JPH02161808A - Ring oscillator - Google Patents

Ring oscillator

Info

Publication number
JPH02161808A
JPH02161808A JP63316676A JP31667688A JPH02161808A JP H02161808 A JPH02161808 A JP H02161808A JP 63316676 A JP63316676 A JP 63316676A JP 31667688 A JP31667688 A JP 31667688A JP H02161808 A JPH02161808 A JP H02161808A
Authority
JP
Japan
Prior art keywords
resistance
ion
clock signal
resistance value
injected
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.)
Pending
Application number
JP63316676A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Shimamoto
島本 光裕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP63316676A priority Critical patent/JPH02161808A/en
Publication of JPH02161808A publication Critical patent/JPH02161808A/en
Pending legal-status Critical Current

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  • Semiconductor Integrated Circuits (AREA)

Abstract

PURPOSE:To suppress the variance of the resistance value caused by the external conditions at production and to obtain a highly accurate clock signal by using an ion injected diffusion layer as a resistance to decide an oscillation frequency. CONSTITUTION:An integration circuit part is enclosed by a dotted line, and the oscillation frequency of the integrated circuit is decided by the time constant defined by the resistances 3 and 7 and the capacities of capacitors 4 and 8. Then clock signals (... H L H L H...) are obtained by an odd number of inverters 1, 2, 5, 6 and 9. An ion is injected to an (n) type diffusion layer 12 so that the layer 12 is used as a resistance. Thus the ion injected layer 12 is used as a resistance for decision of an oscillation frequency. As a result, the variance of the resistance value due to the external conditions at production can be suppressed and a highly accurate clock signal is obtained. Furthermore the resistance value is easily controlled by changing the quantity of injected ion at production. The frequency of the clock signal is also easily changed.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、奇数個のインバータが閉ループに接続さね、
2つのインバータ間にコンデンサおよび抵抗が挿入さね
たソングオシレータに関する。
[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a system in which an odd number of inverters are connected in a closed loop.
This relates to a song oscillator in which a capacitor and a resistor are inserted between two inverters.

[従来の技術] 従来、リングオシレータの発振周波数は、2つのインバ
ータ間に挿入されたトランジスタ素子(第4図(1) 
、 <2) 、 <3)のP型トランジスタ18、 N
型トランジスタ19.20.デプレショントランジスタ
)のオン抵抗とコンデンサにより決定されていた。
[Prior art] Conventionally, the oscillation frequency of a ring oscillator is determined by a transistor element inserted between two inverters (see Fig. 4 (1)).
, <2), <3) P-type transistor 18, N
type transistor 19.20. It was determined by the on-resistance of the depletion transistor) and the capacitor.

[発明が解決しようとする課2+!] 1−述した従来のリングオシレータは、発振周波数を決
定する抵抗がトランジスタ素子によって構成されるため
、製造時の抵抗値のばらつきが大きく、その抵抗値も温
度などに大きく依存1−るため、高粒度のクロック信号
が得られないという欠点があり、また、抵抗値を変更す
る場合、トランジスタのディメンシ゛ヨンの変更が必要
となり、多くのコスト・工数をともなうとい・)欠点が
ある。
[Lesson 2+ that the invention attempts to solve! ] 1- In the conventional ring oscillator described above, the resistance that determines the oscillation frequency is composed of a transistor element, so the resistance value varies widely during manufacturing, and the resistance value also greatly depends on temperature etc. It has the disadvantage that a clock signal with high granularity cannot be obtained, and when changing the resistance value, it is necessary to change the dimension of the transistor, which involves a lot of cost and man-hours.

[課題を解決するための手段] 本発明のリングオシレータは、発振周波数を決定するた
めの抵抗として、イオン注入された拡散層が用いられて
いる。
[Means for Solving the Problems] In the ring oscillator of the present invention, an ion-implanted diffusion layer is used as a resistor for determining the oscillation frequency.

[作 用] 発振周波数を決定するための抵抗と1,2てイオン注入
された拡散層を用いることにより、製造時および外的条
件による抵抗値のばらつきをおさえることができ、高精
度のクロック信号を得ることができる。また、製造時に
イオン注入の量を変えることによって容易に抵抗値を調
整し、クロック信号の周波数も容易に変更できる。
[Function] By using a resistor to determine the oscillation frequency and a diffusion layer in which ions are implanted in 1 and 2, variations in resistance value due to manufacturing and external conditions can be suppressed, resulting in a highly accurate clock signal. can be obtained. Furthermore, by changing the amount of ion implantation during manufacturing, the resistance value can be easily adjusted, and the frequency of the clock signal can also be easily changed.

[実施例] 次に、本発明の実施例について図面を参照して説明する
[Example] Next, an example of the present invention will be described with reference to the drawings.

第1図はリングオシレータの一実施例の回路図である。FIG. 1 is a circuit diagram of one embodiment of a ring oscillator.

点線で囲った部分は積分回路であり、抵抗3,7とコン
デンサ4.8の容量による時定数によって発振周波数が
決まり、奇数個のインバータ1,2,5,6.9により
クロック信号(・・・→H−) L→H−+L→H−)
が得られる。
The part surrounded by the dotted line is an integrating circuit, and the oscillation frequency is determined by the time constant of the resistors 3 and 7 and the capacitance of the capacitor 4.8, and the clock signal (...・→H-) L→H-+L→H-)
is obtained.

第2図は本実施例における抵抗の断面図である。IOは
アルミあるいはポリシリによる配線、11は酸化膜、1
2はN型の拡散層、モして13がP型基板である。N型
の拡散層12にイオン注入をすることにより抵抗として
用いる。
FIG. 2 is a sectional view of the resistor in this example. IO is aluminum or polysilicon wiring, 11 is oxide film, 1
2 is an N-type diffusion layer, and 13 is a P-type substrate. By implanting ions into the N-type diffusion layer 12, it is used as a resistor.

第3図は本発明の第2の実施例の断面図である。14は
アルミまたはポリシリによる配線、I5は酸化膜、16
はイオン注入したP型の拡散層、そして17はNウェル
である。本実施例ではN型拡散層のかわりに、P型拡散
層にイオン注入をすることによって抵抗としている。
FIG. 3 is a sectional view of a second embodiment of the invention. 14 is aluminum or polysilicon wiring, I5 is an oxide film, 16
1 is an ion-implanted P type diffusion layer, and 17 is an N well. In this embodiment, instead of the N-type diffusion layer, ions are implanted into the P-type diffusion layer to provide a resistance.

[発明の効果] 以上説明したように本発明は、発振周波数を決定するた
めの抵抗として、イオン注入された拡散層を用いること
により、製造時および外的条件による抵抗値のばらつき
をおさえることができ、高精度のクロック信号を得るこ
とができる効果があり、また、製造時にイオン注入の量
を変えることによって容易に抵抗値を調整し、クロック
信号の周波数も容易に変更できる効果がある。
[Effects of the Invention] As explained above, the present invention uses an ion-implanted diffusion layer as a resistor for determining the oscillation frequency, thereby suppressing variations in resistance value due to manufacturing and external conditions. This has the effect of making it possible to obtain a highly accurate clock signal, and also that the resistance value can be easily adjusted by changing the amount of ion implantation during manufacturing, and the frequency of the clock signal can also be easily changed.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はリングオシレータの一実施例の回路図、第2図
、第3図は本発明による抵抗の断面図、第4図の(1)
 、  (2) 、 (:I)は従来のトランジスタ素
子による抵抗の例である。 1.2,5,6.9−・・インバータ、3.7−・・抵
抗、 4.8−・・コンデンサ、 10、14−・・アルミ(ポリシリ)、11、15−・
・酸化膜、 12−・・イオン注入されたN型拡散層、13−P型基
板、 16−・・イオン注入されたP型拡散層、17−N  
ウェル、 18・・・P型トランジスタ、 19、20−・・N型トランジスタ、 21・・・デプレショントランジスタ。
FIG. 1 is a circuit diagram of an embodiment of a ring oscillator, FIGS. 2 and 3 are cross-sectional views of a resistor according to the present invention, and (1) in FIG.
, (2) , (:I) is an example of a resistance using a conventional transistor element. 1.2, 5, 6.9--inverter, 3.7--resistance, 4.8--capacitor, 10, 14--aluminum (polysilicon), 11, 15--
- Oxide film, 12-...N-type diffusion layer into which ions were implanted, 13-P-type substrate, 16-...P-type diffusion layer into which ions were implanted, 17-N
well, 18...P-type transistor, 19, 20-...N-type transistor, 21...depletion transistor.

Claims (1)

【特許請求の範囲】[Claims] 1、奇数個のインバータが閉ループに接続され、2つの
インバータ間にコンデンサおよび抵抗が挿入されたリン
グオシレータにおいて、抵抗としてイオン注入された拡
散層が用いられていることを特徴とするリングオシレー
タ。
1. A ring oscillator in which an odd number of inverters are connected in a closed loop, and a capacitor and a resistor are inserted between the two inverters, in which an ion-implanted diffusion layer is used as the resistor.
JP63316676A 1988-12-14 1988-12-14 Ring oscillator Pending JPH02161808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63316676A JPH02161808A (en) 1988-12-14 1988-12-14 Ring oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63316676A JPH02161808A (en) 1988-12-14 1988-12-14 Ring oscillator

Publications (1)

Publication Number Publication Date
JPH02161808A true JPH02161808A (en) 1990-06-21

Family

ID=18079670

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63316676A Pending JPH02161808A (en) 1988-12-14 1988-12-14 Ring oscillator

Country Status (1)

Country Link
JP (1) JPH02161808A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5896055A (en) * 1995-11-30 1999-04-20 Matsushita Electronic Industrial Co., Ltd. Clock distribution circuit with clock branch circuits connected to outgoing and return lines and outputting synchronized clock signals by summing time integrals of clock signals on the outgoing and return lines
JP2007134786A (en) * 2005-11-08 2007-05-31 Denso Corp A/d conversion circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5896055A (en) * 1995-11-30 1999-04-20 Matsushita Electronic Industrial Co., Ltd. Clock distribution circuit with clock branch circuits connected to outgoing and return lines and outputting synchronized clock signals by summing time integrals of clock signals on the outgoing and return lines
JP2007134786A (en) * 2005-11-08 2007-05-31 Denso Corp A/d conversion circuit

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