JP2000013225A - Oscillator - Google Patents
OscillatorInfo
- Publication number
- JP2000013225A JP2000013225A JP10177175A JP17717598A JP2000013225A JP 2000013225 A JP2000013225 A JP 2000013225A JP 10177175 A JP10177175 A JP 10177175A JP 17717598 A JP17717598 A JP 17717598A JP 2000013225 A JP2000013225 A JP 2000013225A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- voltage
- oscillator
- mhz
- oscillation
- 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
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Transceivers (AREA)
- Superheterodyne Receivers (AREA)
- Transmitters (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、発振器に係り、特
に詳しくは、例えば無線機に用いられる局部発振器等の
発振器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator, and more particularly to an oscillator such as a local oscillator used for a radio.
【０００２】[0002]
【従来の技術】従来の局部発振器の一例を図２に示す。
図２に示すように、無線機内の局部発振器１は、位相同
期ループ回路２によって、ローパスフィルタ３、電圧制
御発振回路４、バッファアンプ５を閉回路にて、基準周
波数７の周波数てい倍回路となるように発振周波数を安
定制御している。2. Description of the Related Art FIG. 2 shows an example of a conventional local oscillator.
As shown in FIG. 2, the local oscillator 1 in the wireless device includes a low-pass filter 3, a voltage-controlled oscillation circuit 4, and a buffer amplifier 5 in a closed circuit by a phase-locked loop circuit 2, and a frequency multiplication circuit of a reference frequency 7. The oscillation frequency is stably controlled so as to be as follows.
【０００３】[0003]
【発明が解決しようとする課題】前記局部発振器１で発
振する周波数の可変範囲は、電圧制御発振回路４内の水
晶振動子やセラミック振動子、ＬＣ発振回路による可変
動作範囲となるため、仮にその発振周波数の１０％が動
作範囲とすると、発振周波数が低周波ほど可変範囲がと
りにくい傾向がある。そのため、可変範囲を広くする場
合には、電圧制御発振回路４をＡバンド、Ｂバンド、Ｃ
バンドというように周波数帯域ごとにわけ、必要に応じ
て切り替え器６等で切り替えるか、局部発振回路１自体
を切り替える必要があった。Since the variable range of the frequency oscillated by the local oscillator 1 is the variable operation range of the crystal oscillator, the ceramic oscillator, and the LC oscillation circuit in the voltage controlled oscillation circuit 4, it is assumed that the range is variable. When the operating range is 10% of the oscillation frequency, the lower the oscillation frequency, the more difficult it is to obtain a variable range. Therefore, in order to widen the variable range, the voltage-controlled oscillation circuit 4 is set to the A band, the B band, and the C band.
It is necessary to divide each frequency band such as a band, and to switch with the switch 6 or the like or to switch the local oscillation circuit 1 itself as necessary.
【０００４】[0004]
【課題を解決するための手段】本発明では、上記の課題
を解決するため、電圧制御発振回路で発振する周波数を
目的の低周波の周波数ではなく、一度高周波にして可変
範囲を広帯域化した後、周波数変換器にて低周波に変換
することで、発振器を広帯域で使用できる様にしたもの
である。その結果、低周波においても、電圧制御発振回
路を切り替えることなく、発振器を広帯域で使用するこ
とが可能となる。According to the present invention, in order to solve the above-mentioned problems, the frequency oscillated by the voltage-controlled oscillation circuit is not changed to the target low frequency but is increased once to broaden the variable range. By converting the frequency to a low frequency by a frequency converter, the oscillator can be used in a wide band. As a result, even at a low frequency, the oscillator can be used in a wide band without switching the voltage controlled oscillation circuit.
【０００５】[0005]
【発明の実施の形態】以下、本発明の一実施例を図１を
参照して説明する。本実施例では、無線機に用いられる
局部発振器を例にして説明する。図１において、局部発
振器１内の電圧制御発振器４及び４′で発振する周波数
は、広帯域化が比較的容易な高周波でかつ、２つの周波
数を周波数変換器８で組み合わせると、目的の周波数と
なるように構成されている。例えば、目的の周波数が３
０ＭＨｚならば、電圧制御発振器４は１５０ＭＨｚ電圧
制御発振器４′は１２０ＭＨｚとして、周波数変換器８
で１５０−１２０＝３０ＭＨｚを発生するようにする。
この時の電圧制御発振回路内の振動子は、１５０ＭＨｚ
と３０ＭＨｚの場合を比べると、振動子に対する可変動
作範囲が１０％と仮定すると、それぞれ１５ＭＨｚ、３
ＭＨｚになり、動作可変幅の差は１２ＭＨｚとなる。そ
の結果、局部発振器１における可変範囲が１０ＭＨｚを
必要とするならば、従来では１つのバンドで３ＭＨｚし
か可変幅がないため、図２の如く３バンド構成とする必
要があったが、本実施例においては、可変幅が１５ＭＨ
ｚであるため、切り替え回路を通す必要もなく、広帯域
化を行うことが可能となる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. In the present embodiment, a local oscillator used in a wireless device will be described as an example. In FIG. 1, the frequency oscillated by the voltage controlled oscillators 4 and 4 'in the local oscillator 1 is a high frequency which is relatively easy to widen, and becomes the target frequency when the two frequencies are combined by the frequency converter 8. It is configured as follows. For example, if the target frequency is 3
If 0 MHz, the voltage controlled oscillator 4 is set to 150 MHz and the voltage controlled oscillator 4 'is set to 120 MHz, and the frequency converter 8
To generate 150-120 = 30 MHz.
The vibrator in the voltage controlled oscillation circuit at this time is 150 MHz
And 30 MHz, assuming that the variable operation range for the vibrator is 10%, 15 MHz and 3 MHz, respectively.
MHz, and the difference in the operation variable width is 12 MHz. As a result, if the variable range of the local oscillator 1 requires 10 MHz, a three-band configuration is required as shown in FIG. Has a variable width of 15 MH
Since it is z, it is possible to widen the band without passing through a switching circuit.
【０００６】[0006]
【発明の効果】本発明によれば、低周波においても、電
圧制御発振回路を切り替えることなく、発振周波数の可
変範囲を広くすることができ、発振器を広帯域で使用す
ることが可能となる。According to the present invention, even at a low frequency, the variable range of the oscillation frequency can be widened without switching the voltage controlled oscillation circuit, and the oscillator can be used in a wide band.
【図１】本発明による局部発振器の一実施例の構成を示
すブロック図。FIG. 1 is a block diagram showing a configuration of an embodiment of a local oscillator according to the present invention.
【図２】従来の局部発振器の構成例を示すブロック図。FIG. 2 is a block diagram showing a configuration example of a conventional local oscillator.
１：局部発振器、 ２：位相同期ルー
プ回路、３：ローパスフィルタ、 ４：電圧
制御発振回路、５：バッファアンプ、
６：切り替え器、７：基準周波数、
８：周波数変換器。1: local oscillator, 2: phase locked loop circuit, 3: low-pass filter, 4: voltage-controlled oscillation circuit, 5: buffer amplifier,
6: switch, 7: reference frequency,
8: Frequency converter.
Claims (2)
路を有する発振器において、 上記電圧制御発振器の発振周波数を所要の周波数よりも
高く設定して上記位相同期ループ回路を形成し、該電圧
制御発振器の発振出力を周波数変換して所要の周波数信
号を得るように構成したことを特徴とする発振器。1. An oscillator having a phase-locked loop circuit including a voltage-controlled oscillator, wherein the oscillation frequency of the voltage-controlled oscillator is set higher than a required frequency to form the phase-locked loop circuit. An oscillator characterized in that an oscillation output is frequency-converted to obtain a required frequency signal.
線機。2. A radio comprising the oscillator according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10177175A JP2000013225A (en) | 1998-06-24 | 1998-06-24 | Oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10177175A JP2000013225A (en) | 1998-06-24 | 1998-06-24 | Oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000013225A true JP2000013225A (en) | 2000-01-14 |
Family
ID=16026502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10177175A Pending JP2000013225A (en) | 1998-06-24 | 1998-06-24 | Oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000013225A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008123769A (en) * | 2006-11-10 | 2008-05-29 | Hitachi Vehicle Energy Ltd | Battery pack packing structure |
-
1998
- 1998-06-24 JP JP10177175A patent/JP2000013225A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008123769A (en) * | 2006-11-10 | 2008-05-29 | Hitachi Vehicle Energy Ltd | Battery pack packing structure |
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