amplifier comprising means for electro-magnetic interference [EMI] protection
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/165—A filter circuit coupled to the input of an amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/216—A coil being added in the input circuit, e.g. base, gate, of an amplifier stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/225—Indexing scheme relating to amplifiers the input circuit of an amplifying stage comprising an LC-network
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/237—A parallel resonance being added in series in the input circuit, e.g. base, gate, of an amplifier stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/391—Indexing scheme relating to amplifiers the output circuit of an amplifying stage comprising an LC-network
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/75—Indexing scheme relating to amplifiers the amplifier stage being a common source configuration MOSFET

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

A booster circuit for a terrestrial tuner is provided to attenuate or block the intensity of a signal previously through a rejection filter before the signal with a strong input intensity is amplified by a booster when the unnecessary strong intensity of signal is inputted except a broadcasting channel signal received through an antenna, thereby preventing interference between the unnecessary signal and the broadcasting channel signal and an oscillator killing phenomenon. A booster circuit for a terrestrial tuner comprises a loop-through(20), a citizen band filter(21), a rejection filter(22) and a booster(23). The loop-though outputs a broadcasting channel signal inputted from an antenna(ANT) to other devices. The citizen band filter removes a citizen band signal from a broadcasting channel signal inputted through an antenna. The rejection filter attenuates a frequency band in which there is no broadcasting signal in the broadcasting channel signal. The booster amplifies the broadcasting channel signal outputted from the rejection filter.

Description

지상파 튜너의 부스터회로{INPUT CIRCUIT OF GROUND WAVE TUNER}INPUT CIRCUIT OF GROUND WAVE TUNER}

도 1 은 종래 디지털 지상파 튜너의 부스터회로도1 is a booster circuit diagram of a conventional digital terrestrial tuner.

도 2 는 본 발명의 일 실시예에 따른 지상파 튜너의 부스터회로도2 is a booster circuit diagram of a terrestrial tuner according to an embodiment of the present invention.

도 3 은 본 발명의 일 실시예에 따른 지상파 튜너의 부스터회로의 특성도3 is a characteristic diagram of a booster circuit of a terrestrial tuner according to an embodiment of the present invention;

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

21; 시티즌 밴드필터 22; 리젝션필터21; Citizen band filter 22; Rejection filter

23; 부스터23; booster

본 발명은 지상파 튜너의 부스터회로에 관한 것이다.The present invention relates to a booster circuit of a terrestrial tuner.

일반적으로 지상파 방송은 유럽 방식인 OFDM과, 미국방식인 VSB로 전송하게 되는데, 특히 상기 직교주파수 분할다중(OFDM; Orthogonal Frequency Division Multiplexing)방식은 다중 반송파(multi-carrier) 변조방식의 일종으로서, 광대역 신호를 상호 직교성을 갖는 복수의 반송파를 사용하여 다수의 협대역 부 채널로 분산하여 전송하므로 주파수 대역을 효율적으로 사용할 수 있으며, 다중 경로에 의한 심각한 주파수 선택적 페이딩 채널에 의한 신호왜곡이 협대역의 각 부 채널에 주파 수 비선택적 페이딩 왜곡으로 나타나므로 채널 왜곡 보상이 용이하여 유무선 채널에서의 고속 데이터 전송에 적합하여 주로 유럽에서 사용되고 있다.In general, terrestrial broadcasting is transmitted through OFDM, which is European, and VSB, which is American. Since the signals are distributed and transmitted to a plurality of narrowband subchannels using a plurality of carriers having mutual orthogonality, the frequency band can be efficiently used. Since the channel appears as non-selective fading distortion in the subchannel, it is easy to compensate for channel distortion, and is used mainly in Europe for high-speed data transmission in wired and wireless channels.

상기 직교주파수 분할 다중 방식의 지상파 튜너로 방송을 수신하고 있는 상태에서 지에스엠(GSM: Global System for Mobile Communications(범유럽 디지털 셀룰러 통일 규격)폰을 상기 수신중인 OFDM 지상파 튜너에 근접해서 사용하게 되는 경우, 즉 도 1에 도시한 바와 같이, 안테나(ANT)와 시티즌 밴드 필터(11)를 통해서 입력되는 신호의 세기가 튜너의 발진기의 발진주파수보다 세기가 훨씬 클 경우, 상기 입력되는 신호에 의해서 발진이 영향을 받게 되어 상기 발진기가 발진이 되지 않은 발진기 킬링(OSC KILLING) 현상이 발생하게 된다.When a GSM system is being used to receive a broadcast using the orthogonal frequency division multiplexing terrestrial tuner, a GSM (GSM) phone is used in close proximity to the OFDM terrestrial tuner being received. That is, as shown in Figure 1, when the intensity of the signal input through the antenna ANT and the citizen band filter 11 is much greater than the oscillation frequency of the oscillator of the tuner, the oscillation is generated by the input signal The oscillator killing phenomenon, in which the oscillator is not oscillated, occurs.

즉 직교주파수 분할 다중방식의 지상파 방송수신 대역 50 ~ 858MHz에서 원하는 방송채널(474MHz)신호를 수신하고 있는 상태에서, 900MHz를 중심주파수로 하는 지에스엠 신호(948MHz)가 입력된다면, 두 신호의 주파수는 간섭현상을 일으키게 된다.In other words, when receiving a desired broadcasting channel (474MHz) signal in the terrestrial broadcasting reception band 50 to 858MHz of the orthogonal frequency division multiplexing system, the GS signal (948MHz) having a center frequency of 900MHz is inputted, It will cause interference.

더구나 지에스엠 신호(0 ~ +10dBm)는 방송채널 신호(-80dBm ~ -25dBm)에 비해 비교할 수 없는 세기의 큰 신호를 사용하게 되므로, 상기 지에스엠 신호처럼 세기가 큰 신호가 부스터(12)에 입력되면, 상기 부스터(12)에서는 상기 지에스엠 신호 자체가 만들어 내는 변조 신호뿐만 아니라, 방송신호와 혼신에 의한 또 다른 신호를 만들어 튜너로 입력하게 된다.In addition, the GS signal (0 to + 10dBm) uses a large signal of incomparable strength compared to the broadcast channel signal (-80dBm to -25dBm), so that a signal having a large intensity as the GS signal is transmitted to the booster 12. When input, the booster 12 not only modulates the signal generated by the GS signal itself, but also generates another signal by interference with a broadcast signal and inputs it to the tuner.

이에 따라 상기 부스터(12)는 강한 지에스엠 신호를 증폭함으로써, 더 강한 신호가 튜너의 발진기를 킬링하는 현상을 일으키게 되고 또한 상호 혼변조에 의한 수신 성능에 치명적인 영향을 주게 된다.Accordingly, the booster 12 amplifies a strong GS signal, causing a stronger signal to kill the oscillator of the tuner, and also have a fatal effect on reception performance due to cross-modulation.

본 발명은 직교주파수 분할 다중 방식의 지상파 튜너에서 입력되는 불필요한 신호의 세기를 약하게 하여 주파수 간섭을 최소화한다.The present invention minimizes the frequency interference by reducing the strength of the unnecessary signal input from the terrestrial tuner of the orthogonal frequency division multiplexing scheme.

또한 본 발명은 지상파 방송 수신시 불필요한 신호 입력을 차단하여 튜너의 발진기 킬링 현상을 방지한다.In addition, the present invention blocks the unnecessary signal input when terrestrial broadcasting to prevent the oscillator killing of the tuner.

본 발명 지상파 튜너의 부스터 회로는 안테나를 통해서 입력되는 방송 채널 신호에서 시티즌 밴드신호를 제거하는 시티즌 밴드필터; 상기 시티즌 밴드신호가 제거된 방송채널 신호에서 방송용 신호가 아닌 주파수 대역을 감쇄하는 리젝션 필터; 및 상기 리젝션 필터로부터 출력된 방송채널 신호를 증폭하는 부스터를 포함한다. The booster circuit of the terrestrial tuner of the present invention comprises: a citizen band filter for removing a citizen band signal from a broadcast channel signal input through an antenna; A rejection filter for attenuating a frequency band other than the broadcast signal from the broadcast channel signal from which the citizen band signal is removed; And a booster for amplifying the broadcast channel signal output from the rejection filter.

이하 첨부되는 도면에 의거 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 2 는 본 발명의 일 실시예에 따른 지상파 튜너의 부스터 회로도 이고, 도 3 은 본 발명의 일 실시예에 따른 지상파 튜너의 부스터 회로의 특성도 이다.2 is a booster circuit diagram of a terrestrial tuner according to an embodiment of the present invention, and FIG. 3 is a characteristic diagram of a booster circuit of a terrestrial tuner according to an embodiment of the present invention.

본 발명은 시티즌 밴드필터(21), 리젝션 필터(22), 부스터(23)로 구성된다.The present invention consists of a citizen band filter 21, a reject filter 22, and a booster 23.

상기 시티즌 밴드 필터(21)는 캐패시터(C3)와 코일(L2)로 구성되어, 안테나(ANT)로부터 입력되는 방송 채널신호에서 사용하지 않은 시티즌 밴드(26MHz 내지 30MHz)를 제거하게 된다.The citizen band filter 21 is composed of a capacitor C3 and a coil L2 to remove unused citizen bands (26 MHz to 30 MHz) from a broadcast channel signal input from the antenna ANT.

상기 리젝션 필터(22)는 코일(L3), 캐패시터(C4)로 구성되어 상기 시티즌 밴 드필터(21)에서 입력되는 시티즌 밴드필터(21)를 통해서 입력되는 방송 채널신호 이외에 신호의 세기가 큰 신호, 예를 들면 0 ~ +10dBm 크기로 900MHz를 중심주파수로 하는 지에스엠신호(948MHz)를 감쇄하게 되며, 상기 감쇄되는 주파수 대역을 상기 코일(L3)과 캐패시터(C4)의 용량 값을 조절하여 설정할 수 있게 된다.The reject filter 22 is composed of a coil L3 and a capacitor C4 and has a high signal strength in addition to the broadcast channel signal input through the citizen band filter 21 input from the citizen band filter 21. Attenuates a signal, for example, a GS signal (948 MHz) having a center frequency of 900 MHz with a size of 0 to +10 dBm, and adjusts capacitance values of the coil L3 and the capacitor C4 in the attenuated frequency band. It can be set.

상기 부스터(23)는 트랜지스터(Q1)와 수동소자들로 구성되어, 상기 리젝션 필터(22)로부터 불필요한 신호가 저지되어 입력되는 방송 채널신호를 양호한 수신상태로 동조되도록 증폭하여 출력하게 된다.The booster 23 is composed of a transistor Q1 and passive elements, and amplifies and outputs a broadcast channel signal to be tuned to a good reception state by preventing unnecessary signals from the rejection filter 22.

도면중 미설명 부호 20은 안테나로 입력되는 신호를 다른 장치로 접속하는 루프스루(LOOP THROUGH)이다.In the figure, reference numeral 20 denotes a loop through which connects a signal input to an antenna to another device.

상기와 같이 구성되는 본 발명은 안테나(ANT)를 통해서 방송 채널신호가 입력되게 되면, 상기 입력되는 방송채널 신호는 루프스루(20)를 통해서 다른 장치로 출력됨과 아울러, 시티즌 밴드필터(21)를 통해서 사용하지 않은 대역 26MHz 내지 30MHz 주파수가 제거되어 상기 리젝션 필터(22)를 통해서 부스터(23)에 입력되고, 상기 부스터(23)에서는 입력된 방송 채널신호에 대하여 양호한 수신 상태로 동조되도록 증폭하여 튜너로 출력하게 된다.According to the present invention configured as described above, when a broadcast channel signal is input through an antenna ANT, the input broadcast channel signal is output to another device through the loop through 20 and the citizen band filter 21 is used. The unused band 26MHz to 30MHz frequency is removed and input to the booster 23 through the rejection filter 22. The booster 23 amplifies the tuner to tune to the received broadcast channel signal in a good reception state. Output to the tuner.

이때 상기 안테나(ANT)를 통해서 신호의 세기가 큰 방송채널 신호 이외에 신호가 입력되게 되면, 예를 들면 0 ~ +10dBm 크기로 900MHz를 중심주파수로 하는 지에스엠신호(948MHz)는 상기 리젝션 필터(22)의 코일(L3), 캐패시터(C4)로 필터링하여 도 3에 도시한 바와 같이 신호의 세기를 10dB ~ 20dB 감쇄하도록 함으로써, 상기 방송채널 신호 이외의 큰 세기를 갖는 신호가 사전에 부스터(23)로 입력되지 않 도록 하여 상기 큰 세기 신호 입력으로 인한 방송 채널신호와의 혼신 및 튜너의 성능에 악 영향을 방지하게 된다.At this time, when a signal other than a broadcasting channel signal having a large signal strength is input through the antenna ANT, for example, a GS signal (948 MHz) having a center frequency of 900 MHz with a size of 0 to +10 dBm is the rejection filter ( By filtering by the coil L3 and the capacitor C4 of 22, the signal strength is attenuated by 10 dB to 20 dB as shown in FIG. 3, so that a signal having a large intensity other than the broadcast channel signal is previously boosted. ) To prevent the interference with the broadcast channel signal and the bad performance of the tuner due to the input of the large intensity signal.

이상에서 설명한 바와 같이 본 발명은 지상파 튜너에서 안테나를 통해서 방송채널 신호 이외의 불필요한 신호의 세기가 큰 신호가 입력시, 상기 입력되는 세기가 큰 신호를 부스터로 증폭되기 전에 미리 리젝션 필터를 통해서 신호의 세기를 감쇄하거나 저지함으로써, 불필요한 신호 증폭으로 인한 방송 채널신호와의 혼신 및 튜너의 발진기가 발진하지 못하게 되는 발진기 킬링 현상을 방지할 수 있게 되는 것이다. As described above, in the present invention, when a signal having a large intensity of an unnecessary signal other than a broadcast channel signal is input through an antenna in a terrestrial tuner, the signal having a large intensity is input through a rejection filter before being amplified by the booster. By attenuating or preventing the intensity of the oscillator, it is possible to prevent oscillator killing, which prevents the oscillator from oscillating and the oscillator of the tuner due to unnecessary signal amplification.

Claims (5)

안테나를 통해서 입력되는 방송 채널 신호에서 시티즌 밴드신호를 제거하는 시티즌 밴드필터; 상기 시티즌 밴드신호가 제거된 방송채널 신호에서 방송용 신호가 아닌 주파수 대역을 감쇄하는 리젝션 필터; 및 상기 리젝션 필터로부터 출력된 방송채널 신호를 증폭하는 부스터를 포함하는 리젝션 필터를 포함하는 지상파 튜너의 부스터회로. A citizen band filter for removing the citizen band signal from the broadcast channel signal input through the antenna; A rejection filter for attenuating a frequency band other than the broadcast signal from the broadcast channel signal from which the citizen band signal is removed; And a rejection filter including a booster for amplifying the broadcast channel signal output from the rejection filter. 제 1 항에 있어서, 상기 리젝션 필터는 상기 부스터의 전단에 구비한 것을 특징으로 하는 지상파 튜너의 부스터회로.The booster circuit of a terrestrial tuner according to claim 1, wherein the reject filter is provided at the front end of the booster. 제 1 항에 있어서, 상기 리젝션 필터는 코일과 캐패시터를 구성한 것을 특징으로 하는 지상파 튜너의 부스터회로.The booster circuit of a terrestrial tuner according to claim 1, wherein the reject filter comprises a coil and a capacitor. 제 3 항에 있어서, 상기 코일과 캐패시터는 병렬로 연결한 것을 특징으로 하는 지상파 튜너의 부스터회로The booster circuit of a terrestrial tuner according to claim 3, wherein the coil and the capacitor are connected in parallel. 제 1 항에 있어서, 상기 방송용 신호가 아닌 대역은 지에스엠 방식의 이동통신을 위한 주파수 대역인 것을 특징으로 하는 지상파 튜너의 부스터회로.2. The terrestrial tuner booster circuit according to claim 1, wherein the band other than the broadcast signal is a frequency band for mobile communication of a GSM system.
KR1020060092262A 2006-09-22 2006-09-22 Input circuit of ground wave tuner KR20080026968A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020060092262A KR20080026968A (en) 2006-09-22 2006-09-22 Input circuit of ground wave tuner
EP07808287A EP2052537A4 (en) 2006-09-22 2007-09-18 Booster circuit
PCT/KR2007/004497 WO2008035893A1 (en) 2006-09-22 2007-09-18 Booster circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020060092262A KR20080026968A (en) 2006-09-22 2006-09-22 Input circuit of ground wave tuner

Publications (1)

Publication Number Publication Date
KR20080026968A true KR20080026968A (en) 2008-03-26

Family

ID=39200689

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020060092262A KR20080026968A (en) 2006-09-22 2006-09-22 Input circuit of ground wave tuner

Country Status (3)

Country Link
EP (1) EP2052537A4 (en)
KR (1) KR20080026968A (en)
WO (1) WO2008035893A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0160687B1 (en) * 1994-04-29 1999-01-15 김광호 Image signal receiving apparatus equipped with low noise amplifier
JP3547292B2 (en) * 1997-06-17 2004-07-28 アルプス電気株式会社 Television signal receiving tuner
JP3358724B2 (en) * 1999-08-20 2002-12-24 シャープ株式会社 Electronic tuner
WO2002073794A2 (en) * 2001-03-09 2002-09-19 California Institute Of Technology Switchless multi-resonant, multi-band power amplifier
WO2003015301A1 (en) * 2001-08-10 2003-02-20 Hitachi Metals, Ltd. Bypass filter, multi-band antenna switch circuit, and layered module composite part and communication device using them
JP2005080109A (en) * 2003-09-02 2005-03-24 Murata Mfg Co Ltd High frequency switching circuit
KR100550875B1 (en) * 2004-02-27 2006-02-10 삼성전기주식회사 Rf modulator with narrow band pass filter
JP2005323063A (en) * 2004-05-07 2005-11-17 Hitachi Metals Ltd Branching filter circuit

Also Published As

Publication number Publication date
WO2008035893A1 (en) 2008-03-27
EP2052537A4 (en) 2011-03-16
EP2052537A1 (en) 2009-04-29

Similar Documents

Publication Publication Date Title
KR100653515B1 (en) Mobile station for mobile communication system
JP6500913B2 (en) High frequency circuit component and communication device
US20120243447A1 (en) Dual antenna distributed front-end radio
KR20130069443A (en) System and method for an rf receiver
US10476535B2 (en) High-frequency front end circuit and communication apparatus
US10291269B2 (en) Power amplification module
CN111431545B (en) Electronic equipment and communication interference control method
US10069523B2 (en) Power amplification module
KR102086939B1 (en) Variable Frequency Filter, RF Front End Circuit and Communication Terminal
KR100703366B1 (en) Apparatus for eliminating noise of wireless transceiver
CN108476035B (en) High-frequency front-end circuit and communication device
KR100896627B1 (en) Chip-tuner type tv receiver with loop though
KR100638879B1 (en) Complex module with the improved harmonics rejection
KR20080026968A (en) Input circuit of ground wave tuner
US8050633B2 (en) Wireless communication system
KR100884250B1 (en) Tower Mounted Amplifier with Simplified Structure and Mobile Base Station Including the Same
CN114520663A (en) Signal transmitting device, radio frequency front-end module and equipment
KR20180023792A (en) Transmitter with improved function of receive band rejection
KR101405890B1 (en) Antenna Apparatus and Frequency Division Duplexing Apparatus for Reducing and Cancelling Intermodulation Generated Passive Devices
KR100462278B1 (en) Apparatus of Receive in Mobile Communication Terminal
JP2012134637A (en) Tv tuner
JP2007142712A (en) High frequency apparatus
KR20060097237A (en) Power amplifier module oppressing harmonic element
JPH08125450A (en) Radio transmitter-receiver
KR100560000B1 (en) circuits of tuner for satellite broadcasting

Legal Events

Date Code Title Description
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid