KR100693832B1 - VHF input filter circuit - Google Patents

VHF input filter circuit Download PDF

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KR100693832B1
KR100693832B1 KR1020010016766A KR20010016766A KR100693832B1 KR 100693832 B1 KR100693832 B1 KR 100693832B1 KR 1020010016766 A KR1020010016766 A KR 1020010016766A KR 20010016766 A KR20010016766 A KR 20010016766A KR 100693832 B1 KR100693832 B1 KR 100693832B1
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South Korea
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coil
series
vhf
high frequency
parallel
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Korean (ko)
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KR20020076700A (en
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최승호
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대우전자부품(주)
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1758—Series LC in shunt or branch path

Abstract

본 발명은 초단파(VHF) 입력필터회로에 관한 것으로, 기존 구성회로에 있어 실장되는 부품의 수를 줄이고 코일의 용량을 변화시켜 초단파(VHF) 입력필터의 특성을 개선되게 함으로써 임피던스 정합을 최적화시킴은 물론 공진첨예도 및 선택도를 높여 방해신호의 간섭을 정확도 있게 배제할 수 있도록 하고, 줄어든 부품만큼 인쇄회로기판의 설계를 여유롭게 하여 부품간의 간섭을 줄일 수 있게 하므로 생산성을 향상시킬 수 있게 한다.
The present invention relates to an ultra-high frequency (VHF) input filter circuit, and to optimize the impedance matching by reducing the number of components to be mounted in the existing configuration circuit and by changing the capacity of the coil to improve the characteristics of the ultra-high frequency (VHF) input filter. Of course, by increasing the resonance sharpness and selectivity, it is possible to accurately exclude the interference of the interference signal, and to reduce the interference between parts by allowing the design of the printed circuit board as much as the reduced parts to improve the productivity.

Description

초단파 입력필터회로{VHF input filter circuit} Microwave Input Filter Circuits {VHF input filter circuit}             

도 1은 종래기술에 따른 초단파(VHF) 입력필터회로를 나타내는 회로도이다.1 is a circuit diagram illustrating an ultra-high frequency (VHF) input filter circuit according to the prior art.

도 2는 본 발명에 따른 초단파(VHF) 입력필터회로를 나타내는 회로도이다.Figure 2 is a circuit diagram showing a very high frequency (VHF) input filter circuit according to the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

L11∼L17: 코일 C11∼C18: 콘덴서L11 to L17: Coil C11 to C18: Condenser

SD1,SD2: 스위칭다이오드 VD1,VD2: 가변용량다이오드SD1, SD2: Switching diode VD1, VD2: Variable capacitance diode

본 발명은 초단파(VHF) 입력필터회로에 관한 것으로, 더욱 상세하게는 최소한의 부품을 사용하여 초단파(VHF) 입력필터의 특성을 개선함으로써 임피던스 정합을 최적화하여 방해신호의 간섭을 정확도 있게 배제할 수 있게 하는 초단파(VHF) 입력필터회로에 관한 것이다.The present invention relates to an ultra-high frequency (VHF) input filter circuit, and more particularly, to minimize impedance interference by optimizing impedance matching by improving the characteristics of the ultra-high frequency (VHF) input filter using minimal components. And an ultra-high frequency (VHF) input filter circuit.

일반적으로 튜너의 입력회로는 안테나의 입력신호를 능률적으로 고주파증폭회로에 공급하기 위해서 안테나로부터의 급전선과 고주파증폭의 입력 임피던스를 정합시키는 정합회로와, 튜너로 입력되는 신호 중에서 필요로 하는 신호대역 이외의 신호를 제거하는 필터회로로 구성한다.In general, the tuner's input circuit is a matching circuit for matching the feed impedance from the antenna and the input impedance of the high frequency amplification circuit to supply the antenna input signal to the high frequency amplification circuit efficiently, and other than the signal band required among the signals input to the tuner. It consists of a filter circuit to remove the signal of.

도 1은 종래기술에 따른 초단파(VHF) 입력필터회로를 나타내는 회로도이다.1 is a circuit diagram illustrating an ultra-high frequency (VHF) input filter circuit according to the prior art.

도 1에 나타낸 바와 같이, 종래기술에 따른 초단파(VHF) 입력필터회로는 콘덴서(C1∼C4) 및 코일(L1∼L4)로 구성되어 입력단자를 통해서 안테나로부터 전송되는 신호의 임피던스를 정합하는 제1필터부(10)와, 상기 제1필터부(10)의 코일(L3) 후단에 접속되어 초단파(VHF) 저역 스위칭시 하이엔드(high-end) 채널의 이미지를 제거하기 위한 제2필터부(20)로 구성된다.As shown in FIG. 1, the VHF input filter circuit according to the related art is composed of condensers C1 to C4 and coils L1 to L4 to match an impedance of a signal transmitted from an antenna through an input terminal. A second filter part connected to the first filter part 10 and the rear end of the coil L3 of the first filter part 10 to remove an image of a high-end channel during VHF low pass switching. It consists of 20.

상기 제2필터부(20)는 직렬 연결된 코일(L5)과 콘덴서(C5) 사이에 스위칭을 위한 스위칭다이오드(SD1)를 연결하고, 코일(L6) 및 콘덴서(C6)를 병렬 연결하여 채널의 이미지를 제거하며, 임피던스전압을 높이기 위한 코일(L7) 후단에는 가변용 량다이오드(VD1,VD2)를 직렬 또는 병렬 접속하고 콘덴서(C9)를 접속되게 한다.The second filter unit 20 connects the switching diode SD1 for switching between the coil L5 and the capacitor C5 connected in series, and connects the coil L6 and the capacitor C6 in parallel to form an image of the channel. After the coil L7 for increasing the impedance voltage is removed, the variable capacitance diodes VD1 and VD2 are connected in series or in parallel, and the capacitor C9 is connected.

그런데, 상기와 같은 종래의 초단파(VHF) 입력필터회로는 초단파(VHF) 저역으로 스위칭시 하이엔드 채널의 이미지 제거를 강화하기 위한 트랩(C6,L6)이 초단파(VHF) 고역에서는 완전히 배제되지 못하고 감쇠요인으로 작용하여 초단파(VHF) 고역의 출력특성까지 영향을 미치는 문제점이 있었다.
However, in the conventional high frequency (VHF) input filter circuit as described above, the trap (C6, L6) for enhancing the image removal of the high-end channel when switching to the low frequency (VHF) low pass is not completely excluded from the high frequency (VHF) high pass. As a damping factor, there was a problem affecting the output characteristics of the high frequency (VHF) high range.

본 발명은 상기와 같은 문제점을 해결하기 위하여 제안된 것으로서, 그 목적으로 하는 바는 실장부품의 수를 줄이고 코일의 용량변화를 통한 초단파(VHF) 입력필터의 특성을 개선함으로써 임피던스 정합을 최적화하고 공진첨예도 및 선택도를 높여 방해신호의 간섭을 정확도 있게 배제할 수 있도록 하는데 있다.
The present invention has been proposed to solve the above problems, and its purpose is to optimize impedance matching and improve resonance by reducing the number of components and improving the characteristics of the VHF input filter through the change in capacitance of the coil. The sharpness and selectivity are increased to accurately exclude interference from disturbing signals.

상기와 같은 목적을 달성하기 위한 본 발명은 입력단자에 접속된 콘덴서 후단에 차례대로 콘덴서 및 코일을 직렬 연결하여 병렬 접속되게 하고, 코일 및 콘덴서를 병렬 연결하여 직렬 접속되게 하며, 코일을 직렬 연결하되 코일 및 콘덴서를 직렬 연결하여 병렬 접속되게 하는 제1필터부와; 상기 제1필터부의 코일 후단에 차례대로 코일, 스위칭다이오드 및 콘덴서를 직렬 연결하여 병렬 접속되게 하고, 콘덴서에 스위칭다이오드를 직렬 연결하되 코일을 병렬 연결하여 직렬 접속되게 하며, 콘덴서 및 코일을 직렬 접속하고 가변용량다이오드의 (-)극을 직렬 또는 병렬 접속하되 가변용량다이오드의 (+)극에 콘덴서를 직렬 접속되게 하는 제2필터부로 구성되는 것을 그 기술적 구성상의 기본 특징으로 한다.In order to achieve the above object, the present invention provides a parallel connection by connecting a condenser and a coil in series to the rear end of the capacitor connected to the input terminal, and in parallel by connecting the coil and the condenser in series, and connecting the coil in series. A first filter unit connecting the coils and the capacitors in series so as to be connected in parallel; The coil, the switching diode and the condenser are sequentially connected to the rear end of the coil of the first filter unit in series to be connected in parallel, and the switching diode is connected in series to the condenser, and the coil is connected in parallel to make the series connection. The basic feature of the technical configuration is that the second filter part is connected in series or in parallel with the negative pole of the variable capacitance diode, and the capacitor is connected in series with the positive pole of the variable capacitance diode.

위와 같이 구성된 본 발명의 바람직한 실시예를 도면을 참조하면서 상세히 설명하면 다음과 같다.Referring to the preferred embodiment of the present invention configured as described above in detail with reference to the drawings as follows.

도 2는 본 발명에 따른 초단파(VHF) 입력필터회로를 나타내는 회로도이다.Figure 2 is a circuit diagram showing a very high frequency (VHF) input filter circuit according to the present invention.

도 2에 나타낸 바와 같이, 본 발명에 따른 초단파(VHF) 입력필터회로는 입력단자를 통해서 안테나로부터 전송되는 신호의 임피던스를 정합하고 동조하는 제1필터부(110)와, 상기 제1필터부(110)의 후단에 접속되어 초단파(VHF) 저역 하이엔드 채널의 이미지 트랩을 필요없게 동조하는 제2필터부(120)로 구성된다.As shown in FIG. 2, the VHF input filter circuit according to the present invention includes a first filter unit 110 for matching and tuning impedance of a signal transmitted from an antenna through an input terminal, and the first filter unit ( And a second filter unit 120 connected to the rear end of the 110 to unnecessarily tune an image trap of a high frequency (VHF) low-end high-end channel.

상기 제1필터부(110)는 입력단자에 접속된 콘덴서(C11) 후단에 차례대로 콘덴서(C12) 및 코일(L11)을 직렬 연결하여 병렬 접속되게 하고, 코일(L12) 및 콘덴서(C13)를 병렬 연결하여 직렬 접속되게 하며, 코일(L13)을 직렬 연결하되 코일(L14) 및 콘덴서(C14)를 직렬 연결하여 병렬 접속되게 한다.The first filter unit 110 sequentially connects the capacitor C12 and the coil L11 in series to the rear end of the capacitor C11 connected to the input terminal, and connects the coil L12 and the capacitor C13 in parallel. The parallel connection is made in series, and the coil L13 is connected in series, but the coil L14 and the condenser C14 are connected in series to be connected in parallel.

상기 제2필터부(120)는 제1필터부(110)의 코일(L13) 후단에 차례대로 코일(L15), 스위칭다이오드(SD1) 및 콘덴서(C15)를 직렬 연결하여 병렬 접속되게 하고, 콘덴서(C16)에 스위칭다이오드(SD2)를 직렬 연결하되 코일(L16)을 병렬 연결하여 직렬 접속되게 하며, 콘덴서(C17) 및 코일(L17)을 직렬 접속하고 가변용량다이오드(VD1,VD2)를 직렬 또는 병렬 접속하되 가변용량다이오드(VD2)의 (+)극에 콘덴서(C18)를 직렬 접속되게 한다.The second filter unit 120 connects the coil L15, the switching diode SD1, and the condenser C15 in series to the rear end of the coil L13 of the first filter unit 110 in series so as to be connected in parallel. The switching diode SD2 is connected in series to the C16, but the coil L16 is connected in parallel so as to be connected in series, the capacitor C17 and the coil L17 are connected in series, and the variable capacitance diodes VD1 and VD2 are connected in series or The capacitor C18 is connected in series with the positive terminal of the variable capacitance diode VD2.

이러한 구성으로 이루어진 본 발명에 따른 초단파(VHF) 입력필터회로의 작용 을 설명하면 다음과 같다.Referring to the operation of the ultra-high frequency (VHF) input filter circuit according to the present invention having such a configuration as follows.

상기 제1필터부(10)의 코일(L12) 및 콘덴서(C13)는 병렬공진을 형성하고, 코일(L13)은 입력단자로부터 입력 동조필터까지의 임피던스전압을 높이는 역할을 하여 초단파(VHF) 고역으로 스위칭시에 UHF 회로로 영향을 미치는 것을 방지하며, 코일(L14)은 충분히 큰 공진첨예도와 용량을 갖게 되어 단독으로 동조를 수행하게 된다.The coil L12 and the condenser C13 of the first filter unit 10 form a parallel resonance, and the coil L13 serves to increase the impedance voltage from the input terminal to the input tuning filter, thereby increasing the high frequency (VHF) high frequency band. In order to prevent the influence of the UHF circuit at the time of switching, the coil L14 has a sufficiently large resonance sharpness and capacitance to perform tuning alone.

상기 제2필터부(120)의 코일(L15)은 코일(L16)의 용량이 커진 만큼 그 용량을 감소시키는 역할을 하고, 높은 공진첨예도를 갖는 코일(L16)은 초단파(VHF) 저역의 하이엔드 이미지 트랩이 필요하지 않도록 동조시키며, 코일(L17)은 임피던스 전압을 높인다.The coil L15 of the second filter unit 120 serves to reduce the capacity of the coil L16 as the capacity of the coil L16 increases, and the coil L16 having a high resonance sharpness has a high frequency of high frequency (VHF) low band. The end image trap is tuned so that it is not necessary, and the coil L17 raises the impedance voltage.

이때, 상기 코일(L16)은 초단파(VHF) 저역의 이미지 트랩을 필요없게 동조시키므로 코일(L17)을 스트림 라인(stream-line)으로 설계 가능하게 한다.
At this time, the coil (L16) does not need to tune the image trap of the low frequency (VHF) low frequency, thereby making it possible to design the coil (L17) as a stream line (stream-line).

이상에서 살펴본 바와 같이 본 발명에 따른 초단파(VHF) 입력필터회로에 의하면, 실장부품의 수를 줄이고 코일의 용량변화를 통한 초단파(VHF) 입력필터의 특성을 개선함으로써 임피던스 정합이 최적화됨은 물론 공진첨예도 및 선택도가 높아져 방해신호의 간섭을 정확도 있게 배제할 수 있고, 조정공정이 단순해지며, 줄어든 부품만큼 인쇄회로기판 설계가 여유로와 부품간의 간섭이 줄어 생산성이 향상되는 탁월한 효과가 있다.As described above, according to the VHF input filter circuit according to the present invention, impedance matching is optimized as well as resonance matching by reducing the number of components and improving the characteristics of the VHF input filter by changing the capacitance of the coil. The higher the degree and selectivity, the more effectively the interference of the disturbance signal can be accurately excluded, the adjustment process is simplified, and the printed circuit board design as much as the reduced parts, there is an excellent effect of improving the productivity by reducing the interference between parts.

Claims (1)

입력단자에 접속된 콘덴서(C11) 후단에 차례대로 콘덴서(C12) 및 코일(L11)을 직렬 연결하여 병렬 접속되게 하고, 코일(L12) 및 콘덴서(C13)를 병렬 연결하여 직렬 접속되게 하며, 코일(L13)을 직렬 연결하되 코일(L14) 및 콘덴서(C14)를 직렬 연결하여 병렬 접속되게 하는 제1필터부(110)와;The capacitor C12 and the coil L11 are connected in series and connected in parallel to the rear end of the capacitor C11 connected to the input terminal, and the coil L12 and the capacitor C13 are connected in parallel and connected in series. A first filter unit 110 connecting the L13 in series and connecting the coil L14 and the condenser C14 in series so as to be connected in parallel; 상기 제1필터부(110)의 코일(L13) 후단에 차례대로 코일(L15), 스위칭다이오드(SD1) 및 콘덴서(C15)를 직렬 연결하여 병렬 접속되게 하고, 콘덴서(C16)에 스위칭다이오드(SD2)를 직렬 연결하되 코일(L16)을 병렬 연결하여 직렬 접속되게 하며, 콘덴서(C17) 및 코일(L17)을 직렬 접속하고 가변용량다이오드(VD1,VD2)의 (-)극이 직렬 또는 병렬 접속하되 가변용량다이오드(VD2)의 (+)극에 콘덴서(C18)를 직렬 접속되게 하는 제2필터부(120)로 구성되는 것을 특징으로 하는 초단파 입력필터회로.The coil L15, the switching diode SD1, and the capacitor C15 are connected in series to the rear end of the coil L13 of the first filter unit 110 in parallel, and the switching diode SD2 is connected to the capacitor C16. ) In series, connect the coils L16 in parallel to connect them in series, connect the capacitors C17 and coil L17 in series, and connect the (-) poles of the variable capacitance diodes VD1 and VD2 in series or in parallel. And a second filter unit (120) for connecting a capacitor (C18) in series with the positive electrode of the variable capacitance diode (VD2).
KR1020010016766A 2001-03-30 2001-03-30 VHF input filter circuit KR100693832B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048598A (en) * 1976-05-28 1977-09-13 Rca Corporation Uhf tuning circuit utilizing a varactor diode
JPH0746064A (en) * 1993-07-29 1995-02-14 Nec Corp Load matching circuit variable high-efficiency microwave amplifier
JPH0846473A (en) * 1994-07-27 1996-02-16 Mitsubishi Electric Corp Microwave variable attenuator
KR19990001806A (en) * 1997-06-17 1999-01-15 이형도 UICHF input circuit using high pass filter
KR100225472B1 (en) * 1995-11-09 1999-10-15 송보영 Small variable attenuator for vhf and uhf

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048598A (en) * 1976-05-28 1977-09-13 Rca Corporation Uhf tuning circuit utilizing a varactor diode
JPH0746064A (en) * 1993-07-29 1995-02-14 Nec Corp Load matching circuit variable high-efficiency microwave amplifier
JPH0846473A (en) * 1994-07-27 1996-02-16 Mitsubishi Electric Corp Microwave variable attenuator
KR100225472B1 (en) * 1995-11-09 1999-10-15 송보영 Small variable attenuator for vhf and uhf
KR19990001806A (en) * 1997-06-17 1999-01-15 이형도 UICHF input circuit using high pass filter

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