JPH0370923B2 - - Google Patents
Info
- Publication number
- JPH0370923B2 JPH0370923B2 JP59193129A JP19312984A JPH0370923B2 JP H0370923 B2 JPH0370923 B2 JP H0370923B2 JP 59193129 A JP59193129 A JP 59193129A JP 19312984 A JP19312984 A JP 19312984A JP H0370923 B2 JPH0370923 B2 JP H0370923B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- output
- controlled oscillator
- voltage controlled
- frequency divider
- 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.)
- Expired - Lifetime
Links
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
【発明の詳細な説明】
（発明の属する技術分野）
本発明はPLLを用いた変調器、さらに詳しく
云えば、周波数の安定度、変調特性の良好性およ
び製造の容易性を考慮した変調器に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a modulator using a PLL, and more specifically, to a modulator that takes into consideration frequency stability, good modulation characteristics, and ease of manufacture. .
（従来の技術）
PLL方式を使用した変調器には(1)基準発振器
に直接変調をかける、(2)電圧制御発振器に直接変
調をかける、等の構成が従来より採用されてい
る。(Prior Art) Modulators using the PLL system have conventionally adopted configurations such as (1) applying direct modulation to a reference oscillator, and (2) applying direct modulation to a voltage controlled oscillator.
しかしながら前者の構成では基準発振器自体に
変調がかかるため、基準発振器の安定度を向上さ
せるのは困難となり、高価になる。後者の構成で
は変調器出力の周波数帯域が広い場合は出力周波
数帯域内での変調度のバラツキが出易く、変調周
波数が低い場合は位相比較器と変調器間に入れる
ローパスフイルタの帯域を低くしなければなら
ず、不安定となる。 However, in the former configuration, since the reference oscillator itself is modulated, it is difficult to improve the stability of the reference oscillator and it becomes expensive. In the latter configuration, if the frequency band of the modulator output is wide, variations in the modulation degree within the output frequency band tend to occur, and if the modulation frequency is low, the band of the low-pass filter inserted between the phase comparator and the modulator should be lowered. Otherwise, it becomes unstable.
（発明の目的）
本発明は上記欠点を解決するもので、その目的
は周波数安定度が高く、さらに変調に対しても安
定のある変調器を提供することにある。(Objective of the Invention) The present invention solves the above-mentioned drawbacks, and its object is to provide a modulator that has high frequency stability and is also stable against modulation.
（発明の構成）
前記目的を達成するために本発明による変調器
は基準発振器と、前記基準発振器の発振出力を分
周する第１の分周器と、前記第１の分周器の出力
に接続された可変位相器と、前記可変位相器の出
力を分周する第２の分周器と、電圧制御発振器
と、前記電圧制御発振器の出力を分周する第３の
分周器と、前記第２と第３の分周器の出力を位相
を比較する位相検波器と、前記位相検波器の出力
の不要波を除去し、それを前記電圧制御発振器の
制御入力に接続するローパスフイルタとを含み、
２つの分周器の間に挿入された前記可変位相器の
位相を変えることによつて前記電圧制御発振器に
間接的に変調をかけるように構成してある。(Structure of the Invention) In order to achieve the above object, a modulator according to the present invention includes a reference oscillator, a first frequency divider that divides the oscillation output of the reference oscillator, and an output of the first frequency divider. a connected variable phase shifter, a second frequency divider that frequency divides the output of the variable phase shifter, a voltage controlled oscillator, a third frequency divider that frequency divides the output of the voltage controlled oscillator; a phase detector that compares the phases of the outputs of the second and third frequency dividers; and a low-pass filter that removes unnecessary waves from the output of the phase detector and connects it to the control input of the voltage controlled oscillator. including,
The voltage controlled oscillator is indirectly modulated by changing the phase of the variable phase shifter inserted between two frequency dividers.
前記構成によれば本発明の目的は完全に達成さ
れる。 According to the above configuration, the object of the present invention is completely achieved.
（実施例）
以下、図面を参照して本発明をさらに詳しく説
明する。第１図は本発明による変調器の実施例を
示す回路ブロツク図である。図において、１は基
準発振器、２は分周器、３は可変位相器、４は分
周器、５は位相比較器、６は分周器、７は電圧制
御発振器、８はローパスフイルタをそれぞれ示し
ている。基準発振器の発振周波数f1は分周器２に
よつて１／n1分周され、周波数f1／n1の出力が可
変位相器３に入力される。周波数f1／n1は可変位
相器３で変調入力によつて位相変調を受けた後、
分周器４によつて、さらに分周され、f1／n1n2と
なつて位相比較器５の一方の入力端子に加えられ
る。位相比較器５はローパスフイルタ８、電圧制
御発振器７および分周器６とともにPLLループ
を形成しており、電圧制御発振器７の発振出力周
波数f2が分周されてf2／ｍの周波数が他方の入力
端子に加えられる。位相比較器５の出力は（f1／
n1n2〜f2／ｍ）の周波数差および位相差に応じた
電圧となり、電圧制御発振器に帰還される。(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a circuit block diagram showing an embodiment of a modulator according to the present invention. In the figure, 1 is a reference oscillator, 2 is a frequency divider, 3 is a variable phase shifter, 4 is a frequency divider, 5 is a phase comparator, 6 is a frequency divider, 7 is a voltage controlled oscillator, and 8 is a low-pass filter. It shows. The oscillation frequency f 1 of the reference oscillator is divided by 1/ n1 by the frequency divider 2, and the output of the frequency f 1 /n 1 is input to the variable phase shifter 3. After the frequency f 1 /n 1 undergoes phase modulation by the modulation input in the variable phase shifter 3,
The frequency is further divided by the frequency divider 4 to become f 1 /n 1 n 2 and applied to one input terminal of the phase comparator 5. The phase comparator 5 forms a PLL loop together with the low-pass filter 8, the voltage-controlled oscillator 7, and the frequency divider 6, and the oscillation output frequency f 2 of the voltage-controlled oscillator 7 is divided so that the frequency of f 2 /m becomes the other frequency. is applied to the input terminal of The output of the phase comparator 5 is (f 1 /
A voltage corresponding to the frequency difference and phase difference (n 1 n 2 to f 2 /m) is generated and fed back to the voltage controlled oscillator.
このように変調波は端子１０より入力して可変
位相器３で位相変調し、PLLループによつて電
圧制御発振器７に間接的に変調がかけられる。 In this way, the modulated wave is input from the terminal 10, phase-modulated by the variable phase shifter 3, and indirectly modulated by the voltage-controlled oscillator 7 by the PLL loop.
変調を基準発振器１や電圧制御発振器７に直接
かけないため、基準発振器は高安定で安価な発振
器が作れ、さらに電圧制御発振器は広帯域にして
も変調がPLLループでかかるため変調端子を必
要とせず、作成が容易である。 Since modulation is not applied directly to the reference oscillator 1 or the voltage controlled oscillator 7, a highly stable and inexpensive oscillator can be made as the reference oscillator, and even if the voltage controlled oscillator is wideband, modulation is applied in the PLL loop, so no modulation terminal is required. , easy to create.
さらに可変位相器は基準発振周波数と位相検波
器の周波数の間の周波数を任意に選択できるた
め、多数種類の安定で安価な変調器を作成でき
る。 Furthermore, since the variable phase shifter can arbitrarily select a frequency between the reference oscillation frequency and the frequency of the phase detector, many types of stable and inexpensive modulators can be created.
（発明の効果）
本発明による変調器は以上、詳しくは説明した
ように、基準発振器出力の分周波に位相変調を与
え、PLLループによつて電圧制御発振器に間接
的に変調をかけ、基準発振器および電圧制御発振
器に直接に変調をかけない構成であるので、周波
数安定度が高く、変調特性が良好であり、さらに
高安定な両発振器を安価に、容易に作成できる利
点がある。(Effects of the Invention) As explained above in detail, the modulator according to the present invention applies phase modulation to the frequency-divided wave of the reference oscillator output, indirectly modulates the voltage controlled oscillator by the PLL loop, and Since the configuration does not directly modulate the voltage controlled oscillator, it has high frequency stability and good modulation characteristics, and has the advantage that both highly stable oscillators can be easily produced at low cost.
第１図は本発明による変調器の実施例を示す回
路ブロツク図である。
１……基準発振器、２，４，６……分周器、３
……可変位相器、５……位相比較器、７……電圧
制御発振器、８……ローパスフイルタ、９……変
調出力、１０……変調入力端子。
FIG. 1 is a circuit block diagram showing an embodiment of a modulator according to the present invention. 1... Reference oscillator, 2, 4, 6... Frequency divider, 3
... variable phase shifter, 5 ... phase comparator, 7 ... voltage controlled oscillator, 8 ... low pass filter, 9 ... modulation output, 10 ... modulation input terminal.
Claims (1)
分周する第１の分周器と、前記第１の分周器の出
力に接続された可変位相器と、前記可変位相器の
出力を分周する第２の分周器と、電圧制御発振器
と、前記電圧制御発振器の出力を分周する第３の
分周器と、前記第２と第３の分周器の出力の位相
を比較する位相検波器と、前記位相検波器の出力
の不要波を除去し、それを前記電圧制御発振器の
制御入力に接続するローパスフイルタとを含み、
２つの分周器の間に挿入された前記可変位相器の
位相を変えることによつて前記電圧制御発振器に
間接的に変調をかけるように構成した変調器。1 a reference oscillator, a first frequency divider that divides the oscillation output of the reference oscillator, a variable phase shifter connected to the output of the first frequency divider, and a frequency divider that divides the output of the variable phase shifter. a second frequency divider that divides the output of the voltage controlled oscillator; a third frequency divider that divides the output of the voltage controlled oscillator; and a phase that compares the phases of the outputs of the second and third frequency dividers. a wave detector; and a low-pass filter that removes unnecessary waves from the output of the phase detector and connects it to a control input of the voltage controlled oscillator;
A modulator configured to indirectly modulate the voltage controlled oscillator by changing the phase of the variable phase shifter inserted between two frequency dividers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19312984A JPS6171706A (en) | 1984-09-14 | 1984-09-14 | Modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19312984A JPS6171706A (en) | 1984-09-14 | 1984-09-14 | Modulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6171706A JPS6171706A (en) | 1986-04-12 |
| JPH0370923B2 true JPH0370923B2 (en) | 1991-11-11 |
Family
ID=16302747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19312984A Granted JPS6171706A (en) | 1984-09-14 | 1984-09-14 | Modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6171706A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5295956A (en) * | 1976-02-09 | 1977-08-12 | Toyo Communication Equip | Phase synchronized frequency synthesizer containing modulator |
| JPS5341054B2 (en) * | 1974-06-21 | 1978-10-31 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341054U (en) * | 1976-09-13 | 1978-04-10 |
-
1984
- 1984-09-14 JP JP19312984A patent/JPS6171706A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5341054B2 (en) * | 1974-06-21 | 1978-10-31 | ||
| JPS5295956A (en) * | 1976-02-09 | 1977-08-12 | Toyo Communication Equip | Phase synchronized frequency synthesizer containing modulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6171706A (en) | 1986-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |