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JPH0510845B2 - - Google Patents
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JPH0510845B2 - - Google Patents

Info

Publication number
JPH0510845B2
JPH0510845B2 JP58191393A JP19139383A JPH0510845B2 JP H0510845 B2 JPH0510845 B2 JP H0510845B2 JP 58191393 A JP58191393 A JP 58191393A JP 19139383 A JP19139383 A JP 19139383A JP H0510845 B2 JPH0510845 B2 JP H0510845B2
Authority
JP
Japan
Prior art keywords
circuit
frequency
oscillator
oscillation
resistance value
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
Application number
JP58191393A
Other languages
Japanese (ja)
Other versions
JPS6081921A (en
Inventor
Masabumi Takada
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.)
Denso Corp
Original Assignee
NipponDenso Co Ltd
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 NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to JP58191393A priority Critical patent/JPS6081921A/en
Publication of JPS6081921A publication Critical patent/JPS6081921A/en
Publication of JPH0510845B2 publication Critical patent/JPH0510845B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K3/00Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/027Generators characterised by the type of circuit or by the means used for producing pulses by the use of logic circuits, with internal or external positive feedback
    • H03K3/03Astable circuits

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はIC製品に内蔵された発振器に関する
ものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oscillator built into an IC product.

〔従来技術〕[Prior art]

従来のIC製品内蔵の発振器は、安定した発振
周波数を得るために外部から周波数調整の入力信
号を加えるようにしている。そこでこの入力信号
を取り入れるため、専用の外付端子が必要にな
り、IC製品に設置できる端子数には制限がある
ことから、IC製品1個に持たせられる機能が限
られるという欠点がある。
Conventional IC product built-in oscillators require an external frequency adjustment input signal to obtain a stable oscillation frequency. Therefore, in order to take in this input signal, a dedicated external terminal is required, and since there is a limit to the number of terminals that can be installed on an IC product, there is a drawback that the functions that a single IC product can have are limited.

〔発明の目的〕[Purpose of the invention]

本発明は上記欠点を解決するため、発振器の周
波数調整用外付端子をなくして、内蔵機能を増加
できるIC発振器の提供を目的とするものである。
In order to solve the above-mentioned drawbacks, the present invention aims to provide an IC oscillator that can increase built-in functions by eliminating external terminals for frequency adjustment of the oscillator.

〔実施例〕〔Example〕

以下本発明を図に示す実施例について説明す
る。1は容量C2のコンデンサ10とバリスタ7
の抵抗値によつてその発振周波数が決定される
CR発振回路である。2はCR発振回路1の発振周
波数を電流に変換する機能を持つたスイツチドキ
ヤパシタ回路である。3はスイツチドキヤパシタ
回路2より流れ込んでくる電流を定電圧に変換す
る平滑回路である。4は平滑回路3の出力電圧を
増幅するアンプである。バリシタ7はアンプ4よ
り出力される電圧に応じた可変抵抗値を持つもの
である。8は定電圧Iを出力する定電流源であ
り、9は定電圧Vrefを出力する定電圧源である。
11は容量C1のコンデンサである。
The present invention will be described below with reference to embodiments shown in the drawings. 1 is a capacitor 10 with a capacity of C 2 and a varistor 7
The oscillation frequency is determined by the resistance value of
This is a CR oscillation circuit. 2 is a switched capacitor circuit having the function of converting the oscillation frequency of the CR oscillation circuit 1 into a current. 3 is a smoothing circuit that converts the current flowing from the switched capacitor circuit 2 into a constant voltage. 4 is an amplifier that amplifies the output voltage of the smoothing circuit 3. The varisitor 7 has a variable resistance value depending on the voltage output from the amplifier 4. 8 is a constant current source that outputs a constant voltage I, and 9 is a constant voltage source that outputs a constant voltage Vref.
11 is a capacitor with a capacity of C1 .

次に上記構成においてその作動を説明する。ス
イツチドキヤパシタ回路2は、スイツチ部6が
CR発振回路1の発振周波数fに同期して動作す
るものとすれば第2図の等価回路で考えることが
できる。すなわちCR発振回路1が周波数で発
振していれば平滑回路3にI0−I(ただしI0=C1
Vref・f)の電流が流れ込むことがわかる。平
滑回路3はこれを定電圧に変換し、さらにアンプ
4によつてバリスタ7にはスイツチドキヤパシタ
回路2の平均電流であるC1reff−Iの大きさに応
じた電圧が加わることになる。バリスタ7は加わ
る電圧によつてその抵抗値が変わるから、結局、
検出された発振周波数の値によつてバリスタ7
の抵抗値が変わることになる。
Next, the operation of the above configuration will be explained. In the switched capacitor circuit 2, the switch section 6 is
Assuming that it operates in synchronization with the oscillation frequency f of the CR oscillation circuit 1, the equivalent circuit shown in FIG. 2 can be considered. In other words, if the CR oscillation circuit 1 oscillates at the frequency, the smoothing circuit 3 receives I 0 −I (I 0 =C 1
It can be seen that a current of Vref·f) flows into the circuit. The smoothing circuit 3 converts this into a constant voltage, and the amplifier 4 applies a voltage to the varistor 7 according to the magnitude of C 1 reff-I, which is the average current of the switched capacitor circuit 2. . The resistance value of the varistor 7 changes depending on the applied voltage, so in the end,
Depending on the detected oscillation frequency value, the varistor 7
The resistance value of will change.

一方本実施例のCR発振回路1の発振周波数
とバリスタ7の抵抗値Rの関係は次式にて表示さ
れる。
On the other hand, the relationship between the oscillation frequency of the CR oscillation circuit 1 and the resistance value R of the varistor 7 of this embodiment is expressed by the following equation.

=K1/C2R …(1) またフイードバツク補償手段としてのスイツチド
キヤパシタ回路2、平滑回路3およびアンプ4
は、アンプ4の出力電圧をVBとすると VB=−K′(C1Vre・−I) …(2) 1/R=K″VB …(3) という関係があり、上記(2),(3)式から以下の(4)式
が成立する。
=K 1 /C 2 R...(1) Also, the switched capacitor circuit 2, smoothing circuit 3 and amplifier 4 as feedback compensation means
If the output voltage of amplifier 4 is V B , there is a relationship as follows: V B = -K'(C 1 Vre・-I)...(2) 1/R=K″V B ...(3), and the above (2) ), Equation (4) below holds from Equation (3).

1/R=−K2(C1Vref・f−I) …(4) 以上(1)〜(4)式に沿つて制御のしくみを、バリス
タ7の抵抗値がR=R0で目標値周波数が=0
の場合について述べる。今発振周波数が何らかの
原因でΔ増えたとすると、(4)式からバリスタ7
の抵抗値は、 Δ(1/R)=df(1/R)・Δ/d= −K2C1Vre・Δ …(5) の(5)式から求められる分補正される。すなわち抵
抗値R0は1/R0であつたものが 1/R0−K2C1Vre・Δに補正される。従つて
変動した発振周波数0+Δは K1/C2(1/R0−K2C1VreΔ)+Δであつて
(1)式より0=K1/C2R0であるから 0−(K1K2C1Vre/C2−1)Δに補正される。
1/R=-K 2 (C 1 Vref・f-I) ...(4) The control mechanism is set according to equations (1) to (4) above, and the resistance value of varistor 7 is set to the target value when R=R 0 . frequency = 0
Let's discuss the case. If the oscillation frequency increases by Δ for some reason, then from equation (4), the varistor 7
The resistance value is corrected by the amount determined from equation (5): Δ(1/R)=df(1/R)・Δ/d=−K 2 C 1 Vre・Δ (5). That is, the resistance value R 0 which was 1/R 0 is corrected to 1/R 0 −K 2 C 1 Vre·Δ. Therefore, the changed oscillation frequency 0 +Δ is K 1 /C 2 (1/R 0 −K 2 C 1 VreΔ) + Δ.
Since 0 = K 1 /C 2 R 0 from equation (1), it is corrected to 0 - (K 1 K 2 C 1 Vre/C 2 -1)Δ.

ここでK1K2C1Vre/C2=1となるよう回路設
計が行われていれば、発振周波数は目標値周波
0にただちに補正されることになる。以上フイ
ードバツク補償の動作で、このシステムは目標値
周波数0で安定して発振を行う。
Here, if the circuit is designed so that K 1 K 2 C 1 Vre/C 2 =1, the oscillation frequency will be immediately corrected to the target value frequency 0 . With the above feedback compensation operation, this system stably oscillates at the target value frequency of 0 .

又、このCR発振回路1が仕様周波数で安定
に発振するようにフイードバツク補償手段のスイ
ツチドキヤパシタ回路2、平滑回路3及びアンプ
4が機能するためには、式(5)が正確に満足されて
いなければならないが、これはスイツチドキヤパ
シタ回路2のコンデンサ11とCR発振回路1の
コンデンサ10の容量の比C1/C2の調整によつ
て可能である。そしてこの容量の比C1/C2の絶
対値が設計値どうりになるようにコンデンサ1
0,11を製造することはICのMOSプロセスで
は容易である。よつてこの回路構成で極めて良好
な安定性を持つ発振回路を実現することができ
る。
In addition, in order for the switched capacitor circuit 2, smoothing circuit 3, and amplifier 4 of the feedback compensation means to function so that the CR oscillation circuit 1 stably oscillates at the specified frequency, equation (5) must be accurately satisfied. However, this can be done by adjusting the ratio C 1 /C 2 of the capacitances of the capacitor 11 of the switched capacitor circuit 2 and the capacitor 10 of the CR oscillation circuit 1. Then, capacitor 1 is adjusted so that the absolute value of this capacitance ratio C 1 /C 2 is as designed.
It is easy to manufacture 0 and 11 using an IC MOS process. Therefore, with this circuit configuration, an oscillation circuit with extremely good stability can be realized.

〔発明の効果〕〔Effect of the invention〕

以上述べたように本発明によれば、IC発振器
の、印加電圧によつて抵抗値の変化する抵抗体
を、このIC発振器の出力周波数に応じてフイー
ドバツク補償することによつて、ICに周波数調
整用信号を入力するための外付端子を不要にして
いるから、IC発振器の内蔵機能を増加できると
いう優れた効果がある。
As described above, according to the present invention, frequency adjustment is provided to the IC by feedback-compensating the resistor of the IC oscillator whose resistance value changes depending on the applied voltage according to the output frequency of the IC oscillator. This eliminates the need for external terminals for inputting signals, which has the excellent effect of increasing the built-in functions of the IC oscillator.

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

第1図は本発明の一実施例の構成図、第2図は
等価回路である。 1……CR発振回路、2……スイツチドキヤパ
シタ回路、3……平滑回路、4……アンプ、7…
…バリスタ。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an equivalent circuit. 1...CR oscillation circuit, 2...Switched capacitor circuit, 3...Smoothing circuit, 4...Amplifier, 7...
...Barista.

Claims (1)

【特許請求の範囲】[Claims] 1 コンデンサと抵抗体による放電を利用した
IC発振器において、前記抵抗体は印加電圧によ
つて抵抗値の変化する抵抗体であり、前記IC発
振器の出力周波数から前記抵抗体の印加電圧を制
御するフイードバツク補償手段を設けたことを特
徴とするIC発振器。
1 Using discharge from a capacitor and resistor
In the IC oscillator, the resistor is a resistor whose resistance value changes depending on the applied voltage, and is characterized in that it is provided with feedback compensation means for controlling the voltage applied to the resistor from the output frequency of the IC oscillator. IC oscillator.
JP58191393A 1983-10-12 1983-10-12 Ic oscillator Granted JPS6081921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58191393A JPS6081921A (en) 1983-10-12 1983-10-12 Ic oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58191393A JPS6081921A (en) 1983-10-12 1983-10-12 Ic oscillator

Publications (2)

Publication Number Publication Date
JPS6081921A JPS6081921A (en) 1985-05-10
JPH0510845B2 true JPH0510845B2 (en) 1993-02-10

Family

ID=16273854

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58191393A Granted JPS6081921A (en) 1983-10-12 1983-10-12 Ic oscillator

Country Status (1)

Country Link
JP (1) JPS6081921A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4626498B2 (en) 2005-02-28 2011-02-09 株式会社デンソー Microcomputer

Also Published As

Publication number Publication date
JPS6081921A (en) 1985-05-10

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