JP2016189564A - Oscillation device - Google Patents

Oscillation device Download PDF

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JP2016189564A
JP2016189564A JP2015069198A JP2015069198A JP2016189564A JP 2016189564 A JP2016189564 A JP 2016189564A JP 2015069198 A JP2015069198 A JP 2015069198A JP 2015069198 A JP2015069198 A JP 2015069198A JP 2016189564 A JP2016189564 A JP 2016189564A
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oscillation
rectangular wave
circuit
oscillation circuit
amplifier
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JP6601710B2 (en
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大輔 坂田
Daisuke Sakata
大輔 坂田
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New Japan Radio Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an oscillation device, generating a reference clock signal of a digital circuit, capable of improving a phase noise characteristic of the oscillation device.SOLUTION: The oscillation device is comprised of an oscillation circuit 4 formed from an amplifier 1 for oscillation circuit and an electromechanical oscillator 2 such as a crystal oscillator and a rectangular wave conversion part 3 that converts an oscillation signal of the oscillation circuit into a rectangular wave for output. The oscillation circuit is comprised of a clip type oscillation circuit and clips an oscillation signal from a junction between the electromechanical oscillator and a clap capacitance 8 connected therewith in series. The oscillation signal is input into the rectangular wave conversion part having a predetermined voltage gain and converted into a rectangular wave.SELECTED DRAWING: Figure 1

Description

本発明は、水晶振動子などの電気機械振動子を用いた発振回路から得られた発振信号を、デジタル回路の基準クロック信号等として使用可能な矩形波信号に変換する発振装置に関する。   The present invention relates to an oscillation device that converts an oscillation signal obtained from an oscillation circuit using an electromechanical oscillator such as a crystal oscillator into a rectangular wave signal that can be used as a reference clock signal or the like of a digital circuit.

デジタル回路の安定動作の観点から、動作の基準となる電気信号（基準クロック信号）を作成するクロック用発振装置には、位相雑音の少ない高品質な基準クロック信号を出力することが望まれる。基準クロック信号を生成するために、ＬＣによる正帰還発振回路であるコルピッツ型発振回路が用いられているが、より位相雑音特性に優れるとして知られるクラップ型発振回路を用いているものもある。   From the viewpoint of stable operation of a digital circuit, it is desired to output a high-quality reference clock signal with little phase noise to a clock oscillation device that creates an electrical signal (reference clock signal) that is an operation reference. In order to generate the reference clock signal, a Colpitts type oscillation circuit which is a positive feedback oscillation circuit using LC is used, but there is also a type using a clap type oscillation circuit which is known to have more excellent phase noise characteristics.

図６は直流バイアス回路を省略したＬＣ回路によるクラップ型発振回路である。図６に示すように、発振回路用増幅器１であるトランジスタのベース−エミッタ間に帰還容量９が接続されると共に、トランジスタのコレクタ−エミッタ間に別の帰還容量１０が接続されている。また、トランジスタのベース−コレクタ間には、共振用のクラップ容量８とインダクタ１４の直列回路が接続されている。この種の発振回路では、トランジスタの帰還電圧は２つの帰還容量９，１０による分圧器から決まるが、図６に示すクラップ型発振回路では、発振周波数はクラップ容量８と帰還容量９，１０とインダクタ１４で決まるため、クラップ容量を可変容量に置き換え、発振周波数の調整が可能な電圧制御型水晶発振器（ＶＣＸＯ）の用途でよく使用されている。また、クラップ容量８とインダクタ１４の位置を入れ替えてもクラップ型発振回路としての動作は変わらない。   FIG. 6 shows a clap type oscillation circuit by an LC circuit in which a DC bias circuit is omitted. As shown in FIG. 6, a feedback capacitor 9 is connected between the base and emitter of a transistor that is the oscillation circuit amplifier 1, and another feedback capacitor 10 is connected between the collector and emitter of the transistor. Further, a series circuit of a resonance clap capacitor 8 and an inductor 14 is connected between the base and collector of the transistor. In this type of oscillating circuit, the feedback voltage of the transistor is determined by a voltage divider by two feedback capacitors 9 and 10, but in the crap type oscillation circuit shown in FIG. 6, the oscillation frequency is the crap capacitor 8, the feedback capacitors 9 and 10, and the inductor. Therefore, it is often used in the application of a voltage controlled crystal oscillator (VCXO) that can adjust the oscillation frequency by replacing the clap capacitance with a variable capacitance. Further, even if the positions of the clap capacitor 8 and the inductor 14 are exchanged, the operation as the clap type oscillation circuit does not change.

図７は電気機械振動子の一つである水晶振動子の等価回路図である。水晶振動子には直列共振周波数ｆ１と並列共振周波数ｆ２という位相がゼロになる２つの周波数がある。ｆ１は等価直列インダクタ１５と等価直列容量１６で決まる共振周波数で、ｆ２は等価直列インダクタ１５と等価直列容量１６と並列容量１８で決まる共振周波数であり、ｆ１＜ｆ＜ｆ２という狭い周波数範囲で安定した発振周波数ｆを得ることができる。この周波数範囲では、水晶振動子はインダクタとして働くため、図６のインダクタ１４を水晶振動子に置き換えると、安定した発振周波数が得られるクラップ型発振回路となる。   FIG. 7 is an equivalent circuit diagram of a crystal resonator which is one of electromechanical resonators. There are two frequencies in the crystal resonator, which are a series resonance frequency f1 and a parallel resonance frequency f2, at which the phase becomes zero. f1 is a resonance frequency determined by the equivalent series inductor 15 and the equivalent series capacitance 16, and f2 is a resonance frequency determined by the equivalent series inductor 15, the equivalent series capacitance 16 and the parallel capacitance 18, and is stable in a narrow frequency range of f1 <f <f2. The obtained oscillation frequency f can be obtained. In this frequency range, the crystal resonator functions as an inductor. Therefore, when the inductor 14 in FIG. 6 is replaced with a crystal resonator, a clap-type oscillation circuit that can obtain a stable oscillation frequency is obtained.

従来のデジタル回路用のクロック用発振装置では、図８に示すようにクラップ型発振回路４で構成し、発振回路用増幅器１の入力端子から発振信号を取り出し、後段の負荷によって発振信号が減衰するのを防ぐためのバッファ回路７を経由して、矩形波変換部３に伝送して基準クロック信号用の矩形波を生成している。図８に示すように発振回路用増幅器１の入力端子から発振信号を取り出している発振回路の構成として特許文献１がある。   As shown in FIG. 8, the conventional clock oscillation device for a digital circuit is constituted by a clap oscillation circuit 4, and an oscillation signal is extracted from the input terminal of the oscillation circuit amplifier 1, and the oscillation signal is attenuated by a subsequent load. The signal is transmitted to the rectangular wave converter 3 via the buffer circuit 7 for preventing the occurrence of the rectangular wave for the reference clock signal. As shown in FIG. 8, there is Patent Document 1 as a configuration of an oscillation circuit that extracts an oscillation signal from an input terminal of an oscillation circuit amplifier 1.

一方、デジタル回路用の基準クロック信号の重要な特性である位相雑音特性を向上させるための手段としては、発振回路の出力信号振幅（Ｓ）を大きくしてＳ／Ｎ比を改善するという方法が一般的である。また、特許文献２に開示されているように、発振回路のＱを高くする方法や、特許文献３や特許文献４に開示されているように発振用増幅素子と接続されていない側の端子から発振回路の出力信号を取り出す、といった方法がある。   On the other hand, as means for improving the phase noise characteristic, which is an important characteristic of the reference clock signal for digital circuits, there is a method of improving the S / N ratio by increasing the output signal amplitude (S) of the oscillation circuit. It is common. Further, as disclosed in Patent Document 2, from the method of increasing the Q of the oscillation circuit, or from the terminal on the side not connected to the oscillation amplifying element as disclosed in Patent Document 3 or Patent Document 4. There is a method of taking out the output signal of the oscillation circuit.

特許２６５１９２０号公報Japanese Patent No. 2651920 特開２０００−３２３９２８号公報JP 2000-323928 A 特開２００２−１００９２９号公報JP 2002-1000092 A 特開２００６−１４０７４９号公報JP 2006-140749 A

図８に示すように発振回路用増幅器１の入力端子から発振信号を取り出すと、増幅器が非線形に動作しているために取り出した信号には歪が多く含まれることになる。これにより基準クロック信号のＤｕｔｙずれが発生すること、また矩形波変換にともなう非線形動作で発振回路用増幅器１の１／ｆ雑音が発振周波数を対称軸として折り返されて発振信号に重畳されることにより基準クロック信号の位相雑音特性が悪化するという問題点があった。さらに、クラップ型発振回路４と矩形波変換部３の間にバッファ回路７を入れることにより、バッファ回路７の１／ｆ雑音が発振信号に重畳すると共に発振周波数を対称軸として折り返されて重畳されるため、基準クロック信号の位相雑音特性が悪化するという問題点があった。本発明は上記問題点を解消し、矩形波信号を出力する発振装置の位相雑音特性を改善することを目的とする。   As shown in FIG. 8, when an oscillation signal is extracted from the input terminal of the oscillation circuit amplifier 1, the extracted signal includes a lot of distortion because the amplifier operates nonlinearly. As a result, a duty shift of the reference clock signal occurs, and the 1 / f noise of the oscillation circuit amplifier 1 is folded around the oscillation frequency as a symmetry axis and superimposed on the oscillation signal in a non-linear operation associated with the rectangular wave conversion. There is a problem that the phase noise characteristic of the reference clock signal deteriorates. Further, by inserting the buffer circuit 7 between the clapper type oscillation circuit 4 and the rectangular wave conversion unit 3, 1 / f noise of the buffer circuit 7 is superimposed on the oscillation signal and is folded and superimposed with the oscillation frequency as the symmetry axis. Therefore, there is a problem that the phase noise characteristic of the reference clock signal is deteriorated. An object of the present invention is to solve the above problems and improve the phase noise characteristics of an oscillation device that outputs a rectangular wave signal.

上記目的を達成するために、請求項１にかかる発明は、発振回路用増幅器と電気機械振動子から成る発振回路と、前記発振回路の出力信号を矩形波信号に変換して出力する矩形波変換部から構成される発振装置であって、前記発振回路はクラップ型発振回路で構成し、電気機械振動子と直列に接続されたクラップ容量との接続点から発振信号を取り出して前記矩形波変換部に直接入力すると共に、前記矩形波変換部は１段の増幅器で矩形波変換することを特徴とする。
請求項２にかかる発明は、請求項１に記載の発振装置において、クラップ容量は可変容量であることを特徴とする。
請求項３にかかる発明は、請求項１または請求項２のいずれかに記載の発振装置において、矩形波変換部の増幅器をＣＭＯＳインバータ増幅器で構成したことを特徴とする。
請求項４にかかる発明は、請求項１乃至請求項３のいずれか１項に記載の発振装置において、矩形波変換部の後段に電力増幅部を設けたことを特徴とする。
請求項５にかかる発明は、請求項１乃至請求項４のいずれか１項に記載のクロック用発振装置において、矩形波変換部で外部よりバイアス電圧を設定するよう構成したことを特徴とする。 In order to achieve the above object, an invention according to claim 1 is an oscillation circuit comprising an oscillation circuit amplifier and an electromechanical vibrator, and a rectangular wave converter for converting an output signal of the oscillation circuit into a rectangular wave signal and outputting the rectangular wave signal. The oscillation circuit is configured by a clap oscillation circuit, and an oscillation signal is extracted from a connection point between the electromechanical vibrator and a clap capacitor connected in series, and the rectangular wave conversion unit The rectangular wave conversion unit performs rectangular wave conversion with a single-stage amplifier.
According to a second aspect of the present invention, in the oscillation device according to the first aspect, the clap capacitance is a variable capacitance.
According to a third aspect of the present invention, in the oscillation device according to the first or second aspect, the amplifier of the rectangular wave conversion unit is configured by a CMOS inverter amplifier.
According to a fourth aspect of the present invention, in the oscillation device according to any one of the first to third aspects, a power amplifying unit is provided after the rectangular wave converting unit.
According to a fifth aspect of the present invention, in the clock oscillation device according to any one of the first to fourth aspects, the bias voltage is set from the outside by the rectangular wave conversion unit.

本発明によれば、発振回路をクラップ型発振回路４で構成し、クラップ型発振回路４の電気機械振動子２とクラップ容量８との接続点から発振信号を取り出したことで発振信号の振幅が大きく取れると共に、発振回路用増幅器１と直接接続されずに比較的小さな容量で分離されているため、発振回路の出力波形の歪が小さく、発振を維持するための発振回路用増幅器１の雑音の影響、特に低周波域の雑音の影響も受けにくくなる。その結果、基準クロック信号として用いた場合、Ｄｕｔｙのずれや位相雑音特性を改善することができる。   According to the present invention, the oscillation circuit is constituted by the clap type oscillation circuit 4, and the oscillation signal is extracted from the connection point between the electromechanical vibrator 2 and the clap capacitor 8 of the clap type oscillation circuit 4. Since the oscillation circuit amplifier 1 is not directly connected to the oscillation circuit amplifier 1 but is separated by a relatively small capacity, the distortion of the output waveform of the oscillation circuit is small, and the noise of the oscillation circuit amplifier 1 for maintaining oscillation is reduced. It becomes difficult to be affected by the influence, particularly the noise in the low frequency range. As a result, when used as a reference clock signal, duty shift and phase noise characteristics can be improved.

また、クラップ容量８を可変容量とした場合、従来の回路構成では、可変容量の非線形性や内部抵抗による共振回路のＱの低下により位相雑音特性が悪化するが、本発明の構成とすることで、発振周波数の調整を容易に行うことができる電圧制御型水晶発振器（ＶＣＸＯ）の位相雑音特性を改善することができる。   Further, when the clap capacitor 8 is a variable capacitor, in the conventional circuit configuration, the phase noise characteristic deteriorates due to the non-linearity of the variable capacitor and the Q of the resonance circuit due to the internal resistance. The phase noise characteristics of a voltage controlled crystal oscillator (VCXO) that can easily adjust the oscillation frequency can be improved.

そして、取り出した振幅の大きな発振信号を、バッファ回路を経由せずに、１段の増幅器で矩形波に変換することにより、発振信号以外の雑音を極力重畳させずに矩形波に変換できるため、基準クロック信号のＤｕｔｙのずれや位相雑音特性を改善することができる。なお、矩形波に変換する増幅器は、大きな電圧利得を得ることができるＣＭＯＳインバータ増幅器とするのが最適である。   And, by converting the extracted oscillation signal with a large amplitude into a rectangular wave with a single-stage amplifier without going through a buffer circuit, it can be converted into a rectangular wave without superimposing noise other than the oscillation signal as much as possible. It is possible to improve duty shift and phase noise characteristics of the reference clock signal. The amplifier that converts to a rectangular wave is optimally a CMOS inverter amplifier that can obtain a large voltage gain.

さらに、矩形波変換後に出力負荷のために電力増幅することで、位相雑音特性を悪化させずに必要な負荷能力を備えることができる。
なお、クラップ型発振回路４と矩形波変換部３を結合容量１１を介して接続し、矩形波変換部３の入力部でバイアス電圧を外部から設定することで、位相雑音特性を悪化させずに回路動作に適切な直流バイアス設定を適宜行うことができる。 Furthermore, by amplifying the power for the output load after the rectangular wave conversion, the necessary load capability can be provided without deteriorating the phase noise characteristics.
In addition, the clap type oscillation circuit 4 and the rectangular wave conversion unit 3 are connected via the coupling capacitor 11, and the bias voltage is set from the outside at the input unit of the rectangular wave conversion unit 3, so that the phase noise characteristic is not deteriorated. It is possible to appropriately set a DC bias suitable for circuit operation.

本発明の第１の構成例の発振装置の説明図である。It is explanatory drawing of the oscillation apparatus of the 1st structural example of this invention. 本発明の第１の構成例の発振装置の位相雑音特性を示すグラフである。It is a graph which shows the phase noise characteristic of the oscillation apparatus of the 1st structural example of this invention. ＣＭＯＳインバータ増幅器の説明図である。It is explanatory drawing of a CMOS inverter amplifier. 本発明の第２の構成例の発振装置の説明図である。It is explanatory drawing of the oscillation apparatus of the 2nd structural example of this invention. 本発明の第３の構成例の発振装置の説明図である。It is explanatory drawing of the oscillation apparatus of the 3rd structural example of this invention. 一般的なクラップ型発振回路図の説明図である。It is explanatory drawing of a general clap type oscillation circuit diagram. 水晶振動子の等価回路図である。It is an equivalent circuit diagram of a crystal resonator. 従来のクラップ型発振回路の説明図である。It is explanatory drawing of the conventional clap type oscillation circuit.

本発明の発振装置は、発振回路をクラップ型発振回路で構成し、電気機械振動子と直列に接続されたクラップ容量との接続点から発振信号を取り出し、矩形波変換部に直接入力すると共に、この矩形波変換部は１段の増幅器で矩形波変換するように構成している。以下、本発明の実施例について詳細に説明する。   In the oscillation device of the present invention, the oscillation circuit is configured by a clap oscillation circuit, an oscillation signal is extracted from a connection point between the electromechanical vibrator and the clap capacitor connected in series, and is directly input to the rectangular wave conversion unit. This rectangular wave conversion unit is configured to perform rectangular wave conversion with a single-stage amplifier. Examples of the present invention will be described in detail below.

図１は本発明の第１の構成例であり、クラップ型発振回路４と矩形波変換部３から成る発振装置の説明図である。発振回路から出力される発振信号を、電気機械振動子２とクラップ容量８との接続端子から取り出し、その発振信号を１段の増幅器で矩形波変換する構成となっている。クラップ型発振回路４は、発振回路用増幅器１と帰還容量９，１０とクラップ容量８と電気機械振動子２で構成されている。図１に示すように、発振回路用増幅器１の入力−出力間に帰還容量９が接続されると共に、発振回路用増幅器１の出力−接地間に別の帰還容量１０が接続されており、発振回路用増幅器１の帰還電圧は２つの帰還容量９，１０による分圧器から決まる。また、発振回路用増幅器１の入力−接地間には共振用のクラップ容量８とインダクタ１４の直列回路が接続されており、クラップ型発振回路４の発振周波数は、クラップ容量８と帰還容量９，１０とインダクタ１４で決まる。矩形波変換部３は、増幅器を複数段設けると増幅器の雑音が累積するため、１段で矩形波に変換できる電圧利得を備えたＣＭＯＳインバータ増幅器（図３）で構成されている。ＣＭＯＳインバータ増幅器とすることで大きな電圧利得を得ることができるが、バイポーラトランジスタから成る増幅器とすることも可能である。１段で矩形波に変換できる電圧利得は、クラップ発振回路４から取り出した発振信号の振幅にもよるが、発振周波数における小信号の電圧利得が２０ｄＢ以上であれば十分である。なお、図中では増幅器の直流バイアス等は省略して図示している。   FIG. 1 is an explanatory diagram of an oscillating device comprising a clap type oscillation circuit 4 and a rectangular wave converter 3 according to a first configuration example of the present invention. An oscillation signal output from the oscillation circuit is taken out from a connection terminal between the electromechanical vibrator 2 and the clap capacitor 8, and the oscillation signal is converted into a rectangular wave by a single-stage amplifier. The clap oscillation circuit 4 includes an oscillation circuit amplifier 1, feedback capacitors 9 and 10, a clap capacitor 8, and an electromechanical vibrator 2. As shown in FIG. 1, a feedback capacitor 9 is connected between the input and output of the oscillation circuit amplifier 1, and another feedback capacitor 10 is connected between the output and ground of the oscillation circuit amplifier 1. The feedback voltage of the circuit amplifier 1 is determined by a voltage divider formed by two feedback capacitors 9 and 10. A series circuit of a resonant clap capacitor 8 and an inductor 14 is connected between the input and ground of the oscillation circuit amplifier 1, and the oscillation frequency of the clap type oscillator circuit 4 includes a clap capacitor 8, a feedback capacitor 9, 10 and inductor 14. The rectangular wave conversion unit 3 is composed of a CMOS inverter amplifier (FIG. 3) having a voltage gain that can be converted into a rectangular wave in one stage because the amplifier noise accumulates when a plurality of amplifiers are provided. A large voltage gain can be obtained by using a CMOS inverter amplifier, but an amplifier comprising a bipolar transistor is also possible. The voltage gain that can be converted into a rectangular wave in one stage depends on the amplitude of the oscillation signal extracted from the clap oscillation circuit 4, but it is sufficient if the voltage gain of the small signal at the oscillation frequency is 20 dB or more. In the figure, the direct current bias of the amplifier is omitted.

図１のような構成とすることで、発振回路用増幅器１の入力端子から発振信号を取り出した従来のものと比べて位相雑音特性が改善する。図２は図１に示す発振装置の位相雑音特性を示すグラフであり、図８で説明した従来の発振装置に比べ、位相雑音特性が６〜７ｄＢ程度改善していることがわかる。   With the configuration as shown in FIG. 1, the phase noise characteristic is improved as compared with the conventional one in which the oscillation signal is extracted from the input terminal of the oscillation circuit amplifier 1. FIG. 2 is a graph showing the phase noise characteristics of the oscillation device shown in FIG. 1, and it can be seen that the phase noise characteristics are improved by about 6 to 7 dB compared to the conventional oscillation device described in FIG.

図４は本発明による第２の構成例の発振装置の説明図であり、発振信号を矩形波に変換した後に電力増幅部５を設けた構成となっている。このように構成することで、位相雑音特性を悪化させずに必要な負荷能力を備えることができる。   FIG. 4 is an explanatory diagram of the oscillation device of the second configuration example according to the present invention, in which the power amplification unit 5 is provided after the oscillation signal is converted into a rectangular wave. By configuring in this way, it is possible to provide the necessary load capability without deteriorating the phase noise characteristics.

図５は、本発明による第３の構成例の発振装置の説明図であり、図１および図４の矩形波変換部３の入力バイアス電圧を外部から設定する場合の構成例である。クラップ型発振回路４と矩形波変換部３を結合容量１１を介して接続し、矩形波変換部３の入力部でバイアス電源１３と抵抗１２により外部からバイアス電圧を設定しており、回路動作に適切な直流バイアス設定を適宜行うことができる。このように構成することで、位相雑音特性を悪化させずに適切な直流バイアス設定を行うことができる。   FIG. 5 is an explanatory diagram of the oscillation device of the third configuration example according to the present invention, and is a configuration example when the input bias voltage of the rectangular wave conversion unit 3 of FIGS. 1 and 4 is set from the outside. The clap type oscillation circuit 4 and the rectangular wave conversion unit 3 are connected via a coupling capacitor 11, and a bias voltage is set from the outside by a bias power supply 13 and a resistor 12 at the input unit of the rectangular wave conversion unit 3. Appropriate DC bias settings can be made as appropriate. With this configuration, it is possible to perform appropriate DC bias setting without deteriorating the phase noise characteristics.

また、図１、図４および図５の電気機械振動子２とクラップ容量８の位置を入れ替えても位相雑音特性を改善する効果が得られるため、電気機械振動子２とクラップ容量８の位置を入れ替えた構成としてもよい。またクラップ容量８を可変容量（バラクタ）に置き換えた電圧制御型水晶発振器（ＶＣＸＯ）では、通常は可変容量（バラクタ）の非線形性や内部抵抗による共振回路のＱの低下により位相雑音特性が悪化するが、本発明の構成とすることで電圧制御型水晶発振器（ＶＣＸＯ）の位相雑音特性を改善することができる。さらに、電気機械振動子２として、水晶振動子の他、圧電振動子、ＳＡＷデバイス、ＭＥＭＳ振動子も使用することができる。   In addition, since the effect of improving the phase noise characteristics can be obtained even if the positions of the electromechanical vibrator 2 and the clap capacitor 8 in FIGS. 1, 4 and 5 are exchanged, the positions of the electromechanical vibrator 2 and the clap capacitor 8 are changed. It is good also as the structure replaced. Further, in a voltage controlled crystal oscillator (VCXO) in which the clap capacitor 8 is replaced with a variable capacitor (varactor), the phase noise characteristic is usually deteriorated due to the non-linearity of the variable capacitor (varactor) and the decrease in Q of the resonance circuit due to internal resistance. However, the phase noise characteristic of the voltage controlled crystal oscillator (VCXO) can be improved by adopting the configuration of the present invention. Furthermore, as the electromechanical vibrator 2, a piezoelectric vibrator, a SAW device, and a MEMS vibrator can be used in addition to the crystal vibrator.

１：発振回路用増幅器
２：電気機械振動子を含む共振回路
３：矩形波変換部
４：クラップ型発振回路
５：電力増幅部
６：ＣＭＯＳインバータ増幅器
７：バッファ回路
８：クラップ容量
９，１０：帰還容量
１１：結合容量
１２：抵抗
１３：バイアス電源
１４：インダクタ
１５：等価直列インダクタ
１６：等価直列容量
１７：等価直列抵抗
１８：並列容量 1: Oscillator circuit amplifier 2: Resonant circuit including an electromechanical vibrator 3: Rectangular wave conversion unit 4: Clap type oscillation circuit 5: Power amplifier unit 6: CMOS inverter amplifier 7: Buffer circuit 8: Clap capacitors 9, 10: Feedback capacity 11: Coupling capacity 12: Resistance 13: Bias power supply 14: Inductor 15: Equivalent series inductor 16: Equivalent series capacity 17: Equivalent series resistance 18: Parallel capacity

Claims (5)

発振回路用増幅器と電気機械振動子から成る発振回路と、前記発振回路の出力信号を矩形波信号に変換して出力する矩形波変換部から構成される発振装置であって、
前記発振回路はクラップ型発振回路で構成し、電気機械振動子と直列に接続されたクラップ容量との接続点から発振信号を取り出して前記矩形波変換部に直接入力すると共に、前記矩形波変換部は１段の増幅器で矩形波変換することを特徴とする発振装置。 An oscillation device comprising an oscillation circuit composed of an amplifier for an oscillation circuit and an electromechanical vibrator, and a rectangular wave conversion unit that converts an output signal of the oscillation circuit into a rectangular wave signal and outputs the rectangular wave signal,
The oscillation circuit is formed of a clap type oscillation circuit, and an oscillation signal is taken out from a connection point with a clap capacitor connected in series with an electromechanical vibrator and directly input to the rectangular wave conversion unit, and the rectangular wave conversion unit Is an oscillation device characterized in that rectangular wave conversion is performed by a single-stage amplifier. 請求項１に記載の発振装置において、
前記クラップ容量は、可変容量であることを特徴とする発振装置。 The oscillation device according to claim 1,
The oscillation device according to claim 1, wherein the clap capacitor is a variable capacitor. 請求項１または請求項２のいずれかに記載の発振装置において、
矩形波変換部の増幅器をＣＭＯＳインバータ増幅器で構成したことを特徴とする発振装置。 In the oscillating device according to claim 1 or 2,
An oscillation device characterized in that the amplifier of the rectangular wave conversion unit is constituted by a CMOS inverter amplifier. 請求項１乃至請求項３のいずれか１項に記載の発振装置において、
矩形波変換部の後段に電力増幅部を設けたことを特徴とする発振装置。 The oscillation device according to any one of claims 1 to 3,
An oscillation device comprising a power amplifying unit after a rectangular wave converting unit. 請求項１乃至請求項４のいずれか１項に記載の発振装置において、
矩形波変換部で外部よりバイアス電圧を設定するよう構成したことを特徴とする発振装置。 The oscillation device according to any one of claims 1 to 4,
An oscillation device configured to set a bias voltage from the outside by a rectangular wave conversion unit.
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JPH098549A (en) * 1995-06-16 1997-01-10 Fujitsu Ltd Ecl output crystal oscillator
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Publication number Priority date Publication date Assignee Title
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