JPH0440004A - Voltage controlled oscillation circuit - Google Patents
Voltage controlled oscillation circuitInfo
- Publication number
- JPH0440004A JPH0440004A JP2147735A JP14773590A JPH0440004A JP H0440004 A JPH0440004 A JP H0440004A JP 2147735 A JP2147735 A JP 2147735A JP 14773590 A JP14773590 A JP 14773590A JP H0440004 A JPH0440004 A JP H0440004A
- Authority
- JP
- Japan
- Prior art keywords
- positive feedback
- circuit
- phase
- oscillation
- signal
- 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
Links
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、共振子等の周波数選択素子を用いた電圧制
御発振回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a voltage controlled oscillation circuit using a frequency selection element such as a resonator.
第２図は従来の電圧制御発振回路を示す回路図である。 FIG. 2 is a circuit diagram showing a conventional voltage controlled oscillation circuit.
第２図において、１はコントロール端子、２はコントロ
ール端子１により供給される制御入力電圧に応じて入力
信号位相に対する出力信号位相を変化させる位相可変器
、３はバッファ回路、４は正帰還増幅器である差動増幅
器、５は発振周波数の可変範囲を決める抵抗、６は発振
周波数を定める共振子、７は発振周波数を微調する容量
である。In Figure 2, 1 is a control terminal, 2 is a phase variable device that changes the output signal phase with respect to the input signal phase according to the control input voltage supplied by control terminal 1, 3 is a buffer circuit, and 4 is a positive feedback amplifier. A differential amplifier, 5 is a resistor that determines the variable range of the oscillation frequency, 6 is a resonator that determines the oscillation frequency, and 7 is a capacitor that finely adjusts the oscillation frequency.
このような従来の電圧制御発振回路の動作を以下説明す
る。The operation of such a conventional voltage controlled oscillation circuit will be explained below.
共振子６は、電気的な等価回路として、容量コイルおよ
び抵抗の直列共振回路とみなすことができる。また共振
子６の直列共振周波数において、点Ｂは交流的に接地さ
れたことになる。したがって差動増幅器４に入力される
信号は、共振子６の直列共振周波数において最も大きく
なる。差動増幅器４は、共振子６の共振周波数を増幅す
る。The resonator 6 can be considered as an electrically equivalent circuit, such as a series resonant circuit of a capacitive coil and a resistor. Further, at the series resonance frequency of the resonator 6, the point B is grounded in an alternating current manner. Therefore, the signal input to the differential amplifier 4 becomes largest at the series resonant frequency of the resonator 6. Differential amplifier 4 amplifies the resonant frequency of resonator 6.
差動増幅器４の出力信号は、位相可変器２およびバッフ
ァ回路３とを通って、差動増幅器４の入力に正帰還する
。The output signal of the differential amplifier 4 passes through the phase variable device 2 and the buffer circuit 3 and is positively fed back to the input of the differential amplifier 4.
このような差動増幅器４２位相可変器２．およびバッフ
ァ回路３から構成される正帰還ループにより発振が持続
される。Such a differential amplifier 42 phase variable device 2. The oscillation is sustained by a positive feedback loop composed of the buffer circuit 3 and the buffer circuit 3.
また正帰還ループを構成する位相可変器２のコントロー
ル端子１に制御入力電圧を供給し、正帰還ループの発振
信号の位相を可変することにより発振周波数を可変する
ことができる。Further, the oscillation frequency can be varied by supplying a control input voltage to the control terminal 1 of the phase variable device 2 constituting the positive feedback loop and varying the phase of the oscillation signal of the positive feedback loop.
しかしながら、このような従来の電圧制御発振回路は、
差動増幅器４および位相可変器２における寄生容量等の
影響により、差動増幅器４９位相可変器２およびバッフ
ァ回路３が構成する正帰還ループの帰還信号に不要な位
相遅れが生じるという問題があった。However, such conventional voltage controlled oscillator circuits
There has been a problem in that due to the influence of parasitic capacitance in the differential amplifier 4 and the phase variable device 2, an unnecessary phase delay occurs in the feedback signal of the positive feedback loop constituted by the differential amplifier 49, the phase variable device 2, and the buffer circuit 3. .
このように正帰還ループの帰還信号に不要な位相遅れが
生じた場合、電圧制御発振回路において重要な特性の一
つである発振周波数の可変範囲の対称性が得られない。If an unnecessary phase delay occurs in the feedback signal of the positive feedback loop as described above, symmetry in the variable range of the oscillation frequency, which is one of the important characteristics in a voltage controlled oscillation circuit, cannot be obtained.
発振周波数の可変範囲の対称性が得られないと、例えば
ＰＬＬループ等に用いられるプルインレンジが非対称に
なるという問題があった。If the oscillation frequency variable range is not symmetrical, there is a problem in that the pull-in range used in, for example, a PLL loop becomes asymmetrical.
この発明の目的は、上記問題点に鑑み、発振周波数の可
変範囲の対称性を得ることのできる電圧制御発振回路を
提供することである。SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a voltage controlled oscillation circuit that can obtain symmetry in the variable range of the oscillation frequency.
この発明の電圧制御発振回路は、発振周波数を定める周
波数選択素子と、この周波数選択素子により選択された
周波数で発振する正帰還増幅器と、この正帰還増幅器の
帰還ループ中に介挿されて制御入力電圧に応じて入力信
号位相に対する出力信号位相を変化させることで正帰還
増幅器の発振周波数を変化させる位相可変器と、正帰還
増幅器の発振信号の位相を所定量遅延させる遅延回路と
、この遅延回路の出力信号を反転して正帰還増幅器の帰
還信号と合成する反転回路とを備え、遅延回路の遅延量
を、正帰還増幅器の発振信号の正帰還増幅器および位相
可変器による位相遅れを補正する量に設定したものであ
る。The voltage controlled oscillator circuit of the present invention includes a frequency selection element that determines the oscillation frequency, a positive feedback amplifier that oscillates at the frequency selected by the frequency selection element, and a control input that is inserted into the feedback loop of the positive feedback amplifier. A phase variable device that changes the oscillation frequency of the positive feedback amplifier by changing the output signal phase relative to the input signal phase according to the voltage, a delay circuit that delays the phase of the oscillation signal of the positive feedback amplifier by a predetermined amount, and this delay circuit. an inverting circuit that inverts the output signal of the positive feedback amplifier and combines it with the feedback signal of the positive feedback amplifier, and the delay amount of the delay circuit is an amount that corrects the phase delay caused by the positive feedback amplifier and the phase variable device of the oscillation signal of the positive feedback amplifier. It is set to .
この発明の構成によれば、遅延回路により正帰還増幅器
の発振信号の位相を所定量遅延させ、反転回路により遅
延回路の出力信号を反転して正帰還増幅器の帰還信号と
合成することにより、正帰還増幅器および位相可変器の
寄生容量等が原因で生じる帰還信号の不要な位相遅れを
補正する。According to the configuration of the present invention, the delay circuit delays the phase of the oscillation signal of the positive feedback amplifier by a predetermined amount, and the inverting circuit inverts the output signal of the delay circuit and combines it with the feedback signal of the positive feedback amplifier. Corrects unnecessary phase delay of the feedback signal caused by parasitic capacitance of the feedback amplifier and phase variable device.
［実施例〕 この発明の一実施例を第１図に基づいて説明する。[Example〕 An embodiment of the present invention will be described based on FIG.
第１図はこの発明の一実施例の電圧制御発振回路を示す
回路図である。FIG. 1 is a circuit diagram showing a voltage controlled oscillation circuit according to an embodiment of the present invention.
第１図において、符号１〜７は第２図に示すものと同一
であるため、説明を雀略する。８は抵抗および９は容量
であり、この抵抗８および容量９は遅延回路１０を構成
している。１１は遅延回路１０の出力信号を反転させる
反転回路である。In FIG. 1, reference numerals 1 to 7 are the same as those shown in FIG. 2, so their explanation will be omitted. 8 is a resistor and 9 is a capacitor, and the resistor 8 and capacitor 9 constitute a delay circuit 10. Reference numeral 11 denotes an inverting circuit that inverts the output signal of the delay circuit 10.
第１図に示すように、周波数選択素子である共振子６に
は、発振周波数を微調する容量７を接続し、この容１７
は接地する。共振子６には抵抗５バッファ回路３および
位相可変器２を接続する。As shown in FIG. 1, a capacitor 7 for finely adjusting the oscillation frequency is connected to the resonator 6, which is a frequency selection element.
is grounded. A five-resistance buffer circuit 3 and a phase variable device 2 are connected to the resonator 6.
抵抗５の両端には、正帰還増幅器である差動増幅器４の
入力端子を接続し、差動増幅器４の出力端子は、位相可
変器２に接続する。差動増幅器４の入力側には遅延回路
ｌＯを接続し、この遅延回路１０には反転回路１１を接
続し、反転回路１１は位相可変器２の出力側に接続する
。The input terminal of a differential amplifier 4 which is a positive feedback amplifier is connected to both ends of the resistor 5, and the output terminal of the differential amplifier 4 is connected to the phase variable device 2. A delay circuit IO is connected to the input side of the differential amplifier 4 , an inverting circuit 11 is connected to the delay circuit 10 , and the inverting circuit 11 is connected to the output side of the phase variable device 2 .
このように構成した電圧制御発振回路の動作を以下説明
する。The operation of the voltage controlled oscillation circuit configured in this way will be described below.
共振子６は差動増幅器４の発振信号の発振周波数を定め
る。差動増幅器４は帰還信号を増幅し位相可変器２に入
力し、バッファ回路３を介して再び差動増幅器４に入力
する。このように差動増幅器４１位相可変器２およびバ
ッファ回路３は正帰還ループを構成し、この正帰還ルー
プにより発振が持続する。この際、遅延回路１０にまり
差動増幅器４の発振信号の位相を所定量遅延させ、反転
回路１１により遅延回路１０の出力信号を反転した後、
差動増幅器４の帰還信号となる位相可変器２の出力信号
と合成することにより、差動増幅器４および位相可変器
２の寄生容量等が原因で生じる帰還信号の不要な位相遅
れを補正する。The resonator 6 determines the oscillation frequency of the oscillation signal of the differential amplifier 4. The differential amplifier 4 amplifies the feedback signal, inputs it to the phase variable device 2, and inputs it to the differential amplifier 4 again via the buffer circuit 3. In this way, the differential amplifier 41, phase variable device 2, and buffer circuit 3 constitute a positive feedback loop, and oscillation is sustained by this positive feedback loop. At this time, after delaying the phase of the oscillation signal of the differential amplifier 4 by a predetermined amount in the delay circuit 10 and inverting the output signal of the delay circuit 10 by the inverting circuit 11,
By combining it with the output signal of the phase variable device 2, which becomes the feedback signal of the differential amplifier 4, unnecessary phase delays in the feedback signal caused by parasitic capacitances of the differential amplifier 4 and the phase variable device 2 are corrected.
なお遅延回路１０による差動増幅器４の発振信号の位相
の遅延量は差動増幅器４および位相可変器２の寄生容量
等により生じる帰還信号の位相遅れを補正する量に設定
する。The amount of phase delay of the oscillation signal of the differential amplifier 4 by the delay circuit 10 is set to an amount that corrects the phase delay of the feedback signal caused by the parasitic capacitance of the differential amplifier 4 and the phase variable device 2.
このようにして正帰還ループの帰還信号の不要な位相遅
れを補正するため、位相可変器２のコントロール端子１
に制御入力電圧を供給することにより得られる発振周波
数の可変範囲の対称性を得ることができる。In this way, in order to correct the unnecessary phase delay of the feedback signal of the positive feedback loop, the control terminal 1 of the phase variable device 2
Symmetry in the variable range of the oscillation frequency can be obtained by supplying a control input voltage to the oscillation frequency.
なおバッファ回路３は必ずしも必要ではない。Note that the buffer circuit 3 is not necessarily required.
この発明の電圧制御発振回路によれば、遅延回路により
正帰還増幅器の発振信号の位相を所定量遅延させ、反転
回路により遅延回路の出力信号を反転して正帰還増幅器
の帰還信号と合成することにより、正帰還増幅器および
位相可変器の寄生容量等が原因で生じる帰還信号の不要
な位相遅れを補正する。その結果、発振周波数の可変範
囲の対称な電圧制御発振回路を得ることができる。According to the voltage controlled oscillator circuit of the present invention, the delay circuit delays the phase of the oscillation signal of the positive feedback amplifier by a predetermined amount, and the inverting circuit inverts the output signal of the delay circuit and combines it with the feedback signal of the positive feedback amplifier. This corrects unnecessary phase delay of the feedback signal caused by parasitic capacitance of the positive feedback amplifier and the phase variable device. As a result, it is possible to obtain a symmetrical voltage controlled oscillation circuit with a variable range of oscillation frequency.
第１図はこの発明の一実施例の電圧制御発振回路を示す
回路図、第２図は従来の電圧制御発振回路を示す回路図
である。
２・・・位相可変器、４・・・差動増幅器（正帰還増幅
器）、６・・・共振子（周波数選択素子）、１０・・・
遅延回路、１１・・・反転回路
２・・・位相可変器
４・・・差動増幅器（正帰還増幅器）
第２図
１１・・・反転回路FIG. 1 is a circuit diagram showing a voltage controlled oscillation circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional voltage controlled oscillation circuit. 2... Phase variable device, 4... Differential amplifier (positive feedback amplifier), 6... Resonator (frequency selection element), 10...
Delay circuit, 11... Inversion circuit 2... Phase variable device 4... Differential amplifier (positive feedback amplifier) Figure 2 11... Inversion circuit
Claims (1)
素子により選択された周波数で発振する正帰還増幅器と
、この正帰還増幅器の帰還ループ中に介挿されて制御入
力電圧に応じて入力信号位相に対する出力信号位相を変
化させることで前記正帰還増幅器の発振周波数を変化さ
せる位相可変器と、前記正帰還増幅器の発振信号の位相
を所定量遅延させる遅延回路と、この遅延回路の出力信
号を反転して前記正帰還増幅器の帰還信号と合成する反
転回路とを備え、 前記遅延回路の遅延量を、前記正帰還増幅器の発振信号
の前記正帰還増幅器および前記位相可変器による位相遅
れを補正する量に設定した電圧制御発振回路。[Claims] A frequency selection element that determines the oscillation frequency, a positive feedback amplifier that oscillates at the frequency selected by the frequency selection element, and a positive feedback amplifier that is inserted in the feedback loop of the positive feedback amplifier and that responds to the control input voltage. a phase variable device that changes the oscillation frequency of the positive feedback amplifier by changing the output signal phase with respect to the input signal phase; a delay circuit that delays the phase of the oscillation signal of the positive feedback amplifier by a predetermined amount; an inverting circuit that inverts an output signal and combines it with a feedback signal of the positive feedback amplifier; A voltage controlled oscillator circuit set to an amount that compensates for.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2147735A JPH0440004A (en) | 1990-06-05 | 1990-06-05 | Voltage controlled oscillation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2147735A JPH0440004A (en) | 1990-06-05 | 1990-06-05 | Voltage controlled oscillation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0440004A true JPH0440004A (en) | 1992-02-10 |
Family
ID=15436961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2147735A Pending JPH0440004A (en) | 1990-06-05 | 1990-06-05 | Voltage controlled oscillation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0440004A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8674776B2 (en) | 2011-09-28 | 2014-03-18 | Seiko Epson Corporation | Oscillator circuit, oscillator, electronic apparatus, and activation method oscillator circuit |
-
1990
- 1990-06-05 JP JP2147735A patent/JPH0440004A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8674776B2 (en) | 2011-09-28 | 2014-03-18 | Seiko Epson Corporation | Oscillator circuit, oscillator, electronic apparatus, and activation method oscillator circuit |
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