JP2012195833A - Multi-frequency oscillator - Google Patents

Multi-frequency oscillator Download PDF

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JP2012195833A
JP2012195833A JP2011059347A JP2011059347A JP2012195833A JP 2012195833 A JP2012195833 A JP 2012195833A JP 2011059347 A JP2011059347 A JP 2011059347A JP 2011059347 A JP2011059347 A JP 2011059347A JP 2012195833 A JP2012195833 A JP 2012195833A
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frequency
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Hiroshi Harada
博司 原田
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Yokogawa Denshikiki Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a multi-frequency oscillator that is more excellent in the stability of oscillatory frequencies and the transient response of frequencies than conventional ones.SOLUTION: The multi-frequency oscillator includes a reference signal generator 12 that has at least a crystal oscillator and regulates oscillatory frequencies of the crystal oscillator with a modulation signal input from a modulation signal generator 5; a phase comparator 6; a loop filter 7; and a voltage control oscillator 8, and further includes a PLL 11 that phase-compares an output of the reference signal generator 12 to that of the voltage control oscillator 8 with the phase comparator 6.

Description

本発明は、複数の周波数の信号を発振する多周波発振器に関する。   The present invention relates to a multi-frequency oscillator that oscillates a signal having a plurality of frequencies.

多周波ＣＷ方式の距離センサは、複数の周波数の信号（送信信号）を対象物に照射し、当該送信信号の反射信号を検出することにより対象物の移動速度を計測する装置である。このような多周波ＣＷ方式の距離センサは、対象物の移動に基づく反射信号のドップラシフト（周波数偏移）を検出することにより対象物の移動速度を計測するものであり、送信信号として連続波信号（ＣＷ信号）を用いる。   A multi-frequency CW-type distance sensor is a device that measures the moving speed of an object by irradiating the object with a plurality of frequency signals (transmission signals) and detecting a reflection signal of the transmission signal. Such a multi-frequency CW-type distance sensor measures the moving speed of an object by detecting a Doppler shift (frequency shift) of a reflected signal based on the movement of the object, and transmits a continuous wave as a transmission signal. A signal (CW signal) is used.

このような多周波ＣＷ方式の距離センサでは、電圧制御発振器（ＶＣＯ）にステップ信号を変調信号として入力することによりステップ電圧に応じた複数の周波数信号を発生さる多周波発振器、あるいはＰＬＬのループフィルタの出力にステップ信号（変調信号）を加算することによりステップ電圧に応じた複数の周波数信号を発生さる多周波発振器が採用されている。例えば、下記特許文献１には、このような多周波ＣＷ方式の距離センサの一例が開示されている。   In such a multi-frequency CW-type distance sensor, a step signal is input as a modulation signal to a voltage controlled oscillator (VCO) to generate a plurality of frequency signals corresponding to the step voltage, or a PLL loop filter. A multi-frequency oscillator that generates a plurality of frequency signals in accordance with the step voltage by adding a step signal (modulation signal) to the output of is used. For example, Patent Document 1 below discloses an example of such a multi-frequency CW type distance sensor.

特開２００６−２５８７０９号公報JP 2006-258709 A

ところで、上記２つの方式の多周波発振器のうち、前者は発振周波数がオープンループ（開ループ）で制御される方式なので、前者には発振周波数の安定性が悪いという問題がある。また、後者は発振周波数がクローズドループ（閉ループ）で制御される方式なので、ループフィルタの時定数やループゲインにも依るが、発振周波数の安定性に優れているものの発振周波数の切換時点における過渡的な周波数応答が悪いために、周波数が安定している時間幅が狭くなるという問題がある。したがって、このような多周波発振器を用いた多周波ＣＷ方式の距離センサは、送信信号の周波数品質に起因する距離計測誤差が発生する。   By the way, among the above-mentioned two types of multi-frequency oscillators, the former is a method in which the oscillation frequency is controlled in an open loop (open loop), and therefore the former has a problem that the oscillation frequency is not stable. The latter is a method in which the oscillation frequency is controlled in a closed loop (closed loop), so although it depends on the time constant and loop gain of the loop filter, it has excellent oscillation frequency stability but is transient at the time of oscillation frequency switching. Because of the poor frequency response, there is a problem that the time width during which the frequency is stable becomes narrow. Therefore, a multi-frequency CW type distance sensor using such a multi-frequency oscillator generates a distance measurement error due to the frequency quality of the transmission signal.

本発明は、このような事情に鑑みてなされたものであり、発振周波数の安定性及び周波数の過渡応答性に優れた多周波発振器を提供することを目的とするものである。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a multi-frequency oscillator having excellent oscillation frequency stability and frequency transient response.

上記目的を達成するために、本発明では、多周波発振器に係る第１の解決手段として、水晶振動子を少なくとも備え、変調信号発生器から入力された変調信号によって水晶振動子の発振周波数を調整する基準信号発生器と、位相比較器、ループフィルタ及び電圧制御発振器を少なくとも備え、基準信号発生器の出力と電圧制御発振器の出力とを位相比較器で位相比較するＰＬＬとを具備する、という手段を採用する。   In order to achieve the above object, in the present invention, as a first solution for a multi-frequency oscillator, at least a crystal resonator is provided, and an oscillation frequency of the crystal resonator is adjusted by a modulation signal input from a modulation signal generator And a reference signal generator including at least a phase comparator, a loop filter, and a voltage controlled oscillator, and a PLL that compares the output of the reference signal generator and the output of the voltage controlled oscillator with a phase comparator. Is adopted.

多周波発振器に係る第２の解決手段として、上記第１の手段において、電圧制御発振器と位相比較器との間に分周期を備える
、という手段を採用する。 As a second solving means related to the multi-frequency oscillator, a means is adopted in which a dividing period is provided between the voltage controlled oscillator and the phase comparator in the first means.

また、本発明では、多周波送信器に係る解決手段として、上記第１または第２の解決手段に係る多周波発振器と、電圧制御発振器の出力に接続された送信アンテナとを具備する、という手段を採用する。   Further, in the present invention, as means for solving the multi-frequency transmitter, means comprising the multi-frequency oscillator according to the first or second means and a transmitting antenna connected to the output of the voltage-controlled oscillator. Is adopted.

本発明によれば、変調信号発生器から入力された変調信号によって水晶振動子の発振周波数を調整する基準信号発生器を備え、当該基準信号発生器の出力と電圧制御発振器の出力とをＰＬＬループを構成する位相比較器で位相比較するので、発振周波数の安定性及び周波数の過渡応答性において従来よりも優れた多周波発振器を提供することが可能である。   According to the present invention, there is provided a reference signal generator that adjusts the oscillation frequency of a crystal resonator according to a modulation signal input from a modulation signal generator, and an output of the reference signal generator and an output of a voltage controlled oscillator are connected to a PLL loop. Therefore, it is possible to provide a multi-frequency oscillator that is superior to the conventional one in terms of stability of oscillation frequency and transient response of frequency.

本発明の一実施形態に係る多周波送信器Ａの機能構成を示す回路図である。It is a circuit diagram which shows the function structure of the multifrequency transmitter A which concerns on one Embodiment of this invention. 本発明の一実施形態に係る多周波送信器Ａの性能を示す特性図である。It is a characteristic view which shows the performance of the multifrequency transmitter A which concerns on one Embodiment of this invention.

以下、図面を参照して、本発明の一実施形態について説明する。
本実施形態に係る多周波送信器Ａは、図１に示すように、水晶振動子発振用ＩＣ１、３つのコンデンサ２〜４、変調信号発生器５、位相比較器６、ループフィルタ７、ＶＣＯ８（電圧制御発振器：Voltage Controled Oscilator）、分周器９及び送信アンテナ１０から構成されている。このような多周波送信器Ａは、多周波ＣＷ方式の距離センサの一部（送信部）を構成するものである。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the multi-frequency transmitter A according to the present embodiment includes a crystal oscillator oscillation IC 1, three capacitors 2 to 4, a modulation signal generator 5, a phase comparator 6, a loop filter 7, a VCO 8 ( A voltage controlled oscillator (Voltage Controlled Oscilator), a frequency divider 9 and a transmission antenna 10 are included. Such a multi-frequency transmitter A constitutes a part (transmission unit) of a multi-frequency CW type distance sensor.

また、上記各構成要素のうち、位相比較器６、ループフィルタ７、ＶＣＯ８及び分周器９はＰＬＬ（Phase Lock Loop）１１を構成している。また、水晶振動子発振用ＩＣ１、３つのコンデンサ２〜４及び変調信号発生器５は、このようなＰＬＬ１１に対して基準信号を提供する基準信号発生器１２を構成している。   Of the above-described components, the phase comparator 6, the loop filter 7, the VCO 8 and the frequency divider 9 constitute a PLL (Phase Lock Loop) 11. The crystal oscillator oscillation IC 1, the three capacitors 2 to 4, and the modulation signal generator 5 constitute a reference signal generator 12 that provides a reference signal to the PLL 11.

水晶振動子発振用ＩＣ１は、水晶振動子と増幅器とからなる発振専用ＩＣであり、外付け部品としての３つのコンデンサ２〜４と共に発振回路を構成する。周知のように、水晶振動子を用いた発振回路は、圧電体やＬＣ共振回路を用いた発振回路に比べて極めて高いＱの発振特性を有する。すなわち、水晶振動子発振用ＩＣ１と３つのコンデンサ２〜４とからなる発振回路は、周波数純度が極めて高い信号を上記基準信号として位相比較器６に出力する。   The crystal oscillator oscillation IC 1 is an oscillation-dedicated IC including a crystal oscillator and an amplifier, and constitutes an oscillation circuit together with three capacitors 2 to 4 as external components. As is well known, an oscillation circuit using a crystal resonator has extremely high Q oscillation characteristics compared to an oscillation circuit using a piezoelectric body or an LC resonance circuit. That is, the oscillation circuit including the crystal oscillator oscillation IC 1 and the three capacitors 2 to 4 outputs a signal having a very high frequency purity to the phase comparator 6 as the reference signal.

３つのコンデンサ２〜４は、上記水晶振動子と共に発振条件を満足させるための静電容量を水晶振動子発振用ＩＣ１に提供する２端子の外付け部品である。上記水晶振動子発振用ＩＣ１は、３つのコンデンサ２〜４が接続されることにより所定の発振条件を満たし、自励発振可能な状態となる。このような３つのコンデンサ２〜４のうち、コンデンサ２及びコンデンサ３は、図示するように水晶振動子発振用ＩＣ１の所定の接続端子とグランド（接地）との間に直列接続された状態で挿入されている。なお、コンデンサ３は、図示するように静電容量が調整可能な可変コンデンサである。   The three capacitors 2 to 4 are two-terminal external components that provide the crystal oscillator oscillation IC 1 with capacitance for satisfying the oscillation condition together with the crystal oscillator. The crystal oscillator oscillation IC 1 is connected to the three capacitors 2 to 4 to satisfy a predetermined oscillation condition and to be in a state capable of self-excited oscillation. Of these three capacitors 2 to 4, the capacitor 2 and the capacitor 3 are inserted in a state of being connected in series between a predetermined connection terminal of the crystal resonator oscillation IC 1 and a ground (ground) as shown in the figure. Has been. The capacitor 3 is a variable capacitor whose capacitance can be adjusted as shown in the figure.

すなわち、コンデンサ２の一端は水晶振動子発振用ＩＣ１の接続端子に接続され、コンデンサ２の他端はコンデンサ３の一端に接続され、コンデンサ３の他端はグランド（接地）に接続されている。また、残りのコンデンサ４は、上記接続端子とは異なる水晶振動子発振用ＩＣ１の接続端子とグランド（接地）との間に挿入されている。すなわち、コンデンサ４の一端は水晶振動子発振用ＩＣ１の接続端子に接続され、コンデンサ４の他端はグランド（接地）に接続されている。   That is, one end of the capacitor 2 is connected to the connection terminal of the crystal oscillator oscillation IC 1, the other end of the capacitor 2 is connected to one end of the capacitor 3, and the other end of the capacitor 3 is connected to the ground (ground). The remaining capacitor 4 is inserted between the connection terminal of the crystal oscillator oscillation IC 1 different from the connection terminal and the ground. That is, one end of the capacitor 4 is connected to the connection terminal of the crystal oscillator oscillation IC 1 and the other end of the capacitor 4 is connected to the ground (ground).

変調信号発生器５は、所定周期かつ電圧のステップ信号を水晶振動子発振用ＩＣ１に対する変調信号として生成・出力するものであり、図示するように出力端が上記コンデンサ２とコンデンサ３との接続点に接続されている。この変調信号発生器５が出力する変調信号は、上記水晶振動子発振用ＩＣ１の出力周波数をステップ状に変動させるためものである。すなわち、水晶振動子発振用ＩＣ１は、コンデンサ２を介して変調信号が入力されると、当該変調信号のステップ電圧に応じて出力周波数を変化させる。   The modulation signal generator 5 generates and outputs a step signal having a predetermined period and voltage as a modulation signal for the crystal oscillator oscillation IC 1, and an output terminal is a connection point between the capacitor 2 and the capacitor 3 as shown in the figure. It is connected to the. The modulation signal output from the modulation signal generator 5 is for changing the output frequency of the crystal oscillator oscillation IC 1 in a stepwise manner. That is, when a modulation signal is input via the capacitor 2, the crystal oscillator oscillation IC 1 changes the output frequency according to the step voltage of the modulation signal.

位相比較器６は、分周器９から入力される分周信号を比較信号として上記基準信号と位相比較し、両者の位相誤差に応じた誤差信号をループフィルタ７に出力する。ループフィルタ７は、抵抗（Ｒ）とコンデンサ（Ｃ）とから構成されたローパスフィルタ（低域通過フィルタ）である。すなわち、ループフィルタ７は、抵抗の抵抗値とコンデンサの静電容量とによって規定される時定数に基づいて、上記誤差信号に含まれる高周波成分を除去し、直流成分をも含む低周波成分のみを電圧制御信号としてＶＣＯ８に出力する。   The phase comparator 6 performs phase comparison with the reference signal using the frequency-divided signal input from the frequency divider 9 as a comparison signal, and outputs an error signal corresponding to the phase error between the two to the loop filter 7. The loop filter 7 is a low-pass filter (low-pass filter) composed of a resistor (R) and a capacitor (C). That is, the loop filter 7 removes the high frequency component included in the error signal based on the time constant defined by the resistance value of the resistor and the capacitance of the capacitor, and only the low frequency component including the DC component. Output to the VCO 8 as a voltage control signal.

ＶＣＯ８は、電圧制御信号によって発振周波数が規定される発振回路である。すなわち、ＶＣＯ８は、上記比較信号と基準信号との位相誤差に応じた周波数の発振信号を分周器９及び送信アンテナ１０に出力する。分周器９は、上記発振信号を所定の分周比Ｎで分周することにより低周波化する。この分周器９は、このような低周波化された信号、つまり発振信号の周波数を分周比Ｎで除算した周波数の信号を上記比較信号として位相比較器６に出力する。なお、この分周器９は、ＰＬＬ１１の必須構成要素ではなく、必要に応じて削除してもよい。   The VCO 8 is an oscillation circuit whose oscillation frequency is defined by a voltage control signal. That is, the VCO 8 outputs an oscillation signal having a frequency corresponding to the phase error between the comparison signal and the reference signal to the frequency divider 9 and the transmission antenna 10. The frequency divider 9 lowers the frequency by dividing the oscillation signal by a predetermined frequency division ratio N. The frequency divider 9 outputs such a low frequency signal, that is, a signal having a frequency obtained by dividing the frequency of the oscillation signal by the frequency division ratio N, to the phase comparator 6 as the comparison signal. The frequency divider 9 is not an essential component of the PLL 11 and may be deleted as necessary.

送信アンテナ１０は、上記ＶＣＯ８から入力された発振信号を電波として外部に放射するものである。例えば、多周波ＣＷ方式の距離センサでは、マイクロ波帯の送信波を移動体に放射し、その反射波を受信することによって移動体の速度を計測するが、送信アンテナ１０は、上記マイクロ波帯の送信波を移動体に放射するパッチアンテナ（マイクロストリップアンテナ）である。   The transmitting antenna 10 radiates the oscillation signal input from the VCO 8 to the outside as a radio wave. For example, in a multi-frequency CW-type distance sensor, a transmission wave in the microwave band is radiated to the moving body, and the speed of the moving body is measured by receiving the reflected wave. This is a patch antenna (microstrip antenna) that radiates the transmitted wave to the moving body.

次に、このように構成された多周波送信器Ａの動作について、図２をも参照して詳しく説明する。   Next, the operation of the thus configured multi-frequency transmitter A will be described in detail with reference to FIG.

図２（ａ）は、変調信号発生器５が出力する変調信号の波形を示している。この図に示すように、変調信号は、一定周期でロー電圧とハイ電圧とがステップ状に繰り返すステップ信号である。図２（ｂ）は、このような変調信号が入力されることで水晶振動子発振用ＩＣ１から出力される基準信号の周波数変化を示している。この図に示すように、基準信号は、上記変調信号のロー電圧の期間ＴＬでは周波数ｆａとなり、ハイ電圧の期間ＴＨでは周波数ｆａとは異なる周波数ｆｂにステップ状に変化する信号である。すなわち、基準信号は、変調信号の波形に対して周波数が極めて応答性良く変化する信号である。 FIG. 2A shows the waveform of the modulation signal output from the modulation signal generator 5. As shown in this figure, the modulation signal is a step signal in which a low voltage and a high voltage are repeated in a stepwise manner at a constant period. FIG. 2B shows a change in the frequency of the reference signal output from the crystal oscillator oscillation IC 1 when such a modulation signal is input. As shown in this figure, the reference signal, the period T L at the frequency fa becomes low voltage of the modulation signal, the period of the high voltage T H at the frequency fa which is a signal that changes stepwise in the different frequency fb. That is, the reference signal is a signal whose frequency changes with a very high response to the waveform of the modulation signal.

このような基準信号がＰＬＬ１１内の位相比較器６に入力されると、位相比較器６から出力される誤差信号がループフィルタ７を介してＶＣＯ８に入力さることに起因してＶＣＯ８の発振周波数が調整されるので、比較信号として位相比較器６に入力される分周信号は、周波数が基準信号の周波数に引き込まれ（周波数ロック）、さらに位相も基準信号の位相に同期する（位相ロック）。   When such a reference signal is input to the phase comparator 6 in the PLL 11, the error signal output from the phase comparator 6 is input to the VCO 8 via the loop filter 7, resulting in an oscillation frequency of the VCO 8. Since the frequency is adjusted, the frequency of the frequency-divided signal input to the phase comparator 6 as a comparison signal is drawn to the frequency of the reference signal (frequency lock), and the phase is also synchronized with the phase of the reference signal (phase lock).

上記周波数ロック及び位相ロックが成立した状態において、比較信号（分周信号）の周波数は基準信号の周波数と等しくなるので、ＶＣＯ８の発振周波数つまり発振信号の周波数は、基準信号の周波数のＮ倍つまり基準信号の周波数に分周器９の分周比Ｎを乗算した周波数となる。図２（ｃ）の実線は、上記発振信号（送信信号）の周波数変化を示しているが、当該周波数変化は、基準信号の周波数変化つまり変調信号の電圧変化に極めて忠実な変化である。   Since the frequency of the comparison signal (frequency-divided signal) is equal to the frequency of the reference signal in the state where the frequency lock and the phase lock are established, the oscillation frequency of the VCO 8, that is, the frequency of the oscillation signal is N times the frequency of the reference signal. The frequency is obtained by multiplying the frequency of the reference signal by the frequency division ratio N of the frequency divider 9. The solid line in FIG. 2C shows the frequency change of the oscillation signal (transmission signal). The frequency change is very faithful to the frequency change of the reference signal, that is, the voltage change of the modulation signal.

これに対して、図２（ｃ）に二点鎖線で示す周波数変化は、ＰＬＬのループフィルタの出力にステップ状の変調信号を加算する従来の多周波送信器の周波数変化を示している。すんわち、従来の周波数変化は、ＰＬＬのループフィルタの出力にステップ状の変調信号を加算するもの、つまりＰＬＬ内に変調信号を加えるものなので、ＰＬＬにおけるループフィルタの時定数及びループゲイン等の影響によって、変調信号の電圧変化に対して応答性が悪い。   On the other hand, the frequency change indicated by a two-dot chain line in FIG. 2C shows the frequency change of the conventional multi-frequency transmitter that adds the step-like modulation signal to the output of the PLL loop filter. In other words, the conventional frequency change is the addition of a stepped modulation signal to the output of the loop filter of the PLL, that is, the addition of the modulation signal in the PLL, so the time constant and loop gain of the loop filter in the PLL, etc. Due to the influence, the response to the voltage change of the modulation signal is poor.

本多周波送信器Ａによれば、基準信号の周波数を変調信号によってステップ状に変化させるので、基準信号は、ＰＬＬ１１を構成するループフィルタ７の時定数及びＰＬＬ１１のループゲイン等に影響されることなく高速に周波数変化するので、従来よりも周波数の過渡応答性に優れている。また、基準信号は、水晶振動子発振用ＩＣ１で生成されるのでＱ値が極めて高い信号なので、本多周波送信器Ａによれば、発振信号（送信信号）の周波数安定性が高い。   According to the present multi-frequency transmitter A, the frequency of the reference signal is changed stepwise by the modulation signal, so that the reference signal is affected by the time constant of the loop filter 7 constituting the PLL 11, the loop gain of the PLL 11, and the like. Since the frequency changes at a high speed, the transient response of the frequency is superior to the conventional one. Further, since the reference signal is generated by the crystal oscillator oscillation IC 1 and is a signal having an extremely high Q value, according to the present multi-frequency transmitter A, the frequency stability of the oscillation signal (transmission signal) is high.

なお、本発明は、上記実施形態に限定されるものではなく、例えば以下のような変形例が考えられる。
（１）上記実施形態では、水晶振動子発振用ＩＣ１で生成される基準信号を変調信号でステップ状に周波数変化させるが、上述したように水晶振動子発振用ＩＣ１で生成される基準信号のＱ値は極めて高いので、基準信号の周波数変化幅は自ずと小さなものである。すなわち、発振信号（送信信号）の周波数変化幅も自ずと小さなものとなる。したがって、発振信号（送信信号）の周波数変化幅を比較的大きくとるためには、水晶振動子の中でも比較的Ｑ値の小さなものを選定する必要がある。 In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the frequency of the reference signal generated by the crystal oscillator oscillation IC 1 is changed stepwise by the modulation signal, but as described above, the Q of the reference signal generated by the crystal oscillator oscillation IC 1 Since the value is extremely high, the frequency change width of the reference signal is naturally small. That is, the frequency change width of the oscillation signal (transmission signal) is naturally small. Therefore, in order to make the frequency change width of the oscillation signal (transmission signal) relatively large, it is necessary to select a crystal resonator having a relatively small Q value.

（２）上記実施形態では、３つのコンデンサ２〜４を外付け部品として使用するタイプの水晶振動子発振用ＩＣ１を用いたが、本発明はこれに限定されない。より少ない外付けコンデンサを使用するタイプの水晶振動子発振用ＩＣを採用してもよい。 (2) In the above embodiment, the crystal oscillator oscillation IC 1 of the type using the three capacitors 2 to 4 as external components is used, but the present invention is not limited to this. A type of crystal oscillator IC that uses fewer external capacitors may be used.

１…水晶振動子発振用ＩＣ、２〜４…コンデンサ、５…変調信号発生器、６…位相比較器、７…ループフィルタ、８…ＶＣＯ（電圧制御発振器：Voltage Controled Oscilator）、９…分周器、１０…送信アンテナ、１１…ＰＬＬ、１２…基準信号発生器   DESCRIPTION OF SYMBOLS 1 ... IC for crystal oscillator oscillation, 2-4 ... capacitor | condenser, 5 ... modulation signal generator, 6 ... phase comparator, 7 ... loop filter, 8 ... VCO (Voltage Controlled Oscilator), 9 ... frequency division 10 ... Transmission antenna 11 ... PLL 12 ... Reference signal generator

Claims (3)

水晶振動子を少なくとも備え、変調信号発生器から入力された変調信号によって水晶振動子の発振周波数を調整する基準信号発生器と、
位相比較器、ループフィルタ及び電圧制御発振器を少なくとも備え、基準信号発生器の出力と電圧制御発振器の出力とを位相比較器で位相比較するＰＬＬと
を具備することを特徴とする多周波発振器。 A reference signal generator that includes at least a crystal resonator and adjusts the oscillation frequency of the crystal resonator by a modulation signal input from the modulation signal generator;
A multi-frequency oscillator comprising at least a phase comparator, a loop filter, and a voltage controlled oscillator, and comprising a PLL for phase comparison of the output of the reference signal generator and the output of the voltage controlled oscillator by the phase comparator. 電圧制御発振器と位相比較器との間に分周期を備えることを特徴とする請求項１記載の多周波発振器。   2. The multi-frequency oscillator according to claim 1, further comprising a dividing period between the voltage controlled oscillator and the phase comparator. 請求項１または２記載の多周波発振器と、
電圧制御発振器の出力に接続された送信アンテナと
を具備することを特徴とするの多周波送信器。 The multi-frequency oscillator according to claim 1 or 2,
A multi-frequency transmitter comprising: a transmitting antenna connected to an output of the voltage controlled oscillator.
JP2011059347A 2011-03-17 2011-03-17 Multi-frequency oscillator Pending JP2012195833A (en)

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JPH06120735A (en) * 1992-10-08 1994-04-28 Yokogawa Denshi Kiki Kk Oscillation circuit
JPH06334519A (en) * 1993-05-24 1994-12-02 Fujitsu Ltd Phase locked loop
JP2004229045A (en) * 2003-01-24 2004-08-12 Kokusai Denki Engineering:Kk Oscillation frequency correction circuit in mobile radio device
JP2006258709A (en) * 2005-03-18 2006-09-28 Yokogawa Denshikiki Co Ltd Radar device
JP2006332915A (en) * 2005-05-24 2006-12-07 Yokogawa Electric Corp Phase locked loop, signal generator, and synchronizing method
JP2008224491A (en) * 2007-03-14 2008-09-25 Sumitomo Electric Ind Ltd Electric wave beacon and monitoring method of its carrier frequency
WO2009028214A1 (en) * 2007-08-30 2009-03-05 Olympus Medical Systems Corp. Capsule type medical device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208005A (en) * 1988-02-15 1989-08-22 Fujitsu Ltd Frequency modulation circuit
JPH06120735A (en) * 1992-10-08 1994-04-28 Yokogawa Denshi Kiki Kk Oscillation circuit
JPH06334519A (en) * 1993-05-24 1994-12-02 Fujitsu Ltd Phase locked loop
JP2004229045A (en) * 2003-01-24 2004-08-12 Kokusai Denki Engineering:Kk Oscillation frequency correction circuit in mobile radio device
JP2006258709A (en) * 2005-03-18 2006-09-28 Yokogawa Denshikiki Co Ltd Radar device
JP2006332915A (en) * 2005-05-24 2006-12-07 Yokogawa Electric Corp Phase locked loop, signal generator, and synchronizing method
JP2008224491A (en) * 2007-03-14 2008-09-25 Sumitomo Electric Ind Ltd Electric wave beacon and monitoring method of its carrier frequency
WO2009028214A1 (en) * 2007-08-30 2009-03-05 Olympus Medical Systems Corp. Capsule type medical device

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