JPH07118611B2 - Oscillator circuit - Google Patents
Oscillator circuitInfo
- Publication number
- JPH07118611B2 JPH07118611B2 JP27693889A JP27693889A JPH07118611B2 JP H07118611 B2 JPH07118611 B2 JP H07118611B2 JP 27693889 A JP27693889 A JP 27693889A JP 27693889 A JP27693889 A JP 27693889A JP H07118611 B2 JPH07118611 B2 JP H07118611B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- amplifier circuit
- input
- inverting amplifier
- 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.)
- Expired - Lifetime
Links
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は発振回路に関し、特にLSIの内部回路を動作さ
せることを目的とする発振回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator circuit, and more particularly to an oscillator circuit for operating an internal circuit of an LSI.
従来、発振回路は、反転増幅回路５と負帰還回路と出力
増幅回路10により構成され、特にコルピッツ形LC発振回
路は、第２図に示す回路で構成されていた。Conventionally, an oscillator circuit is composed of an inverting amplifier circuit 5, a negative feedback circuit and an output amplifier circuit 10. In particular, a Colpitts LC oscillator circuit is composed of the circuit shown in FIG.
負帰還回路として、反転増幅回路５の入力と出力との間
に、コンデンサ2,3とコイル４とからなるπ型LC共振回
路を接続し、出力信号を出力増幅回路10に入力し、この
出力を出力端子７に接続する構成となっていた。As a negative feedback circuit, a π-type LC resonance circuit consisting of capacitors 2 and 3 and a coil 4 is connected between the input and output of the inverting amplifier circuit 5, and the output signal is input to the output amplifier circuit 10, and this output Was connected to the output terminal 7.
この従来の回路は、反転増幅回路５の入力信号８と、前
記反転増幅回路５の出力信号９との間に、コイル４を並
列に接続し、前記コイル４と入力信号８の線との接続点
とコンデンサ２の一方とを接続し、前記コンデンサ２の
他方と第１電源（以下VDDとする）又は第２電源（以下V
SSとする）１とを接続し、コイル４と出力信号９の線と
の接続点とコンデンサ３の一方とを接続し、前記コンデ
ンサ３の他方とVDD又はVSS1とを接続し、反転増幅回路
５の出力信号９と出力増幅回路10の入力とを接続し、前
記出力増幅回路10の出力と出力端子７とを接続してあ
る。π型LC共振回路と反転増幅回路５とからなる発振段
の出力振幅が、次段のインバータ回路のスレッショルド
電圧を越えると出力が反転する。In this conventional circuit, a coil 4 is connected in parallel between an input signal 8 of the inverting amplifier circuit 5 and an output signal 9 of the inverting amplifier circuit 5, and the coil 4 and the line of the input signal 8 are connected. The point is connected to one side of the capacitor 2, and the other side of the capacitor 2 is connected to the first power source (hereinafter referred to as V DD ) or the second power source (hereinafter referred to as V DD ).
SS ) 1 is connected, the connection point between the coil 4 and the line of the output signal 9 is connected to one side of the capacitor 3, and the other side of the capacitor 3 is connected to V DD or V SS 1 and inverted. The output signal 9 of the amplifier circuit 5 is connected to the input of the output amplifier circuit 10, and the output of the output amplifier circuit 10 is connected to the output terminal 7. When the output amplitude of the oscillation stage composed of the π-type LC resonance circuit and the inverting amplifier circuit 5 exceeds the threshold voltage of the inverter circuit of the next stage, the output is inverted.
前述した従来の発振回路では、発振段の反転増幅回路５
の出力が次段の出力増幅回路10に入力する構成となって
いる為、発振起動時において、次段にバータ回路のスレ
ッシュホールド電圧を越えるまでの発振成長期に安定な
出力が得られないという欠点があった。In the conventional oscillation circuit described above, the inverting amplifier circuit 5 of the oscillation stage is used.
Since the output of is input to the output amplifier circuit 10 of the next stage, it is said that a stable output cannot be obtained during the oscillation growth period until the threshold voltage of the verter circuit is exceeded in the next stage at the time of starting the oscillation. There was a flaw.
本発明の目的は、前記欠点が解決され、発振起動時にお
いても、すみやかに安定な出力が得られるようにした発
振回路を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and to provide an oscillator circuit capable of promptly obtaining a stable output even at the time of starting oscillation.
本発明の発振回路の構成は、反転増幅回路の入力と出力
との間にπ型LC共振回路が接続され、この反転増幅回路
の入力と出力はそれぞれ差動増幅回路の第1,第２の入力
に接続され、この差動増幅回路の出力を出力端子となし
たことを特徴とする。According to the configuration of the oscillator circuit of the present invention, a π-type LC resonance circuit is connected between the input and the output of the inverting amplifier circuit, and the input and the output of the inverting amplifier circuit are respectively the first and the second of the differential amplifier circuit. It is characterized in that it is connected to an input and the output of this differential amplifier circuit is used as an output terminal.
本発明について図面を参照して説明する。 The present invention will be described with reference to the drawings.
第１図は本発明の一実施例の発振回路の回路図である。FIG. 1 is a circuit diagram of an oscillator circuit according to an embodiment of the present invention.
第１図において、本実施例の発振回路は、反転増幅回路
５の入力信号８と、前記反転増幅回路５の出力信号９と
の間に、コイル４を並列に接続し、前記コイル４と入力
信号８の線との接続点とコンデンサ２の一方とを接続
し、前記コンデンサ２の他方とVDD又はVSS1とを接続
し、コイル４と出力信号９の線との接続点とコンデンサ
３の一方とを接続し、前記コンデンサ３の他方とVDD又
はVSS1とを接続し、反転増幅回路５の入力信号８と出力
信号９は、それぞれ差動増幅回路６の入力と接続し、前
記差動増幅回路６の出力と出力端子７とを接続する構成
となっている。In FIG. 1, the oscillator circuit of this embodiment has a coil 4 connected in parallel between an input signal 8 of an inverting amplifier circuit 5 and an output signal 9 of the inverting amplifier circuit 5, and an input signal to the coil 4 is provided. The connection point between the signal 8 line and one of the capacitors 2 is connected, the other end of the capacitor 2 is connected to V DD or V SS 1, and the connection point between the coil 4 and the output signal 9 line and the capacitor 3 are connected. One of them is connected to the other of the capacitors 3 and V DD or V SS 1, and the input signal 8 and the output signal 9 of the inverting amplifier circuit 5 are connected to the inputs of the differential amplifier circuit 6, respectively. The output of the differential amplifier circuit 6 is connected to the output terminal 7.
π型LC共振回路と反転増幅回路５とからなる発振段の入
出力が、次段の差動増幅回路６に入力され、前記差動増
幅回路６の入力の電位差により、出力が反転する。The input / output of the oscillation stage composed of the π-type LC resonance circuit and the inverting amplifier circuit 5 is input to the differential amplifier circuit 6 in the next stage, and the output is inverted due to the potential difference between the inputs of the differential amplifier circuit 6.
以上説明したように、本発明の発振回路によれば、発振
段の反転増幅回路の入出力が、次段の差動増幅回路に入
力する構成となっている為、発振起動時においても、発
振段の反転増幅回路の微弱な電圧変化に対しても、差動
増幅回路が確実に反転出力ができ、迅速に安定発振状態
となる効果がある。As described above, according to the oscillator circuit of the present invention, since the input / output of the inverting amplifier circuit of the oscillation stage is input to the differential amplifier circuit of the next stage, the oscillation occurs even when the oscillation is started. Even if the voltage of the inverting amplifier circuit of the stage is weak, the differential amplifier circuit can surely perform the inverting output, and the stable oscillation state can be quickly achieved.
第１図は本発明の一実施例の発振回路の回路図、第２図
は従来の発振回路の回路図である。 １……第１電源又は第２電源、2,3……コンデンサ、４
……コイル、５……反転増幅回路、６……差動増幅回
路、７……出力端子、８……入力信号、９……出力信
号、10……出力増幅回路。FIG. 1 is a circuit diagram of an oscillator circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional oscillator circuit. 1 ... 1st power supply or 2nd power supply, 2, 3 ... Capacitor, 4
...... Coil, 5 inverting amplifier circuit, 6 ...... differential amplifier circuit, 7 ...... output terminal, 8 …… input signal, 9 …… output signal, 10 …… output amplifier circuit.
Claims (1)
共振回路が接続され、前記反転増幅回路の入力を差動増
幅回路の第１の入力に接続し、前記反転増幅回路の出力
を差動増幅回路の第２の入力に接続し、前記差動増幅回
路の出力を出力端子としたことを特徴とする発振回路。1. A π-type LC between an input and an output of an inverting amplifier circuit.
A resonance circuit is connected, the input of the inverting amplifier circuit is connected to the first input of the differential amplifier circuit, the output of the inverting amplifier circuit is connected to the second input of the differential amplifier circuit, and the differential amplifier is connected. An oscillation circuit characterized in that the output of the circuit is used as an output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27693889A JPH07118611B2 (en) | 1989-10-23 | 1989-10-23 | Oscillator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27693889A JPH07118611B2 (en) | 1989-10-23 | 1989-10-23 | Oscillator circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03139005A JPH03139005A (en) | 1991-06-13 |
| JPH07118611B2 true JPH07118611B2 (en) | 1995-12-18 |
Family
ID=17576498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27693889A Expired - Lifetime JPH07118611B2 (en) | 1989-10-23 | 1989-10-23 | Oscillator circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07118611B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4884405B2 (en) * | 2008-01-23 | 2012-02-29 | 川崎マイクロエレクトロニクス株式会社 | LC oscillator |
| JP2012182663A (en) * | 2011-03-01 | 2012-09-20 | Seiko Instruments Inc | Oscillation circuit and electronic apparatus equipped with oscillation circuit |
-
1989
- 1989-10-23 JP JP27693889A patent/JPH07118611B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03139005A (en) | 1991-06-13 |
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