JPS6184906A - Oscillating circuit - Google Patents
Oscillating circuitInfo
- Publication number
- JPS6184906A JPS6184906A JP20752584A JP20752584A JPS6184906A JP S6184906 A JPS6184906 A JP S6184906A JP 20752584 A JP20752584 A JP 20752584A JP 20752584 A JP20752584 A JP 20752584A JP S6184906 A JPS6184906 A JP S6184906A
- Authority
- JP
- Japan
- Prior art keywords
- section
- circuit
- oscillation frequency
- oscillation
- resonant circuit
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 63
- 230000005855 radiation Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業」−の利用分野〉
本発明は、発振回路に関し、さらに詳しくは、−オベレ
ーノぢナルアンプを用いて発振周波数の切換えが１１１
能なようにした発振回路に関する。[Detailed Description of the Invention] <Field of Application in Industry> The present invention relates to an oscillation circuit, and more particularly, the present invention relates to an oscillation circuit, and more particularly, to an oscillation circuit in which the oscillation frequency can be switched in 111 times using an obeletonal amplifier.
This invention relates to an oscillation circuit that enables
く従来の技術〉
第２図は従来例の発振回路の構成図である。第２図にお
いて、ｌは正転入力圧１ ａ、 ｌ ｂを２つ有４”ろ
オベレーノヨ→・ルアンプである。ｌｃ、Ｉｄはそれぞ
れこのオペレーショナルアンプ１の逆転入力部と出力部
である。このオペレーンヨナルアンプｌの各正転入力部
１ ａ、 Ｉ ｂと出力部１ｄとの間にそれぞれ１氏抗
１ｔ１．ｎ２とコンデンサＣ１，Ｃ２とて＋１■成され
ｌ−第１．第２共振回路部２ ａ、 ２ ｂが個別に接
続さＩＩ、ろ。第１共振回路部２ａと接地部３との間お
よび第２４１； 振回路部２ｂと接地部３との問にそれ
ぞれ第３．第４共振回路部２ｃ、２ｄが接続される。2. Prior Art FIG. 2 is a block diagram of a conventional oscillation circuit. In FIG. 2, l is a 4" rotary amplifier with two forward rotation input pressures 1a and lb. lc and Id are the reverse rotation input section and output section of this operational amplifier 1, respectively. Between each normal input section 1a, Ib and output section 1d of the operational amplifier 1, a 1 degree resistor 1t1.n2 and a capacitor C1, C2 are formed by +1. The circuit parts 2a and 2b are individually connected. Four resonant circuit sections 2c and 2d are connected.
このような構成の従来例の発振回路においては、＋ｉｉ
ｉ記第１．第３Ｊｌｉ振回路部２ ａ、 ２ ｃとによ
り第１発振周波敗ｒ１が決定され、第２．第４共振回路
部２ｂ、２ｄとにより第２発振周波敗ｒ２が決定される
ようになっており、これらの発振周波数の切換えは、発
振周波数切換信号によって行なわれるように構成されて
いる。In the conventional oscillation circuit with such a configuration, +ii
Book i, 1st. The first oscillation frequency r1 is determined by the third Jli oscillation circuit sections 2a and 2c, and the second oscillation frequency r1 is determined by the third Jli oscillation circuit section 2a, 2c. The second oscillation frequency r2 is determined by the fourth resonance circuit sections 2b and 2d, and switching of these oscillation frequencies is performed by an oscillation frequency switching signal.
このような発振回路において、例えば、今、第１、第３
ノ（振回路部２ ａ、 ２ ｃによって周波数ｒ１の発
振が行なわれているとすると、発振周波数の選択されな
い非選択側の第２．第４共振回路部２ｂ。In such an oscillation circuit, for example, now, first, third
(If the oscillation circuit units 2a and 2c are oscillating at a frequency r1, the second and fourth resonance circuit units 2b on the non-selected side where the oscillation frequency is not selected).
２ｄによる発振レベルはＯレベルでなければならない。The oscillation level due to 2d must be O level.
ところが、オペレーノヨナルアンブｌの出力部１ｄと第
１．第２共振回路部２ ａ、 ２ ｂとは共通に接続さ
れているために、非選択側である第２゜第４共振回路部
２ ｂ、 ２ ｄか選択側の影響を受け、二のため、オ
ペレーショナルアンプ１の出力レベルの（ｚ＋”Ｒ）／
（Ｚｔ＋ｚＩ／ｌＲ）倍の出力がこの非選択側に現われ
ることになる。However, the output part 1d of the operatonal arm 1 and the first . Since the second resonant circuit sections 2a and 2b are connected in common, the second and fourth resonant circuit sections 2b and 2d, which are the non-selected side, are influenced by the selected side, and , (z+”R)/of the output level of operational amplifier 1
(Zt+zI/lR) times the output will appear on this non-selected side.
ここで、１１は第４ノ１振回路部２ｄのインピーダンス
、ｌ、は第２１１ｊ娠回路詔２ｂのインピーダンス、Ｒ
はオペレーノーＩ−Ｉルアンプ１の人力インピーダンス
、Ｚ、／／ＲはＺｌとＲとの並列インピーダンスである
っこのような非選択側に現われる出力は、他の周辺機器
に対して輻射され、それに好ましくない影響を与えるの
で、二のような出力の発生はなくすよっに４゛ることか
望ましい。Here, 11 is the impedance of the fourth 1st swing circuit section 2d, l is the impedance of the 211jth swing circuit section 2b, and R
is the human power impedance of the operator I-I amplifier 1, and Z and //R are the parallel impedances of Zl and R.The output appearing on the non-selected side is radiated to other peripheral devices, and is preferable for that purpose. Therefore, it is desirable to set it to 4゜ to eliminate the occurrence of output like 2.
〈発明が解決しようとする問題点〉
本発明は、１述の点に鑑みて成されたしのであって、発
振層Ｉｌ数の選択されない非選択側の共振回路部からの
不・次な輻射を可及的に低減することを目的とずろ、。<Problems to be Solved by the Invention> The present invention has been made in view of the above-mentioned point, and is directed to solving the problem of non-order radiation from the resonant circuit section on the non-selected side where the number of oscillation layers Il is not selected. The aim is to reduce this as much as possible.
く問題点を解決セろための手段〉
本発明は、１．述の目的を達成するために、正転または
逆転の入力部を少なくと６２つ有するオペレーノジナル
アンプを備え、該オペレーショナルアンプの前記６入力
部と出力部との間に第１．第２ｊｔ−振回路ｉ！を個別
に接続し、前記第１共振回路部と接地部との間および第
２共振回路部と接地部との１ｍにそれぞれ第３．第４共
振口路部を接続し、前記第１．第３共振回路部とにより
第４発振周波敗を決定し、第２．第４共振回路部とによ
り第２発振周波数を決定し、発振周波数切換信号により
＠紀各発振周波敗の選択切換えが行なわれる発振回路に
おいて、前記発振周波数切換信号に同期して動作す゛る
スイッチ手段を設け、前記各入力部の内、前記スイッチ
手段により発振周波数が選択さイ１ない非選択側の第３
または第４兵振回路部に接続された入力部と接地部とを
電気的に短絡するようにしている。Means for Solving Problems> The present invention has the following features: 1. In order to achieve the above object, an operational amplifier having at least 62 forward or reverse input sections is provided, and a first . 2nd jt-oscillation circuit i! are individually connected, and a third. A fourth resonant port is connected to the first resonator. A fourth oscillation frequency is determined by a third resonant circuit section; In the oscillation circuit, the second oscillation frequency is determined by the fourth resonant circuit section, and the selection of each oscillation frequency is switched by the oscillation frequency switching signal. and a third one on the non-selected side where the oscillation frequency is selected by the switch means among the respective input parts.
Alternatively, the input section connected to the fourth auxiliary circuit section and the ground section are electrically short-circuited.
〈実施例〉
以下、図面によって本発明の実施例について詳細に説明
する。第１図は本発明の一実施例の発振回路の構成図で
あり、第２図に対応する部分には同一の参照符を付す。<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of an oscillation circuit according to an embodiment of the present invention, and parts corresponding to those in FIG. 2 are given the same reference numerals.
こめ実施例の発振回路は、正転入力部１ ａ、 Ｉ ｂ
を２つ有オろオペレーンヨナルアンプビを備える。この
オペレーショナルアンプビの各入力部ｌ ａ、 ｌ ｂ
と出力部１ ｄとの間には、第１．第２ＪＩＨ７ｌｊ回
路！’１ｓ２ａ、２ｂが個別的に接続され、第１ Ｊ％
振回路部２＋１と接地部３との間および第２共振回路部
２ｂと接地部“３との間には、それぞれ第３．第４共振
回路１１１２ｃ、２ｄが接続される。この第３．第４共
振回路部２ ｃ、 ２ ｄは、例えば、コイルとコンデ
ンサとより成る。オペレーノヨナルアノプビの逆転入力
ｒｌ＋ ｌ ｃと出力部１ｄとの間および逆転入力部Ｉ
ｃと接地部３との間には、抵抗Ｒ３，Ｒ４がそれぞれ接
続さイ１ろ、。The oscillation circuit of this embodiment has normal rotation input parts 1a and Ib.
Equipped with two operating lanes and an amplifier. Each input section of this operational amplifier l a, l b
and the output section 1d. 2nd JIH7lj circuit! '1s2a, 2b are connected individually, 1st J%
Third and fourth resonance circuits 1112c and 2d are connected between the resonance circuit section 2+1 and the ground section 3 and between the second resonance circuit section 2b and the ground section "3," respectively. 4 resonant circuit parts 2 c, 2 d are composed of, for example, a coil and a capacitor.
Resistors R3 and R4 are connected between C and the grounding section 3, respectively.
このような構成の発振回路では、第１．第３共振回路部
２ ａ’、 ２ ｃによって第１発振周波敗ｒ１が決定
され、第２．第４ｊｌ［回路部２ｂ、２ｄによって第２
発振周波改「２か決定される。これらの発振周波数ｒ１
．ｒ２の選択は、発振周波数切換信号によって行なわれ
る。In the oscillation circuit having such a configuration, the first. The first oscillation frequency r1 is determined by the third resonance circuit sections 2a' and 2c, and the second oscillation frequency r1 is determined by the third resonance circuit sections 2a' and 2c. 4th jl [second by circuit parts 2b and 2d
The oscillation frequency is determined to be 2. These oscillation frequencies r1
．． Selection of r2 is performed by an oscillation frequency switching signal.
この実施例の発振回路では、発振周波数が選択されない
非選択側の共振回路部の影響を可及的に低重４−るため
に、発振周波数切換１３号に同期して動ｒ１・１゛ろス
ｒ・、＝ｆ丁段としての第１．第２スイノチングトラノ
ノスタＴｒｌ 、Ｔｒ２をそれぞれ設けている。第１
第２スイソチングトラノノスタＴｒ１、Ｔｒ２の各コレ
クタは、正転入力部ｌ ａ、 ｌ ｂにそれぞれ接続さ
れ、各エミッタはそれぞれ接地さイ１ろ。第１．第２ス
イツチングトランノスタＴｒｌ 。In the oscillation circuit of this embodiment, in order to minimize the influence of the resonant circuit section on the non-selected side where the oscillation frequency is not selected, the oscillation frequency r1. The first . A second switching transistor Trl and Tr2 are provided, respectively. 1st
The collectors of the second switching transistors Tr1 and Tr2 are respectively connected to the normal rotation input parts la and lb, and the emitters are connected to the ground. 1st. Second switching transnosta Trl.
’ｌ” ｒ ２の各ベースには、発振周波数か選択され
なし・４１選択側のノ（振回路部に接続された入力部と
ス１′−ｒ−ｒ：／グトラ／ノスタの接１ｔ！！＋１＜
とを電気的に短イ；シ４ろための信号か発振周波数切換
信号に同期しで１）んられろ。'l' r Each base of 2 has an oscillation frequency or no selection/41 selection side no (input section connected to the oscillation circuit section and the connection 1'-r-r:/gutra/nostar connection 1t! !+1<
1) Synchronize with the oscillation frequency switching signal or the oscillation frequency switching signal.
例えば、第１．第３兵振回路１ＩＩＫ２ａ、２ｃによっ
て発振がイ１なｔ）れる場合には、第２スイツヂ／グト
ラノノスタ′ｒ「２のベースに発振周波数切換信号に同
期した信号か与えられ、これによって第２スイ！チノグ
トランノスクＴｒ２が導通し、非選択側の第２．第４共
振回路部２ｂ、２ｄに接続された入力部１ ｂと第２ス
イツチングトランノスタＴｒ２の接地部とが電気的に短
絡され、オペレーショナルアンプｌ°の入力インピーダ
ンスが小さくなる。For example, 1st. When oscillation is performed by the third oscillation circuit 1IIK2a, 2c, a signal synchronized with the oscillation frequency switching signal is applied to the base of the second switch/guitaronostar 2, and this causes the second switch to oscillate. !The switch transistor Tr2 becomes conductive, and the input section 1b connected to the second and fourth resonance circuit sections 2b and 2d on the non-selected side and the grounding section of the second switching transistor Tr2 are electrically short-circuited. As a result, the input impedance of the operational amplifier l° becomes smaller.
これによって、発振周波数の選択されない非選択側の第
２．第４ノ（振回路部２ ｂ、２ ｄが、選択側による
オペレーノヨナルアノプビの出力の影響を大幅に低減さ
Ｕろごとか＝１能となる。This allows the second oscillation frequency to be selected on the non-selected side. The fourth part (oscillator circuit parts 2b and 2d) greatly reduces the influence of the output of the operator on the selection side.
第２．第４共振回路部２ｂ、２ｄによって発振が行なわ
Ａｔ ”、＋ ｕ’Ｈ合には、同様に第１スイツチ／グ
トラノノスタ’ｌ’ ｒ ｌ ／Ｊ”１７通して非選択
側の第１．第３ Ｊｌｊｌ口振回路ａ、２ｃに接続され
て入力部１ａと第１スイーｌチノｑ’ ｌ、ラノノスタ
Ｔｒｌの接地部とが電気的に短絡されろ。なお、ギｉ記
第１．第２発振周波数ｒ１．ｒ２は」（に同し場合や、
互いに異なる場合を含むしのである。Second. When oscillation is performed by the fourth resonant circuit portions 2b and 2d and At'', + u'H, the first switch/gutranonostar 'l' r l /J'' 17 is similarly passed to the non-selected side. It is connected to the third Jljl mouth swing circuits a and 2c to electrically short-circuit the input part 1a and the ground part of the first switch q'l and Lannostar Trl. In addition, Book I, 1. Second oscillation frequency r1. r2 is the same as (or
This includes cases that are different from each other.
〈発明の効果〉
以１．のように本発明によれば、発振周波数切換信号に
同期して動作するスイッチ手段を設け、オベレーノ？１
→・ルアンブの各入力部の内、前記スイブヂト１々＋、
：、Ｌり発振周波数が選択されない非選択側の共振回路
部に接続された入力部と接地部とを電気的に１９絡・１
°ろようにしたので、発振周波数の選択されない４１選
択側の共振回路部からの不要な輻射を１１１及的に低減
することが可能となる。<Effects of the invention> Below 1. According to the present invention, a switch means that operates in synchronization with the oscillation frequency switching signal is provided, and Obeleno? 1
→・Among the input parts of Luanbu, one of the above Suibujito +,
:, electrically connect the input section connected to the resonant circuit section on the non-selected side where the L oscillation frequency is not selected and the ground section with 19 circuits.
Since the oscillation frequency is set to 111, unnecessary radiation from the resonant circuit section on the 41 selection side, where the oscillation frequency is not selected, can be reduced as much as possible.
第１図は本発明の一実施例の発振回路の構成図、第２図
は従来例の発振回路の構成図である。
１．１’−オペレーンｇナルアンプ、２ ａ、 ２ ｂ
、 ２ｃ、 ２ ｄ−共振回路部、３・・接地部、ｌ
ａ、 ｌ ｂ、 ｌ ｃ・入力部、１ｄ・出力部、Ｔｒ
ｌ、Ｔｒ２−第１．第２スイ！チノグトラノノスタ。FIG. 1 is a block diagram of an oscillation circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional oscillation circuit. 1.1'-operational g null amplifier, 2 a, 2 b
, 2c, 2d-resonant circuit section, 3... grounding section, l
a, l b, l c/input section, 1d/output section, Tr
l, Tr2-1st. Second sui! Chinogutranonosta.
Claims (2)
オペレーショナルアンプを備え、該オペレーショナルア
ンプの前記各入力部と出力部との間に第１、第２共振回
路部を個別に接続し、前記第１共振回路部と接地部との
間および第２共振回路部と接地部との間にそれぞれ第３
、第４共振回路部を接続し、前記第１、第３共振回路部
とにより第１発振周波数を決定し、第２、第４共振回路
部とにより第２発振周波数を決定し、発振周波数切換信
号により前記各発振周波数の選択切換えが行なわれる発
振回路において、 前記発振周波数切換信号に同期して動作するスイッチ手
段を設け、前記各入力部の内、前記スイッチ手段により
発振周波数か選択されない非選択側の第３または第４共
振回路部に接続された入力部と接地部とを電気的に短絡
することを特徴とする発振回路。(1) An operational amplifier having at least two forward or reverse input sections, a first and a second resonant circuit section being individually connected between each of the input sections and an output section of the operational amplifier; A third resonant circuit is connected between the first resonant circuit section and the grounding section and between the second resonant circuit section and the grounding section.
, a fourth resonant circuit section is connected, a first oscillation frequency is determined by the first and third resonant circuit sections, a second oscillation frequency is determined by the second and fourth resonant circuit sections, and the oscillation frequency is switched. In an oscillation circuit in which the selection of each oscillation frequency is switched by a signal, a switch means operating in synchronization with the oscillation frequency switching signal is provided, and among the input sections, a non-selected oscillation frequency is selected by the switch means. An oscillation circuit characterized in that an input section connected to a third or fourth resonant circuit section on the side and a ground section are electrically short-circuited.
いて、前記スイッチ手段がスイッチングトランジスタで
ある発振回路。(2) The oscillation circuit according to claim 1, wherein the switch means is a switching transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20752584A JPS6184906A (en) | 1984-10-03 | 1984-10-03 | Oscillating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20752584A JPS6184906A (en) | 1984-10-03 | 1984-10-03 | Oscillating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6184906A true JPS6184906A (en) | 1986-04-30 |
| JPH0564483B2 JPH0564483B2 (en) | 1993-09-14 |
Family
ID=16541157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20752584A Granted JPS6184906A (en) | 1984-10-03 | 1984-10-03 | Oscillating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6184906A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04160924A (en) * | 1990-10-25 | 1992-06-04 | Nec Ic Microcomput Syst Ltd | Semiconductor integrated circuit |
-
1984
- 1984-10-03 JP JP20752584A patent/JPS6184906A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04160924A (en) * | 1990-10-25 | 1992-06-04 | Nec Ic Microcomput Syst Ltd | Semiconductor integrated circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0564483B2 (en) | 1993-09-14 |
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