JPH08139525A - Voltage-controlled saw oscillator - Google Patents
Voltage-controlled saw oscillatorInfo
- Publication number
- JPH08139525A JPH08139525A JP27755994A JP27755994A JPH08139525A JP H08139525 A JPH08139525 A JP H08139525A JP 27755994 A JP27755994 A JP 27755994A JP 27755994 A JP27755994 A JP 27755994A JP H08139525 A JPH08139525 A JP H08139525A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- oscillation
- circuit
- saw
- variable
- 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.)
- Granted
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、発振素子としてＳＡ
Ｗレゾネータ（弾性表面波素子）を用いた電圧制御型Ｓ
ＡＷ発振器に関するものである。This invention relates to an SA as an oscillation element.
Voltage control type S using W resonator (surface acoustic wave element)
The present invention relates to an AW oscillator.
【０００２】[0002]
【従来の技術】ＶＨＦ帯の各種信号を得るために、ＶＨ
Ｆ帯のＶＣＯ（電圧制御型発振器）およびＰＬＬ回路
（位相ロックループ回路）がよく利用されている。この
場合、発振周波数帯域が低周波の場合には、ＶＣＯとし
て水晶振動子を利用した周波数安定度の良好なＶＣＸＯ
が利用されている。発振周波数帯域が高周波の場合に
は、水晶振動子が利用できないため、ＬＣ発振器が通常
頻繁に利用されている。2. Description of the Related Art In order to obtain various signals in the VHF band, VH
An FCO VCO (voltage controlled oscillator) and a PLL circuit (phase locked loop circuit) are often used. In this case, when the oscillation frequency band is low, a VCXO that uses a crystal oscillator as a VCO and has good frequency stability is used.
Is used. When the oscillation frequency band is high, the crystal oscillator cannot be used, and therefore the LC oscillator is usually frequently used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ＬＣ発
振器は周波数可変範囲が広く良好であるが、周波数安定
度（Ｃ／Ｎ）が悪く、ジッタを発生させる。このため、
低ジッタが要求されるディジタル伝送系装置では、使用
することが困難であった。なお、外部につけたＰＬＬ回
路により、低周波成分のジッタは抑圧されるが、高周波
成分のジッタ（いわゆるキャリア周波数の近傍±１ｋHz
以上の成分）は、簡単なＰＬＬ回路では抑圧が困難であ
る。However, although the LC oscillator has a wide frequency variable range and is good, it has poor frequency stability (C / N) and causes jitter. For this reason,
It has been difficult to use in a digital transmission system device that requires low jitter. A low-frequency component jitter is suppressed by an external PLL circuit, but high-frequency component jitter (so-called carrier frequency ± 1 kHz
The above components) are difficult to suppress with a simple PLL circuit.
【０００４】本発明はこのような課題を解決するために
なされたもので、その目的とするところは、周波数可変
範囲が広く、かつ周波数安定度の良い電圧制御型ＳＡＷ
発振器を提供することにある。The present invention has been made to solve the above problems, and an object of the present invention is to provide a voltage controlled SAW having a wide frequency variable range and good frequency stability.
It is to provide an oscillator.
【０００５】[0005]
【課題を解決するための手段】このような目的を達成す
るために、第１発明（請求項１に係る発明）は、第１の
ＳＡＷレゾネータを発振素子とし周波数ｆ１の発振出力
を出力する周波数固定型発振回路と、第２のＳＡＷレゾ
ネータを発振素子とし周波数ｆ２の発振出力を出力する
周波数可変型発振回路とを設け、周波数固定型発振回路
および周波数可変型発振回路の出力を周波数変換回路へ
与え、この周波数変換回路の出力から差周波数成分「ｆ
２−ｆ１」を抽出するようにしたものである。In order to achieve such an object, a first invention (an invention according to claim 1) is a frequency for outputting an oscillation output of frequency f1 using a first SAW resonator as an oscillating element. A fixed oscillation circuit and a variable frequency oscillation circuit that outputs an oscillation output of frequency f2 using the second SAW resonator as an oscillation element are provided, and the outputs of the fixed frequency oscillation circuit and the variable frequency oscillation circuit are sent to the frequency conversion circuit. And output the difference frequency component "f from the output of this frequency conversion circuit.
2-f1 "is extracted.
【０００６】第２発明（請求項２に係る発明）は、第１
のＳＡＷレゾネータおよび第２のＳＡＷレゾネータを同
一のパッケージに内蔵し、第１のＳＡＷレゾネータを発
振素子とし周波数ｆ１の発振出力を出力する周波数固定
型発振回路と、第２のＳＡＷレゾネータを発振素子とし
周波数ｆ２の発振出力を出力する周波数可変型発振回路
とを設け、周波数固定型発振回路および周波数可変型発
振回路の出力を周波数変換回路へ与え、この周波数変換
回路の出力から差周波数成分「ｆ２−ｆ１」を抽出する
ようにしたものである。第３発明（請求項３に係る発
明）は、第１発明又は第２発明において、周波数可変型
発振回路の発振出力の周波数ｆ２を、可変容量ダイオー
ドの静電容量の変化により変化させるようにしたもので
ある。[0006] The second invention (the invention according to claim 2) is the first invention.
The SAW resonator and the second SAW resonator are built in the same package, the first SAW resonator is the oscillation element, and the fixed frequency oscillation circuit that outputs the oscillation output of frequency f1 is used, and the second SAW resonator is the oscillation element. A frequency variable oscillation circuit that outputs an oscillation output of frequency f2 is provided, the outputs of the fixed frequency oscillation circuit and the frequency variable oscillation circuit are supplied to the frequency conversion circuit, and the difference frequency component "f2- f1 "is extracted. In a third invention (an invention according to claim 3), in the first invention or the second invention, the frequency f2 of the oscillation output of the variable frequency oscillation circuit is changed by a change in the electrostatic capacitance of the variable capacitance diode. It is a thing.
【０００７】[0007]
【作用】したがってこの発明によれば、第１発明では、
第１および第２のＳＡＷレゾネータを発振素子とする周
波数固定型発振回路および周波数可変型発振回路から周
波数ｆ１およびｆ２の発振出力が出力され、これらの発
振出力が周波数変換回路へ与えられ、差周波数成分「ｆ
２−ｆ１」が抽出される。第２発明では、同一のパッケ
ージに内蔵された第１および第２のＳＡＷレゾネータを
発振素子とする周波数固定型発振回路および周波数可変
型発振回路から周波数ｆ１およびｆ２の発振出力が出力
され、これらの発振出力が周波数変換回路へ与えられ、
差周波数成分「ｆ２−ｆ１」が抽出される。第３発明で
は、第１発明又は第２発明において、可変容量ダイオー
ドの静電容量を変化させることにより、周波数可変型発
振回路の発振出力の周波数ｆ２が変化する。Therefore, according to the present invention, in the first invention,
Oscillation outputs of frequencies f1 and f2 are output from the fixed frequency oscillation circuit and the variable frequency oscillation circuit using the first and second SAW resonators as oscillation elements, and these oscillation outputs are given to the frequency conversion circuit to obtain the difference frequency. Ingredient "f
2-f1 "is extracted. In the second invention, the fixed frequency oscillation circuit and the frequency variable oscillation circuit having the first and second SAW resonators as the oscillation elements, which are built in the same package, output oscillation outputs of frequencies f1 and f2. The oscillation output is given to the frequency conversion circuit,
The difference frequency component "f2-f1" is extracted. In the third invention, in the first invention or the second invention, the frequency f2 of the oscillation output of the variable frequency oscillation circuit is changed by changing the capacitance of the variable capacitance diode.
【０００８】[0008]
【実施例】以下、本発明を実施例に基づき詳細に説明す
る。図１はこの発明の一実施例を示す電圧制御型ＳＡＷ
発振器のブロック図である。同図において、１はＳＡＷ
レゾネータ２および３を同一のパッケージに内蔵（封
入）した一体型ＳＡＷレゾネータ、４はＳＡＷレゾネー
タ２を発振素子とし周波数ｆ１の発振出力を出力する２
端子型の周波数固定型ＳＡＷ発振回路、５はＳＡＷレゾ
ネータ３を発振素子とし周波数ｆ２の発振出力を出力す
る２端子型の周波数可変型（電圧可変型）ＳＡＷ発振回
路、６は周波数固定型ＳＡＷ発振回路４および周波数可
変型ＳＡＷ発振回路５の出力を入力とし入力周波数（ｆ
１，ｆ２）同士の和と差の結合成分信号を出力する周波
数変換回路、７はこの周波数変換回路６の出力する結合
成分信号から差周波数成分「ｆ２−ｆ１」を抽出する低
域濾波器である。EXAMPLES The present invention will now be described in detail based on examples. FIG. 1 is a voltage control type SAW showing an embodiment of the present invention.
It is a block diagram of an oscillator. In the figure, 1 is a SAW
An integrated SAW resonator in which the resonators 2 and 3 are built in (enclosed) in the same package, and 4 uses the SAW resonator 2 as an oscillating element and outputs an oscillation output of frequency f1.
Terminal type fixed frequency SAW oscillator circuit, 5 is a two terminal type variable frequency (voltage variable) SAW oscillator circuit that uses the SAW resonator 3 as an oscillating element and outputs an oscillation output of frequency f2, and 6 is a fixed frequency SAW oscillator The output of the circuit 4 and the variable frequency SAW oscillator circuit 5 is used as an input and the input frequency (f
1, f2) is a frequency conversion circuit that outputs a combined component signal of the sum and difference between them, and 7 is a low-pass filter that extracts the difference frequency component "f2-f1" from the combined component signal output by the frequency conversion circuit 6. is there.
【０００９】この電圧制御型ＳＡＷ発振器において、周
波数可変型ＳＡＷ発振回路５の出力する発振出力の周波
数ｆ２は、制御入力端子８より与えられる制御電圧の変
化に従い変化する。このため、出力周波数として出力端
子９より出力される差周波数成分「ｆ２−ｆ１」も、制
御電圧の変化に応じて変化することになる。ＳＡＷレゾ
ネータ２を発振素子とする周波数固定型ＳＡＷ発振回路
４およびＳＡＷレゾネータ３を発振素子とする周波数可
変型ＳＡＷ発振回路５は、その周波数安定度がＬＣ発振
器に比して良好であり、水晶発振回路にほゞ匹敵する周
波数安定度で周波数ｆ１およびｆ２の発振出力を出力す
る。In this voltage control type SAW oscillator, the frequency f2 of the oscillation output output from the frequency variable type SAW oscillation circuit 5 changes according to the change of the control voltage applied from the control input terminal 8. Therefore, the difference frequency component “f2-f1” output from the output terminal 9 as the output frequency also changes according to the change in the control voltage. The fixed frequency SAW oscillator circuit 4 using the SAW resonator 2 as an oscillating element and the variable frequency SAW oscillator circuit 5 using the SAW resonator 3 as an oscillating element have better frequency stability than the LC oscillator, and crystal oscillation. The oscillation outputs of frequencies f1 and f2 are output with a frequency stability almost equal to that of the circuit.
【００１０】このため、出力端子９より出力される差周
波数成分「ｆ２−ｆ１」の周波数安定度も良好となり、
低ジッタの出力周波数が得られる。また、ｆ２に対する
周波数可変幅が、ｆ１により周波数変換されているた
め、「ｆ２−ｆ１」の周波数帯でみると、相対可変範囲
が広くとれる。また、出力周波数を差周波数成分「ｆ２
−ｆ１」として得ることにより、すなわち「差演算」を
行うことにより、周波数固定型ＳＡＷ発振回路４および
周波数可変型ＳＡＷ発振回路５の出力に生ずる変動分が
キャンセルされる。また、ＳＡＷレゾネータ２および３
を同一のパッケージに封じ込めているので、温度条件や
経時条件が等しくなり、温度変動や経時変動に対して
も、差周波数成分「ｆ２−ｆ１」の周波数安定度が良好
となる。Therefore, the frequency stability of the difference frequency component "f2-f1" output from the output terminal 9 also becomes good,
An output frequency with low jitter can be obtained. Further, since the frequency variable width for f2 is frequency-converted by f1, the relative variable range can be widened in the frequency band of “f2-f1”. In addition, the output frequency is set to the difference frequency component “f2
By obtaining "-f1", that is, by performing the "difference calculation", the fluctuation amount generated in the outputs of the fixed frequency SAW oscillation circuit 4 and the variable frequency SAW oscillation circuit 5 is canceled. Also, SAW resonators 2 and 3
Are contained in the same package, the temperature conditions and the aging conditions are the same, and the frequency stability of the difference frequency component “f2-f1” is good even with respect to the temperature variation and the aging variation.
【００１１】図２に周波数固定型ＳＡＷ発振回路４の構
成例を示す。本回路はＳＡＷレゾネータ２を発振素子と
し、ＳＡＷレゾネータ２とコンデンサ１７，１８を主発
振回路としたコルピッツ型発振回路を構成している。抵
抗器１２，１４，１５は直流バイアス印加用、コンデン
サ１９は高周波バイパス用として用いられる。また、コ
ンデンサ１６は交流カップリング用として、抵抗器１１
は帰還量の調整に用いられる。抵抗器１３は負荷抵抗で
あり、周波数ｆ１の発振出力は出力端子２０より出力さ
れる。なお、２６はＮＰＮトランジスタ、２１は電源端
子である。FIG. 2 shows a configuration example of the fixed frequency SAW oscillator circuit 4. This circuit constitutes a Colpitts type oscillation circuit in which the SAW resonator 2 is an oscillating element and the SAW resonator 2 and the capacitors 17 and 18 are main oscillation circuits. The resistors 12, 14 and 15 are used for applying a DC bias, and the capacitor 19 is used for high frequency bypass. Further, the capacitor 16 is used for AC coupling, and the resistor 11 is used.
Is used to adjust the amount of feedback. The resistor 13 is a load resistor, and the oscillation output of the frequency f1 is output from the output terminal 20. Incidentally, 26 is an NPN transistor, and 21 is a power supply terminal.
【００１２】図３に周波数可変型ＳＡＷ発振回路５の構
成例を示す。本回路はＳＡＷレゾネータ３を発振素子と
し、ＳＡＷレゾネータ３とコンデンサ１７，１８および
可変容量ダイオード２５を主発振回路としたコルピッツ
型発振回路を構成している。抵抗器１２，１４，１５は
直流バイアス印加用、コンデンサ１９は高周波バイパス
用として用いられる。また、コンデンサ１６は交流カッ
プリング用として、抵抗器１１は帰還量の調整に用いら
れる。抵抗器１３は負荷抵抗であり、周波数ｆ２の発振
出力は出力端子２２より出力される。なお、２６はＮＰ
Ｎトランジスタ、２１は電源端子である。FIG. 3 shows a configuration example of the variable frequency SAW oscillator circuit 5. This circuit constitutes a Colpitts type oscillating circuit in which the SAW resonator 3 is an oscillating element, and the SAW resonator 3, the capacitors 17, 18 and the variable capacitance diode 25 are main oscillating circuits. The resistors 12, 14 and 15 are used for applying a DC bias, and the capacitor 19 is used for high frequency bypass. The capacitor 16 is used for AC coupling, and the resistor 11 is used for adjusting the feedback amount. The resistor 13 is a load resistor, and the oscillation output of the frequency f2 is output from the output terminal 22. In addition, 26 is NP
N transistor, 21 is a power supply terminal.
【００１３】この周波数可変型ＳＡＷ発振回路５では、
ＳＡＷレゾネータ３と直列に接続された可変容量ダイオ
ード２５により周波数ｆ２を変化させる。すなわち、抵
抗器２３，２４により印加される直流電圧に応じて可変
容量ダイオード２５の静電量容量を変化させ、発振出力
の周波数ｆ２を変化させる。なお、本実施例では、ＳＡ
Ｗレゾネータ２および３を同一のパッケージに内蔵する
ものとしたが、必ずしも同一のパッケージに内蔵しなく
てもよい。In this variable frequency SAW oscillator circuit 5,
The variable frequency diode 25 connected in series with the SAW resonator 3 changes the frequency f2. That is, the capacitance of the variable capacitance diode 25 is changed according to the DC voltage applied by the resistors 23 and 24, and the frequency f2 of the oscillation output is changed. In this embodiment, SA
Although the W resonators 2 and 3 are built in the same package, they do not necessarily have to be built in the same package.
【００１４】[0014]
【発明の効果】以上説明したことから明らかなように本
発明によれば、第１発明では、周波数固定型発振回路お
よび周波数可変型発振回路から水晶発振回路にほゞ匹敵
する周波数安定度で周波数ｆ１およびｆ２の発振出力が
出力されるため、差周波数成分「ｆ２−ｆ１」の周波数
安定度も良好となり、低ジッタの出力周波数を得ること
ができるようになる。また、ｆ２に対する周波数可変幅
が、ｆ１により周波数変換されているため、「ｆ２−ｆ
１」の周波数帯でみると、相対可変範囲が広くとれる。As is apparent from the above description, according to the present invention, in the first invention, the frequency fixed type oscillation circuit and the variable frequency type oscillation circuit are operated at the frequency stability almost equal to that of the crystal oscillation circuit. Since the oscillating outputs of f1 and f2 are output, the frequency stability of the difference frequency component “f2-f1” also becomes good, and an output frequency with low jitter can be obtained. Further, since the frequency variable width for f2 is frequency-converted by f1, “f2-f
In the frequency band of "1", the relative variable range can be widened.
【００１５】第２発明では、周波数固定型発振回路およ
び周波数可変型発振回路から水晶発振回路にほゞ匹敵す
る周波数安定度で周波数ｆ１およびｆ２の発振出力が出
力されるため、差周波数成分「ｆ２−ｆ１」の周波数安
定度も良好となり、低ジッタの出力周波数を得ることが
できるようになる。また、第１および第２のＳＡＷレゾ
ネータが同一のパッケージに内蔵されているため、温度
条件や経時条件が等しくなり、温度変動や経時変動に対
しても、差周波数成分「ｆ２−ｆ１」の周波数安定度が
良好となる。また、ｆ２に対する周波数可変幅が、ｆ１
により周波数変換されているため、「ｆ２−ｆ１」の周
波数帯でみると、相対可変範囲が広くとれる。第３発明
では、第１発明又は第２発明において、可変容量ダイオ
ードの静電容量を変化させることにより、周波数可変型
発振回路の発振出力の周波数ｆ２が変化し、上述した第
１発明又は第２発明の効果に加えて、簡単な構成で周波
数可変型発振回路を構成することができるという効果を
奏する。In the second aspect of the invention, since the oscillation output of the frequencies f1 and f2 is output from the fixed frequency type oscillation circuit and the variable frequency type oscillation circuit with the frequency stability almost equal to that of the crystal oscillation circuit, the difference frequency component "f2" is output. The frequency stability of "-f1" is also improved, and an output frequency with low jitter can be obtained. In addition, since the first and second SAW resonators are built in the same package, the temperature conditions and the aging conditions are the same, and the frequency of the difference frequency component "f2-f1" is not affected by the temperature variation and the aging variation. Good stability. Further, the frequency variable width for f2 is f1
Since the frequency is converted by, the relative variable range can be widened in the frequency band "f2-f1". In a third invention, in the first invention or the second invention, the frequency f2 of the oscillation output of the frequency variable oscillation circuit is changed by changing the electrostatic capacitance of the variable capacitance diode, and the first invention or the second invention described above. In addition to the effect of the invention, the frequency variable oscillation circuit can be configured with a simple structure.
【図１】 本発明の一実施例を示す電圧制御型ＳＡＷ発
振器のブロック図である。FIG. 1 is a block diagram of a voltage-controlled SAW oscillator showing an embodiment of the present invention.
【図２】 この電圧制御型ＳＡＷ発振器に用いられる周
波数固定型ＳＡＷ発振回路の構成例を示す図である。FIG. 2 is a diagram showing a configuration example of a fixed frequency SAW oscillator circuit used in this voltage controlled SAW oscillator.
【図３】 この電圧制御型ＳＡＷ発振器に用いられる周
波数可変型ＳＡＷ発振回路の構成例を示す図である。FIG. 3 is a diagram showing a configuration example of a frequency variable SAW oscillator circuit used in this voltage controlled SAW oscillator.
１…一体型ＳＡＷレゾネータ、２，３…ＳＡＷレゾネー
タ、４…周波数固定型ＳＡＷ発振回路、５…周波数可変
型ＳＡＷ発振回路、６…周波数変換回路、７…低域濾波
器、８…制御入力端子、９…出力端子。DESCRIPTION OF SYMBOLS 1 ... Integrated SAW resonator, 2, 3 ... SAW resonator, 4 ... Frequency fixed type SAW oscillation circuit, 5 ... Frequency variable type SAW oscillation circuit, 6 ... Frequency conversion circuit, 7 ... Low-pass filter, 8 ... Control input terminal , 9 ... Output terminals.
Claims (3)
周波数ｆ１の発振出力を出力する周波数固定型発振回路
と、 第２のＳＡＷレゾネータを発振素子とし周波数ｆ２の発
振出力を出力する周波数可変型発振回路と、 前記周波数固定型発振回路および前記周波数可変型発振
回路の出力を入力とする周波数変換回路と、 この周波数変換回路の出力から差周波数成分「ｆ２−ｆ
１」を抽出する差周波数成分抽出回路とを備えたことを
特徴とする電圧制御型ＳＡＷ発振器。1. A fixed frequency oscillation circuit that uses a first SAW resonator as an oscillating element and outputs an oscillation output of frequency f1, and a variable frequency oscillation circuit that uses a second SAW resonator as an oscillation element and outputs an oscillation output of frequency f2. A circuit, a frequency conversion circuit whose inputs are outputs of the fixed frequency oscillation circuit and the variable frequency oscillation circuit, and a difference frequency component "f2-f" from the output of the frequency conversion circuit.
And a difference frequency component extracting circuit for extracting 1 ”.
ＡＷレゾネータを同一のパッケージに内蔵した一体型Ｓ
ＡＷレゾネータと、 前記第１のＳＡＷレゾネータを発振素子とし周波数ｆ１
の発振出力を出力する周波数固定型発振回路と、 前記第２のＳＡＷレゾネータを発振素子とし周波数ｆ２
の発振出力を出力する周波数可変型発振回路と、 前記周波数固定型発振回路および前記周波数可変型発振
回路の出力を入力とする周波数変換回路と、 この周波数変換回路の出力から差周波数成分「ｆ２−ｆ
１」を抽出する差周波数成分抽出回路とを備えたことを
特徴とする電圧制御型ＳＡＷ発振器。2. A first SAW resonator and a second SW.
Integrated S with AW resonator built in the same package
An AW resonator, and a frequency f1 using the first SAW resonator as an oscillating element
Fixed frequency type oscillation circuit for outputting the oscillation output of, and a frequency f2 using the second SAW resonator as an oscillation element.
A variable frequency oscillation circuit that outputs the oscillation output of, a frequency conversion circuit that receives the outputs of the fixed frequency oscillation circuit and the variable frequency oscillation circuit as an input, and a difference frequency component "f2- f
And a difference frequency component extracting circuit for extracting 1 ”.
可変型発振回路は、可変容量ダイオードの静電容量の変
化により発振出力の周波数ｆ２が変化することを特徴と
する電圧制御型ＳＡＷ発振器。3. The voltage-controlled SAW oscillator according to claim 1 or 2, wherein the variable frequency oscillator circuit changes the oscillation output frequency f2 due to a change in the capacitance of the variable capacitance diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6277559A JP2897661B2 (en) | 1994-11-11 | 1994-11-11 | Voltage controlled SAW oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6277559A JP2897661B2 (en) | 1994-11-11 | 1994-11-11 | Voltage controlled SAW oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08139525A true JPH08139525A (en) | 1996-05-31 |
| JP2897661B2 JP2897661B2 (en) | 1999-05-31 |
Family
ID=17585215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6277559A Expired - Fee Related JP2897661B2 (en) | 1994-11-11 | 1994-11-11 | Voltage controlled SAW oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2897661B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100447743B1 (en) * | 2002-02-27 | 2004-09-08 | (주)쎄트렉아이 | Voltage-Controlled Oscilator having a plurality of Resonators |
| US6842077B2 (en) | 1999-10-27 | 2005-01-11 | Nec Corporation | Voltage controlled oscillator for use in a phase locked loop |
| WO2005098846A1 (en) * | 2004-04-08 | 2005-10-20 | Pioneer Corporation | Information reproducing device for ferroelectric recording medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS537111A (en) * | 1976-07-09 | 1978-01-23 | Nec Corp | Frequency converter |
| JPS5573105A (en) * | 1978-11-27 | 1980-06-02 | Toshiba Corp | Elastic surface wave oscillator |
| JPS5972804A (en) * | 1982-10-20 | 1984-04-24 | Matsushita Electric Ind Co Ltd | Surface acoustic wave element |
| JPH02292904A (en) * | 1989-05-08 | 1990-12-04 | Murata Mfg Co Ltd | Voltage controlled surface acoustic wave oscillator |
| JPH06104688A (en) * | 1992-09-21 | 1994-04-15 | Clarion Co Ltd | Surface acoustic wave element |
-
1994
- 1994-11-11 JP JP6277559A patent/JP2897661B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS537111A (en) * | 1976-07-09 | 1978-01-23 | Nec Corp | Frequency converter |
| JPS5573105A (en) * | 1978-11-27 | 1980-06-02 | Toshiba Corp | Elastic surface wave oscillator |
| JPS5972804A (en) * | 1982-10-20 | 1984-04-24 | Matsushita Electric Ind Co Ltd | Surface acoustic wave element |
| JPH02292904A (en) * | 1989-05-08 | 1990-12-04 | Murata Mfg Co Ltd | Voltage controlled surface acoustic wave oscillator |
| JPH06104688A (en) * | 1992-09-21 | 1994-04-15 | Clarion Co Ltd | Surface acoustic wave element |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6842077B2 (en) | 1999-10-27 | 2005-01-11 | Nec Corporation | Voltage controlled oscillator for use in a phase locked loop |
| KR100447743B1 (en) * | 2002-02-27 | 2004-09-08 | (주)쎄트렉아이 | Voltage-Controlled Oscilator having a plurality of Resonators |
| WO2005098846A1 (en) * | 2004-04-08 | 2005-10-20 | Pioneer Corporation | Information reproducing device for ferroelectric recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2897661B2 (en) | 1999-05-31 |
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