JP6001290B2 - 発振回路 - Google Patents
発振回路 Download PDFInfo
- Publication number
- JP6001290B2 JP6001290B2 JP2012067333A JP2012067333A JP6001290B2 JP 6001290 B2 JP6001290 B2 JP 6001290B2 JP 2012067333 A JP2012067333 A JP 2012067333A JP 2012067333 A JP2012067333 A JP 2012067333A JP 6001290 B2 JP6001290 B2 JP 6001290B2
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- JP
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- Prior art keywords
- frequency
- circuit
- oscillation circuit
- mode
- resonance
- Prior art date
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- 230000010355 oscillation Effects 0.000 claims description 113
- 239000003990 capacitor Substances 0.000 claims description 53
- 239000013078 crystal Substances 0.000 claims description 52
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/362—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device the amplifier being a single transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
- H03B2200/0002—Types of oscillators
- H03B2200/0008—Colpitts oscillator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
- H03B2200/006—Functional aspects of oscillators
- H03B2200/007—Generation of oscillations based on harmonic frequencies, e.g. overtone oscillators
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Description
また、上記の発振回路は、エミッタとグランドとの間に第1インダクタを介して並列に設けられた抵抗及び第4キャパシタをさらに備え、第1キャパシタは、エミッタとグランドとの間に設けられており、第1インダクタは、エミッタと上記抵抗及び第4キャパシタとの間に設けられていてもよい。
[発振回路10の基本動作説明]
図1は、第1の実施形態の発振回路10の構成を示す。発振回路10は、水晶振動子20、トランジスタ30、第1共振回路40、第2共振回路50及び第3キャパシタ60を備える。水晶振動子20は、例えばSCカットの水晶振動子であり、Cモード周波数、及び、Cモード周波数に近接したBモード周波数において共振点を有する。また、水晶振動子20は、Cモード及びBモードの基本波周波数の他に、Cモード及びBモードのオーバートーン周波数においても共振点を有する。
図2は、第1の実施形態の発振回路10が有する負性抵抗の周波数特性の概念図を示す。同図における実線は発振回路10の負性抵抗を示し、破線は第1共振回路40及び第2共振回路50の代わりにキャパシタを有する従来のコルピッツ発振回路の負性抵抗を示す。
以上のとおり、第1の実施形態の発振回路10は、Cモードオーバートーン周波数において負の値を示す負性抵抗を有し、基本波周波数及びBモードオーバートーン周波数において正の値を示す負性抵抗を有するので、Cモードオーバートーン周波数において安定して発振することができるという効果を奏する。
図4は、第2の実施形態の発振回路10の構成を示す。図4に示す発振回路10は、第1キャパシタ44がトランジスタ30のエミッタと、抵抗46及び第4キャパシタ48の接続点との間に設けられている点で、図1に示した発振回路10と異なる。
Claims (5)
- 水晶振動子と、
前記水晶振動子がベースに接続されたトランジスタと、
前記トランジスタのエミッタとグランドとの間に設けられた並列共振回路である、第1インダクタ及び第1キャパシタを有する第1共振回路と、
前記エミッタと前記グランドとの間に設けられた、第2インダクタ及び第2キャパシタを有する第2共振回路と、
前記ベースと前記エミッタとの間に設けられた第3キャパシタと
を備え、
前記第1共振回路の第1共振周波数は、前記水晶振動子の主振動のオーバートーン周波数よりも高く、
前記第2共振回路の第2共振周波数は、前記水晶振動子の主振動のオーバートーン周波数よりも低く、
前記水晶振動子の主振動のオーバートーン周波数において負の値を示す負性抵抗を有し、かつ、前記水晶振動子の主振動及び副振動の基本波周波数、並びに、前記水晶振動子の副振動のオーバートーン周波数において正の値を示す負性抵抗を有する発振回路。 - 前記第1共振周波数は、前記水晶振動子の副振動のオーバートーン周波数よりも高い請求項1に記載の発振回路。
- 前記第2共振周波数は、前記水晶振動子の主振動の基本波周波数と等しい請求項1又は2に記載の発振回路。
- 前記エミッタと前記グランドとの間に並列に設けられた抵抗及び第4キャパシタをさらに備え、
前記第1キャパシタ及び前記第1インダクタは、前記エミッタとグランドとの間に並列に設けられており、
前記第1インダクタは、前記エミッタと前記抵抗及び前記第4キャパシタとの間に設けられている請求項1から3のいずれか一項に記載の発振回路。 - 前記エミッタと前記グランドとの間に前記第1インダクタを介して並列に設けられた抵抗及び第4キャパシタをさらに備え、
前記第1キャパシタは、前記エミッタとグランドとの間に設けられており、
前記第1インダクタは、前記エミッタと前記抵抗及び前記第4キャパシタとの間に設けられている請求項1から3のいずれか一項に記載の発振回路。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012067333A JP6001290B2 (ja) | 2012-03-23 | 2012-03-23 | 発振回路 |
US13/756,550 US9077281B2 (en) | 2012-03-23 | 2013-02-01 | Oscillator circuit |
Applications Claiming Priority (1)
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---|---|---|---|
JP2012067333A JP6001290B2 (ja) | 2012-03-23 | 2012-03-23 | 発振回路 |
Publications (2)
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JP2013201507A JP2013201507A (ja) | 2013-10-03 |
JP6001290B2 true JP6001290B2 (ja) | 2016-10-05 |
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JP2012067333A Active JP6001290B2 (ja) | 2012-03-23 | 2012-03-23 | 発振回路 |
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US (1) | US9077281B2 (ja) |
JP (1) | JP6001290B2 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6100641B2 (ja) * | 2013-07-29 | 2017-03-22 | 日本電波工業株式会社 | 差動発振器 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3832653A (en) * | 1973-08-20 | 1974-08-27 | Westinghouse Electric Corp | Low noise rf signal generator |
US4378532A (en) * | 1979-04-02 | 1983-03-29 | Hewlett Packard Company | Oscillator mode suppression apparatus having bandpass effect |
US4859969A (en) * | 1983-06-13 | 1989-08-22 | The United States Of America As Represented By The Secretary Of The Army | Single transistor dual mode crystal oscillator(U) |
JPH0563443A (ja) * | 1991-08-31 | 1993-03-12 | Nippon Dempa Kogyo Co Ltd | 水晶発振器 |
JP2001326532A (ja) * | 2000-05-16 | 2001-11-22 | Murata Mfg Co Ltd | 発振器 |
JP2004048652A (ja) * | 2002-11-29 | 2004-02-12 | Toyo Commun Equip Co Ltd | 高周波圧電発振器 |
JP2004266583A (ja) * | 2003-02-28 | 2004-09-24 | Toyo Commun Equip Co Ltd | 圧電発振器 |
JP2004289207A (ja) | 2003-03-19 | 2004-10-14 | Mitsubishi Electric Corp | 水晶発振器 |
JP2005072830A (ja) * | 2003-08-22 | 2005-03-17 | Toyo Commun Equip Co Ltd | 圧電発振器 |
US7262670B2 (en) * | 2003-12-09 | 2007-08-28 | Synergy Microwave Corporation | Low thermal drift, tunable frequency voltage controlled oscillator |
JP5089086B2 (ja) | 2005-06-07 | 2012-12-05 | 日本電波工業株式会社 | コルピッツ型発振器 |
JP4628878B2 (ja) | 2005-06-07 | 2011-02-09 | 日本電波工業株式会社 | 水晶発振回路 |
CA2566283C (en) * | 2005-11-02 | 2011-10-18 | Synergy Microwave Corporation | User-definable, low cost, low phase hit and spectrally pure tunable oscillator |
JP2010041346A (ja) | 2008-08-05 | 2010-02-18 | Nippon Dempa Kogyo Co Ltd | 副振動抑圧型の水晶発振回路 |
-
2012
- 2012-03-23 JP JP2012067333A patent/JP6001290B2/ja active Active
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2013
- 2013-02-01 US US13/756,550 patent/US9077281B2/en active Active
Also Published As
Publication number | Publication date |
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US20130249641A1 (en) | 2013-09-26 |
JP2013201507A (ja) | 2013-10-03 |
US9077281B2 (en) | 2015-07-07 |
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