CN1084340A - 带有平衡输出和像频陷波器的双调谐电路 - Google Patents
带有平衡输出和像频陷波器的双调谐电路 Download PDFInfo
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- CN1084340A CN1084340A CN93116901A CN93116901A CN1084340A CN 1084340 A CN1084340 A CN 1084340A CN 93116901 A CN93116901 A CN 93116901A CN 93116901 A CN93116901 A CN 93116901A CN 1084340 A CN1084340 A CN 1084340A
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- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 6
- 230000002411 adverse Effects 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000035559 beat frequency Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/24—Continuous tuning of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning
- H03J3/26—Continuous tuning of more than one resonant circuit simultaneously, the circuits being tuned to substantially the same frequency, e.g. for single-knob tuning the circuits being coupled so as to form a bandpass filter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2210/00—Indexing scheme relating to details of tunable filters
- H03H2210/02—Variable filter component
- H03H2210/025—Capacitor
-
- 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
- H03H7/09—Filters comprising mutual inductance
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- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Superheterodyne Receivers (AREA)
- Amplifiers (AREA)
Abstract
提供了射频信号放大器从不平衡的信号结构到
平衡信号结构的转换,同时,在平衡电路的两侧包括
像频陷波器。把双调谐电路次级的接地端从地提高,
以提供平衡的电路结构。在平衡的电路结构中,连接
到平衡的次级引线之间适当信号结点上的一对小电
容用作陷波滤波器。
Description
本发明涉及电视接收机的射频(RF)调谐电路,更详细地说,涉及带有平衡输出的像频陷波器的双调谐电路。
有时希望,在平衡的电路结构下处理射频信号。特别是,调谐器的集成电路(IC,Sony公司的CXA1594L)是为了给UHF混频器一个平衡输入信号而设计的。这种集成电路的数据表表明从平衡-不平衡变压器得出平衡信号。平衡-不平衡变压器的缺点是,比射频变压器的体积大、也比较贵。
另外,经常希望在射频调谐电路中包括某些陷波器或滤波器,以防止由额外信号产生的对所需信号的处理有有害影响的非所需谐波、拍频和像频。某些这样的陷波器是针对可能会干扰6频道信号的7频道强信号,27MHz陷波器针对美国市民频段的强发射机,以及一种针对美国蜂窝电话传输所产生的890MHz像频信号的陷波器。在此认识到,当利用陷波器或其它滤波器来防止平衡电路中这种额外信号的有害影响时,必须在平衡结构的两侧都采用这样的陷波器。
简言之,本发明涉及把射频信号放大器从不平衡的信号结构转换成平衡信号结构的电路,而且,该电路在平衡电路的两侧都包括像频陷波器。把双调谐电路次级的接地端从地提高,以提供平衡的电路结构。在平衡的电路结构中,连接到平衡的次级引线之间适当信号结点上的一对小电容提供了陷波滤波器。
参看附图,其中,相同的元件以相同的标号标出,其中:
图1示出包括像频陷波器的射频部分中,先有技术射频放大器的原理图;
图2为图1中像频陷波器的幅频特性图;
图3示出根据本发明几个方面射频放大器的原理图。
下面参看图1,图1示出电视机、调频收录机等示范性调谐器的一部分。在示范性频率范围(例如,包括VHF和UHF频段)内,从天线(未示出)或其它信号源得出射频输入信号。来自信号源的信号耦合到射频放大器12上,在示范性实施例中,该射频放大器12为双栅场效应管(FET)放大器。放大器12的输出通过耦合电容13馈到具有初级线圈16和次级线圈20的双调谐变压器14上,初级线圈16与初级电容(例如,与微调电容19串联的变容二极管18)调谐,次级线圈20与次级电容(例如,与微调电容23串联的变容二极管22)调谐。通过相应的电阻21和25,把调谐电压TV加到变容二极管18和22上,这样,以先有技术中周知的方式改变变容二极管18和22的电容量,来实现调谐。变容二极管18和22响应于调谐电压TV而改变其电容量,这提供了从多频道射频输入信号中选择出一个所需频道的调谐选择。在初级线圈16与次级线圈20之间,提供相互的磁耦合。线圈16和20为相应的变容二极管18和22提供直流回路。
变压器14的这种结构一般称为把相应线圈16和20的引线16a和20a连接到电压基准(地)上的双调谐电路。把变压器14的不平衡输出通过阻抗匹配电路24馈出,为以后的信号处理(未示出,例如:声表面波滤波器、视频亮度、色度、同步处理以及声音处理)提供不平衡信号。在示范性实施例中,后级的一部分射频处理电路,即混频和中频(IF)放大,由集成电路CXA 13551来提供。
继续参看图1,电容CS从次级线圈20上的输出信号结点27连接到初级线圈16上的输入结点28。CS是零点几微微法(例如,在示范性实施例中,为0.15pf),也可由印刷电路板上铜导线所形成的电容来提供。电容CS与变压器14的互感一起工作,以便在输出端26上提供像频陷波的衰减,在示范性实例中,该像频为美国蜂窝电话的像频890MHz。这一频率特性示于图2。
图2示出双调谐电路14的幅频特性,该幅频特性具有中心调谐的通频带,该通频带的上边缘被修整,以便在该通频带中心的远侧要抑制的频率上给出衰减凹陷。
集成电路CXA1594L在UHF混频器的信号输入端上要求平衡的信号和平衡的阻抗。为了适应这些要求,图3示出根据本发明的几个方面,来改变图1的电路。图3中与图1中元件对应的相同元件以相同的标号标出。
为了提供平衡的输出,把图1的引线20a与基准电位(地)断开,通过耦合电容30b连接到端子26b上。输出引线26通过耦合电容30a仍然连接到端子26a上。这样,端子26a和26b上的输出电压对地就平衡了,而且,端子26a和26b对地有平衡的阻抗。因为变容二极管22的直流反回电路已从地提高,所以,提供了较大的直流反回电阻32。
为使电路平衡,把电容CS分成CS1和CS2。工作时,电容CS1和CS2是串联的。这样,为了保持同样的陷波频率,电容CS1和CS2的数值必须等于电CS原始值的两倍。实际上,电容CS、CS1和CS2的数值比变容二极管18和22的数值小很多。
Claims (3)
1、电视接收机中的一种调谐设备,包括:
用于放大射频信号的装置(12),该装置(12)具有连接到相对于基准电位为信号结点上的输出端;
包括第一变容二极管(18)和第一电感元件(14、16)的第一调谐电路(14、16、18),第一变容二极管(18)响应于调谐电压,第一电感元件(14、16)从信号结点连接到基准电位点上,用以根据调谐电压来选择所述已放大的射频信号之一;
包括第二变容二极管(22)和第二电感元件(14、20)的第二调谐电路(14、20、22),第二变容二极管(22)响应于调谐电压,第二电感元件(14、20)根据调谐电压来进一步选择所述已放大的射频信号所述之一;
所述第一和第二调谐电路(14、16、18、20、22)形成双调谐电路,所述第一和第二电感元件(16、20)为电感耦合;
第二电感元件(20)具有一对相对于基准电位为平衡的输出端;
第一陷波电容(Cs1),该电容连接到第二电感元件(20)的一个输出端与信号结点之间;
其特征在于还包括:
第二陷波电容(Cs2),该陷波电容连接在第二电感元件(20)的另一个输出端与基准电位之间;
第一和第二陷波电容(Cs1、Cs2),该电容在一对输出端(26a、26b)上的每一个上为已调谐的射频信号提供陷波频率。
2、根据权利要求1所述的调谐设备,其特征在于第一和第二陷波电容(CS1、CS2)都比第一和第二变容二极管(18、22)的电容量要小。
3、根据权利要求2所述的调谐设备,其特征在于第一和第二陷波电容(CS1、CS2)都由在印刷电路极上蚀刻的导线所形成。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/938,193 US5285179A (en) | 1992-08-28 | 1992-08-28 | Double tuned circuit with balanced output and image trap |
US938.193 | 1992-08-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1084340A true CN1084340A (zh) | 1994-03-23 |
CN1036970C CN1036970C (zh) | 1998-01-07 |
Family
ID=25471064
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN93116901A Expired - Fee Related CN1036970C (zh) | 1992-08-28 | 1993-08-27 | 带有平衡输出和像频陷波器的双调谐电路 |
Country Status (10)
Country | Link |
---|---|
US (1) | US5285179A (zh) |
EP (1) | EP0584732B1 (zh) |
JP (1) | JP3038460B2 (zh) |
KR (1) | KR100326802B1 (zh) |
CN (1) | CN1036970C (zh) |
DE (1) | DE69312602T2 (zh) |
ES (1) | ES2105018T3 (zh) |
MX (1) | MX9305193A (zh) |
MY (1) | MY111335A (zh) |
SG (1) | SG90694A1 (zh) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
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US5619283A (en) * | 1994-08-08 | 1997-04-08 | Thomson Consumer Electronics, Inc. | Double tuned RF circuit with balanced secondary |
US5499056A (en) * | 1994-08-08 | 1996-03-12 | Thomson Consumer Electronics, Inc. | Bandswitchable double tuned RF circuit with balanced secondary |
US5574413A (en) * | 1995-03-02 | 1996-11-12 | Motorola, Inc. | Tunable filter having a capacitive circuit connected to ground |
US5752179A (en) * | 1995-08-17 | 1998-05-12 | Zenith Electronics Corporation | Selective RF circuit with varactor tuned and switched bandpass filters |
US6035185A (en) * | 1995-08-17 | 2000-03-07 | Zenith Electronics Corporation | Selective RF circuit with varactor tuned bandpass switched bandpass filters |
US5715531A (en) * | 1995-11-20 | 1998-02-03 | Nextlevel Systems (Taiwan), Ltd. | Synchronous tracking filter circuit for a broadcast satellite tuner |
JPH11205700A (ja) * | 1998-01-12 | 1999-07-30 | Alps Electric Co Ltd | 複同調回路 |
AU1347101A (en) * | 1999-10-27 | 2001-05-08 | Pulse Engineering, Inc. | High frequency, large bandwidth balun and method of manufacturing |
JP2002280878A (ja) * | 2001-03-19 | 2002-09-27 | Alps Electric Co Ltd | 電子回路ユニット |
JP2002359788A (ja) * | 2001-05-31 | 2002-12-13 | Alps Electric Co Ltd | テレビジョン受信機 |
US7102464B1 (en) * | 2002-04-04 | 2006-09-05 | Triquint Semiconductor, Inc. | Switched transformer for adjusting power amplifier loading |
TW583846B (en) * | 2002-08-01 | 2004-04-11 | Realtek Semiconductor Corp | Superheterodyne transceiver |
JP3106132U (ja) | 2004-06-23 | 2004-12-16 | アルプス電気株式会社 | テレビジョンチューナ |
DE102005056486A1 (de) * | 2005-11-20 | 2007-05-31 | Atmel Germany Gmbh | Eingangsfilter zur Spiegelfrequenzunterdrückung |
US7773707B2 (en) * | 2006-07-31 | 2010-08-10 | Motorola, Inc. | Tunable narrow band filter |
FR2906946B1 (fr) * | 2006-10-06 | 2008-12-19 | Thales Sa | Filtre tractable rapide |
TWI345417B (en) * | 2007-09-07 | 2011-07-11 | Himax Tech Ltd | Tuner and transformer formed by printed circuit board thereof |
JP4473909B2 (ja) * | 2007-12-28 | 2010-06-02 | アルプス電気株式会社 | テレビジョンチューナの複同調回路 |
US8873252B2 (en) * | 2008-03-26 | 2014-10-28 | Enphase Energy, Inc. | Method and apparatus for extending zero-voltage switching range in a DC to DC converter |
TWI360252B (en) * | 2008-07-11 | 2012-03-11 | Advanced Semiconductor Eng | Transformer |
EP2549645A1 (en) | 2011-07-21 | 2013-01-23 | Telefonaktiebolaget LM Ericsson (publ) | Transformer filter arrangement |
JP6077882B2 (ja) * | 2013-02-26 | 2017-02-08 | グンゼ株式会社 | 二重靴下 |
DE102014219374A1 (de) * | 2014-09-25 | 2016-03-31 | Siemens Aktiengesellschaft | Vorrichtung mit einstellbarem Kapazitätswert zum Abstimmen eines schwingfähigen Systems, schwingfähiges System und Energieübertragungssystem |
US10333410B2 (en) * | 2016-09-15 | 2019-06-25 | Futurewei Technologies, Inc. | Common-mode (CM) electromagnetic interference (EMI) reduction in resonant converters |
US20220021365A1 (en) * | 2020-07-16 | 2022-01-20 | Qualcomm Incorporated | Matching network with tunable notch filter |
Family Cites Families (10)
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---|---|---|---|---|
US3903487A (en) * | 1974-05-01 | 1975-09-02 | Gte International Inc | Multi-circuit selection filter for two different frequency ranges |
US4048598A (en) * | 1976-05-28 | 1977-09-13 | Rca Corporation | Uhf tuning circuit utilizing a varactor diode |
US4361909A (en) * | 1980-05-30 | 1982-11-30 | Rca Corporation | Pre-tuner tracking traps responsive to a tuning voltage |
JPS58146107A (ja) * | 1982-02-25 | 1983-08-31 | Matsushita Electric Ind Co Ltd | Fm復調装置 |
JPS59152714A (ja) * | 1983-02-18 | 1984-08-31 | Fujitsu General Ltd | 可変複同調回路 |
US4601062A (en) * | 1985-02-28 | 1986-07-15 | Rca Corporation | Tracking image frequency trap |
US4662001A (en) * | 1985-08-15 | 1987-04-28 | Zenith Electronics Corporation | Tunable notch filter for image frequency and conducted local oscillator leakage rejection |
US4783849A (en) * | 1986-11-26 | 1988-11-08 | Rca Licensing Corporation | FET tuner |
US5034994A (en) * | 1989-04-13 | 1991-07-23 | Rca Licensing Corporation | Single balanced mixer with output filter |
US5020146A (en) * | 1989-04-17 | 1991-05-28 | Rca Licensing Corporation | Lossy constant bandwidth tuned circuit |
-
1992
- 1992-08-28 US US07/938,193 patent/US5285179A/en not_active Expired - Lifetime
-
1993
- 1993-07-13 MY MYPI93001364A patent/MY111335A/en unknown
- 1993-08-20 DE DE69312602T patent/DE69312602T2/de not_active Expired - Lifetime
- 1993-08-20 EP EP93113318A patent/EP0584732B1/en not_active Expired - Lifetime
- 1993-08-20 SG SG9602077A patent/SG90694A1/en unknown
- 1993-08-20 ES ES93113318T patent/ES2105018T3/es not_active Expired - Lifetime
- 1993-08-26 MX MX9305193A patent/MX9305193A/es unknown
- 1993-08-26 KR KR1019930016665A patent/KR100326802B1/ko not_active IP Right Cessation
- 1993-08-27 JP JP5247608A patent/JP3038460B2/ja not_active Expired - Fee Related
- 1993-08-27 CN CN93116901A patent/CN1036970C/zh not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
MY111335A (en) | 1999-11-30 |
JP3038460B2 (ja) | 2000-05-08 |
EP0584732B1 (en) | 1997-07-30 |
KR100326802B1 (ko) | 2002-06-20 |
KR940004950A (ko) | 1994-03-16 |
MX9305193A (es) | 1994-05-31 |
DE69312602D1 (de) | 1997-09-04 |
CN1036970C (zh) | 1998-01-07 |
DE69312602T2 (de) | 1997-12-04 |
EP0584732A1 (en) | 1994-03-02 |
SG90694A1 (en) | 2002-08-20 |
JPH077387A (ja) | 1995-01-10 |
ES2105018T3 (es) | 1997-10-16 |
US5285179A (en) | 1994-02-08 |
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