KR100693834B1 - UHF input filter circuit - Google Patents

UHF input filter circuit Download PDF

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KR100693834B1
KR100693834B1 KR1020010016767A KR20010016767A KR100693834B1 KR 100693834 B1 KR100693834 B1 KR 100693834B1 KR 1020010016767 A KR1020010016767 A KR 1020010016767A KR 20010016767 A KR20010016767 A KR 20010016767A KR 100693834 B1 KR100693834 B1 KR 100693834B1
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circuit
variable capacitance
parallel
capacitance diode
pass filter
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KR20020076701A (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

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  • Power Engineering (AREA)
  • Filters And Equalizers (AREA)

Abstract

본 발명은 극초단파 입력필터회로에 관한 것으로, 직렬공진회로(11) 및 병렬공진회로(12)를구비한 고역통과필터(10)와, 코일(L5) 및 가변용량다이오드(VCD)로 이루어진 동조회로(21)를 구비한 대역통과필터(20)를 이용한 극초단파(UHF) 입력필터회로에 있어서, 상기 대역통과필터(20)의 동조회로(21)는 가변용량다이오드(VCD)에 0.05∼0.1pF의 용량을 갖는 부유용량 패턴(21a)을 형성하여 병렬 연결되도록 하는 것을 특징으로 한다.The present invention relates to a microwave input filter circuit, comprising a high pass filter (10) having a series resonant circuit (11) and a parallel resonant circuit (12), and a coarse lookup consisting of a coil (L5) and a variable capacitance diode (VCD). In the ultra-high frequency (UHF) input filter circuit using the band pass filter 20 having the furnace 21, the tuning circuit 21 of the band pass filter 20 is 0.05 to 0.1 in the variable capacitance diode (VCD). The floating capacitance pattern 21a having a capacitance of pF is formed to be connected in parallel.

상기와 같은 본 발명에 의하면, 별도의 전자부품을 장착하지 않고 패턴에 의한 부유용량을 가변용량다이오드에 병렬 연결되게 하여 가변용량다이오드의 용량 변화범위를 최소화시킴으로써 비용이 절감되고, 주파수 대역 내에서 회로의 입력특성을 결정할 수 있게 되어 주파수에 따른 출력특성의 편차가 최소화되는 탁월한 효과가 있다.
According to the present invention as described above, it is possible to reduce the cost by minimizing the capacity change range of the variable capacitance diode by connecting the floating capacitance by the pattern in parallel to the variable capacitance diode without mounting a separate electronic component, the circuit within the frequency band It is possible to determine the input characteristics of the has an excellent effect of minimizing the deviation of the output characteristics according to the frequency.

Description

극초단파 입력필터회로{UHF input filter circuit} Microwave input filter circuit {UHF input filter circuit}             

도 1은 본 발명에 따른 극초단파(UHF) 입력필터회로를 나타내는 회로도이다.1 is a circuit diagram showing an ultra-high frequency (UHF) input filter circuit according to the present invention.

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

10: 고역통과필터 11: 직렬공진회로10: high pass filter 11: series resonant circuit

12: 병렬공진회로 20: 대역통과필터12: parallel resonant circuit 20: band pass filter

21: 동조회로 21a: 부유용량 패턴21: tuning circuit 21a: stray capacitance pattern

C1∼C6: 콘덴서 L1∼L6: 코일C1 to C6: condenser L1 to L6: coil

VCD: 가변용량다이오드VCD: Variable Capacitance Diode

본 발명은 극초단파(UHF) 입력필터회로에 관한 것으로, 더욱 상세하게는 패턴에 의한 부유용량을 가변용량다이오드에 병렬 연결되게 하여 가변용량다이오드의 동작범위에서 여유용량범위를 최소화하여 원하는 주파수대역 내에서 회로의 입력특성을 결정할 수 있도록 한 극초단파(UHF) 입력필터회로에 관한 것이다.The present invention relates to an ultra-high frequency (UHF) input filter circuit, and more particularly, the floating capacitance by the pattern is connected in parallel to the variable capacitance diode to minimize the extra capacity range in the operating range of the variable capacitance diode within a desired frequency band. The present invention relates to an ultra high frequency (UHF) input filter circuit capable of determining input characteristics of a circuit.

일반적으로 튜너의 극초단파(UHF) 입력필터회로에 사용되는 가변용량다이오드(VCD)는 극초단파(UHF) 입력범위에 대비하여 그 용량의 변화범위가 넓어 극초단파(UHF)의 하이엔드(high-end)대역에서는 필터특성이 나빠진다.In general, the variable capacitance diode (VCD) used in the tuner's ultra high frequency (UHF) input filter circuit has a wide range of change in capacitance compared to the ultra high frequency (UHF) input range, and thus the high-end band of the ultra high frequency (UHF). The filter characteristics deteriorate at.

이러한 극초단파(UHF) 하이엔드대역의 필터특성을 개선하기 위해서 가변용량다이오드에 병렬 커패시턴스를 추가하여 사용하게 되는데, 보통 0.2∼0.3pF의 용량을 갖는 적층 세라믹커패시터(MLCC)를 사용하고 있다.In order to improve the filter characteristics of the ultra-high frequency (UHF) high-end band, parallel capacitance is added to the variable capacitance diode, and a multilayer ceramic capacitor (MLCC) having a capacity of 0.2 to 0.3 pF is usually used.

그런데, 상기 적층 세라믹커패시터는 특수 규격으로 상대적으로 고가이며, 가변용량다이오드의 용량변화에 많은 영향을 끼치게 되므로 오히려 회로특성의 저하를 가져오는 단점이 있었고, 특정 주파수대역의 미스매칭(mismatching)을 감수하고 회로를 설계하므로 대역내 출력특성이 균일하지 못한 문제점이 있었다.
However, the multilayer ceramic capacitor is relatively expensive as a special standard, and has a disadvantage in that the circuit characteristics are deteriorated since it has a large influence on the capacity change of the variable capacitance diode, and takes mismatching of a specific frequency band. The circuit design has a problem that the in-band output characteristics are not uniform.

본 발명은 상기와 같은 문제점을 해결하기 위하여 제안된 것으로서, 그 목적 으로 하는 바는 별도의 전자부품을 장착하지 않고 패턴에 의한 부유용량을 가변용량다이오드에 병렬 연결되게 하여 가변용량다이오드의 용량 변화범위를 최소화시킴으로써 비용을 절감하고, 주파수 대역 내에서 회로의 입력특성을 결정할 수 있게 하여 주파수에 따른 출력특성의 편차를 최소화시킬 수 있는 최적의 극초단파(UHF) 입력필터를 설계할 수 있도록 하는데 있다.
The present invention has been proposed to solve the above problems, and its purpose is to allow the floating capacity by a pattern to be connected in parallel to the variable capacity diode without mounting a separate electronic component, thereby changing the capacity of the variable capacity diode. In order to reduce the cost and to determine the input characteristics of the circuit in the frequency band, it is possible to design an optimal ultra-high frequency (UHF) input filter that can minimize the variation of the output characteristics according to the frequency.

상기와 같은 목적을 달성하기 위한 본 발명은 직렬공진회로 및 병렬공진회로를 구비한 고역통과필터와, 코일 및 가변용량다이오드로 이루어진 동조회로를 구비한 대역통과필터를 이용한 극초단파(UHF) 입력필터회로에 있어서, 상기 대역통과필터의 동조회로는 가변용량다이오드에 부유용량 패턴을 형성하여 병렬 연결되도록 하는 것을 그 기술적 구성상의 기본 특징으로 한다.The present invention for achieving the above object is an ultra-high frequency (UHF) input filter circuit using a high pass filter having a series resonant circuit and a parallel resonant circuit, and a band pass filter having a tuning circuit consisting of a coil and a variable capacitance diode. In the present invention, the tuning circuit of the band pass filter has a basic feature in that it has a floating capacitance pattern formed in a variable capacitance diode so as to be connected in parallel.

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 1은 본 발명에 따른 극초단파(UHF) 입력필터회로를 나타내는 회로도이다.1 is a circuit diagram showing an ultra-high frequency (UHF) input filter circuit according to the present invention.

도 1에 나타낸 바와 같이, 본 발명에 따른 극초단파(UHF) 입력필터회로는 직렬공진회로(11) 및 병렬공진회로(12)를 구비한 고역통과필터(10)와, 코일(L5) 및 가변용량다이오드(VCD)로 이루어진 동조회로(21)를 구비한 대역통과필터(20)로 이루어진다.As shown in FIG. 1, an ultra high frequency (UHF) input filter circuit according to the present invention includes a high pass filter 10 having a series resonant circuit 11 and a parallel resonant circuit 12, a coil L5, and a variable capacitance. It consists of a band pass filter 20 having a tuning circuit 21 made of a diode VCD.

이때, 상기 대역통과필터(20)의 동조회로(21)는 가변용량다이오드(VCD)에 부 유용량 패턴(21a)을 형성하여 병렬 연결되게 한다.At this time, the tuning circuit 21 of the bandpass filter 20 forms an ineffective amount pattern 21a in the variable capacitance diode VCD to be connected in parallel.

또한, 상기 부유용량 패턴(21a)은 0.05∼0.1pF의 용량범위를 갖도록 형성하는 것이 바람직하다.In addition, the stray capacitance pattern 21a is preferably formed to have a capacitance range of 0.05 to 0.1 pF.

따라서, 상기와 같은 본 발명에 의하면 동조회로를 이루는 가변용량다이오드(VCD)의 고용량범위에 부유용량 패턴이 더해지게 되므로 다음의 주파수 식(1)에 따른 주파수와 커패시턴스의 상관관계에 의해 전체적으로 주파수범위의 폭이 감소하게 되며,Therefore, according to the present invention as described above, since the stray capacitance pattern is added to the high capacitance range of the variable capacitance diode (VCD) constituting the tuning circuit, the frequency range as a whole by the correlation between the frequency and the capacitance according to the following frequency equation (1). Will decrease the width of

Figure 112001007201522-pat00001
------------------------------(1)
Figure 112001007201522-pat00001
------------------------------(One)

상기 전체적인 주파수범위의 감소로 낮은 주파수의 동조에는 영향을 주지 않고 높은 주파수의 동조에만 큰 영향을 주어 별도의 조정없이 대역성능을 유지되게 하므로 수율이 증가된다.
The decrease in the overall frequency range does not affect the tuning of the low frequency, but has a large influence only on the tuning of the high frequency, so that the band performance is maintained without any adjustment, so that the yield is increased.

이상에서 살펴본 바와 같이 본 발명에 따른 극초단파(UHF) 입력필터회로에 의하면, 별도의 전자부품을 장착하지 않고 패턴에 의한 부유용량을 가변용량다이오드에 병렬 연결되게 하여 가변용량다이오드의 용량 변화범위를 최소화시킴으로써 비용이 절감되고, 주파수 대역 내에서 회로의 입력특성을 결정할 수 있게 되어 주파수에 따른 출력특성의 편차가 최소화되며, 제품의 성능이 일정하게 유지됨은 물론 별도의 조정이 없어도 대역성능이 유지되어 수율이 증가되는 탁월한 효과가 있 다.As described above, according to the ultra-high frequency (UHF) input filter circuit according to the present invention, the floating capacitance by the pattern is connected in parallel to the variable capacitance diode without installing a separate electronic component, thereby minimizing the variation range of the capacity of the variable capacitance diode. By reducing the cost, it is possible to determine the input characteristics of the circuit within the frequency band to minimize the deviation of the output characteristics according to the frequency, the product performance is kept constant and the band performance is maintained without any adjustment, yield This has an excellent effect of increasing.

Claims (2)

직렬공진회로(11) 및 병렬공진회로(12)를 구비한 고역통과필터(10)와, 코일(L5) 및 가변용량다이오드(VCD)로 이루어진 동조회로(21)를 구비한 대역통과필터(20)를 이용한 극초단파(UHF) 입력필터회로에 있어서,A bandpass filter having a high pass filter 10 having a series resonant circuit 11 and a parallel resonant circuit 12, and a tuning circuit 21 composed of a coil L5 and a variable capacitance diode VCD. In the ultra-high frequency (UHF) input filter circuit using 상기 대역통과필터(20)의 동조회로(21)는 가변용량다이오드(VCD)에 부유용량 패턴(21a)을 형성하여 병렬 연결되도록 하는 것을 특징으로 하는 극초단파 입력필터회로.The tuning circuit 21 of the band pass filter 20 forms a floating capacitance pattern 21a in a variable capacitance diode (VCD) so as to be connected in parallel. 제1항에 있어서,The method of claim 1, 상기 부유용량 패턴(21a)은 0.05∼0.1pF의 용량범위를 갖도록 형성하는 것을 특징으로 하는 극초단파 입력필터회로.The stray capacitance pattern (21a) is formed to have a capacitance range of 0.05 ~ 0.1pF microwave input filter circuit.
KR1020010016767A 2001-03-30 2001-03-30 UHF input filter circuit KR100693834B1 (en)

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JP3783142B2 (en) * 2003-08-08 2006-06-07 ティー・ティー・ティー株式会社 Communication system, communication device, communication method, and communication program for realizing the same

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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