JPS60261220A - Synthesizer oscillator - Google Patents

Synthesizer oscillator

Info

Publication number
JPS60261220A
JPS60261220A JP59117562A JP11756284A JPS60261220A JP S60261220 A JPS60261220 A JP S60261220A JP 59117562 A JP59117562 A JP 59117562A JP 11756284 A JP11756284 A JP 11756284A JP S60261220 A JPS60261220 A JP S60261220A
Authority
JP
Japan
Prior art keywords
frequency
output
oscillator
synthesizer
oscillators
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
Application number
JP59117562A
Other languages
Japanese (ja)
Inventor
Tadashi Takeda
正 竹田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59117562A priority Critical patent/JPS60261220A/en
Publication of JPS60261220A publication Critical patent/JPS60261220A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00Automatic control of frequency or phase; Synchronisation
    • H03L7/06Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To realize a high resolution by a response of a high speed, and to realize a wide frequency variation width by providing the first and the second PLL synthesizer oscillators, an arithmetic unit, and a mixer for synthesizing output of both the oscillators. CONSTITUTION:An output of an arithmetic unit 16 is inputted to prorammable dividers 10, 15, respectively, of the firsr and the second synthesizer oscillators A, B of a synthesizer oscillator, and a variable frequency dividing ratio of the oscillators A, B is controlled. An output frequency f1 being a reference frequency fs is generated from this oscillator A, and an output frequency f2 being a difference (fs-fa) of the reference frequency and a necessary resolution frequency fa is oscillated from the oscillator B. Said both the frequencies f1, f2 are inputted to a mixer 17, and a frequency f0=f1-f2 is outputted. Subsequently, 1/(I+K+N) and 1/(J+N) by zero or positive integers I, J, K and N are added to the dividers 10, 15, respectively, from the unit 16, they are set to a range of conditions of I.fsJ.(fs-fa), K>=0, and 0<=N<fs/fa, and a resolution of a high speed and a wide frequency variation width are realized.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、A M受信機の局部発振回路あるいは計測用
標準侶も発生器の信も発生回路等に用いられるシンセサ
イザ発振器に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a synthesizer oscillator used in a local oscillation circuit of an AM receiver, a measurement standard, a generator circuit, and the like.

従来例の構成とその問題点 従来のPLLシンセサイザ発振器について第1図を用い
て説明する。第1図において、(1)は基準信号発生器
、(2)は位相比較器、(3)は低域フィルタ、(4)
は電圧制御発振器(以下「VCO」と称す)、(5)は
プログラマブルデイバイダである。この回路は、VCO
(4)の出力をプログラマブルデイバイダ(5)でN分
周(Nは任意の正の整数)を行なった出8力と基準信号
発生器(1)の出力fretとを位相比較器(2ンによ
り位相比較し、その出力を低域フィルタ(3)を通して
V CO(4)に供給することにより、入力信号の位相
に追随する位相同期回路を構成している。こうして閉回
路中のV CO(4)の周波数f。が常にヂrefのN
倍となる様に動作している。
Configuration of a conventional example and its problems A conventional PLL synthesizer oscillator will be explained with reference to FIG. In Figure 1, (1) is a reference signal generator, (2) is a phase comparator, (3) is a low-pass filter, (4)
is a voltage controlled oscillator (hereinafter referred to as "VCO"), and (5) is a programmable divider. This circuit is a VCO
(4) is divided by N (N is any positive integer) using the programmable divider (5), and the output fret of the reference signal generator (1) is connected to the phase comparator (2 By comparing the phases of the V CO ( 4) Frequency f. is always N of diref
It is working double.

したがって、周波数の分解能はfrefによって決定さ
れる。分解能を上げるためにfrefを小さくすると、
ロックアツプタイムも遅くなり、周波数掃引を行うとき
その掃引速度を速く出来ない欠−スをI KHzに設定
したときの局部発振器として使用した場合、可聴周波帯
にシンセサイザが存在することになり、S/’Hの劣化
が生ずる等の欠点を有している。
Therefore, the frequency resolution is determined by fref. If you reduce fref to increase resolution,
The lock-up time will also be slow, and if you use it as a local oscillator when the frequency sweep is set to I KHz, there will be a synthesizer in the audio frequency band. It has drawbacks such as deterioration of /'H.

発明の目的 本発明は上記従来の欠点を解消するもので、高分解能と
速いロックアツプタイムとを得ることのできるシンセサ
イザ発振器を提供することを目的とする。
OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional art, and an object of the present invention is to provide a synthesizer oscillator that can obtain high resolution and fast lock-up time.

発明の構成 上記目的を達成するため、本発明のシンセサイザ発振器
は、基準周波数がf8でかつ出力周波数が+、の第1の
PLLシンセサイザ発振器と、基準周波数が前記fsと
必要分解能周波数faとの差Cf8−チa)でかつ出力
周波数がチ2の第2のPLLシンセサイザ発振器と、こ
れら第1及び第2のPLLシンセサイザ発振器の可変分
局比を制御するための第1及び第2の出力を発生する演
算装置と、前記第1及び第2のPLLシンセサイザ発振
器の差出力f。を得る混合器とを備え、Is J−に、
Nを零または正の整数とし、前記f0を前記f8のに倍
と前記チ、のN倍との和f。二に−f8十N−faで表
わしたとき、K、Nを前記演算装置に入力して、前記第
1の出力としてCI十に十N)を、また前記第2の出力
として(J十N)を得ることにより、 1 ・ f8 二 J −(f、−チa)K2O の成立条件の範囲において、任意の周波数を分解能周波
数チ2で得る構成としたものである。
Structure of the Invention In order to achieve the above object, the synthesizer oscillator of the present invention includes a first PLL synthesizer oscillator whose reference frequency is f8 and whose output frequency is +, and whose reference frequency is the difference between the fs and the required resolution frequency fa. generates a second PLL synthesizer oscillator of Cf8-chia) and an output frequency of chi2, and first and second outputs for controlling variable division ratios of the first and second PLL synthesizer oscillators; a difference output f between the arithmetic unit and the first and second PLL synthesizer oscillators; and a mixer to obtain Is J-,
N is zero or a positive integer, and f0 is the sum of f0 times f8 and N times f. When expressed as -f80N-fa, K and N are input to the arithmetic unit, and the first output is CI00N, and the second output is (J0N). ), it is possible to obtain an arbitrary frequency with a resolution frequency of 2 within the range of the conditions for the following.

実施例の説明 以下、本発明の一実施例について、図面に基づいて説明
する。
DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

第2図は本発明の一実施例におけるシンセサイザ発振器
の回路ブロック図で、(A)は基準信号発生器(6ンと
位相比較器(7)と低域フィルタ(8)とVCO(9)
とプログラマブルデイバイダ04とによって構成されて
出力周波数flを得る第1のPLLシンセサイザ発振器
、(B)は基準信号発生器αηと位相比較器斡と低域フ
ィルタ(6)と■COα樽とプログラマブルデイバイダ
(ハ)とによって構成されて出力周波数f2を得る第2
0PLLシンセサイザ発振器、(lfjは演算装置、(
転)は混合器であり、シンセサイザ発振器の出力f。は
flとチ。とを混合器αηに入力し、混合器αηに含ま
れるローパスフィルタによって(fI−チ2)aを取り
出すことによって得られる。
FIG. 2 is a circuit block diagram of a synthesizer oscillator in one embodiment of the present invention, in which (A) shows a reference signal generator (6), a phase comparator (7), a low-pass filter (8), and a VCO (9).
and a programmable divider 04 to obtain an output frequency fl; (B) is a reference signal generator αη, a phase comparator □, a low-pass filter (6), a COα barrel, and a programmable divider 04; and a second filter to obtain the output frequency f2.
0PLL synthesizer oscillator, (lfj is the arithmetic unit, (
is a mixer, and the output f of the synthesizer oscillator. is fl and chi. is input to the mixer αη, and (fI−CH2)a is extracted by a low-pass filter included in the mixer αη.

ここで、必要周波数foi = 999 KHz〜f0
2−20.001M田、分解能IK田でかつ基準周波数
100にルの場合について具体的に説明する。上記構成
から明らかな様に、成立条件は 1、J、に、Nは零または正の整数 ■ ・九 二J (f8−チa) K≧す 0≦ゝくf・/f8 となっている。また 基準周波数 f5= 100 K庫 分解能周波数 fa= I K庫 必要周波数 、fo1= 999 KHz必要周波数 
fa2= 20.001 M庫と与えられている。fo
lの場合 fot二Kt・fs十N11’、= 9X100KHz
+〇9XIKHz”、に1”” 9 e N1−99 とKとNとの値が与えられた時、演算装置(IQの第1
の出力端には(I+に十N)が出力され、第1のPLL
シンセサイザ発振器(A)のプログラマブルデイバイダ
(IQのデータとして供給され、出力周波数f1−fs
・(I 十に十N )となる。この時演算装置軸の第2
の出力端には(J十N)が出力され、第2のPLLシン
セサイザ発振器CB)のプログラマブルデイバイダ(至
)のデータとして供給され、出力周波数f2−(J+N
)・(+8−九)が出力される。
Here, the required frequency foi = 999 KHz ~ f0
2-2 A case where the resolution is IK and the reference frequency is 100 will be specifically explained. As is clear from the above structure, the conditions are 1, J, and N is zero or a positive integer. . Also, reference frequency f5 = 100 K warehouse resolution frequency fa = I K warehouse required frequency, fo1 = 999 KHz required frequency
It is given that fa2=20.001 M storage. fo
In the case of l, fot2Kt・fs10N11', = 9X100KHz
+〇9
(10N to I+) is output to the output terminal of the first PLL.
Programmable divider of synthesizer oscillator (A) (supplied as IQ data, output frequency f1-fs
・(I ten to ten N). At this time, the second axis of the arithmetic unit
(J + N) is output to the output terminal of , which is supplied as data to the programmable divider (to) of the second PLL synthesizer oscillator CB), and the output frequency f2-(J + N
)・(+8-9) is output.

この時J、Iは、必要周波数fatと必要周波数fo2
と−の変、化範囲をカバーするためのV CO(9) 
<14の変化範囲を規定するための定数である。ここで
仮にi −f 8==J H<fs−fa)をfsと(
fs−fa)との最小公倍数の3倍と規定すると、与え
られた条件から ムニ1oo Ki 、+8− fa= 99 KH2、
“、最小公倍数 9900 したがって 9900X8=I−、f、 J(+8−fa)から 1 = 297 J = 300 となる。従って f1□=へ・(I十に、十Nよ)=’100X(297
+9+99)=40500 K田 同様に f =(J+N)(f −f ) = (800+99
)X(100−215B 1) = 89501 K服 から f(H−fl(+2.= 40500 89501 =
 999 KHzとめられ、これは必要周波数f01=
 999 KHzがめられたことになる。
At this time, J and I are the required frequency fat and the required frequency fo2
V CO (9) to cover the range of changes and changes in and -
<14 is a constant for defining a range of change. Here, suppose i −f 8==J H<fs−fa) as fs and (
fs-fa), then from the given conditions Muni 1oo Ki, +8-fa=99 KH2,
", least common multiple 9900 Therefore, 9900X8=I-, f, J (+8-fa), 1 = 297 J = 300. Therefore, f1□=to (I ten, ten N) = '100X (297
+9+99)=40500 Similarly to Kada, f = (J+N)(f - f) = (800+99
)
999 KHz, which is the required frequency f01=
This means that 999 KHz was detected.

同様に、+02の場合 チ。2−に2・+8+N2・チa= 200 X100
 KHz+IXIKHz、’、K2二200. N=1 51=fs ・(I 十に2 十N2 ) =100 
X (297+200 +1) = 49800 KH
z ヂ22 =(J 十N2) ・(+5−ヂa )=(8
00+1)・(1001) = 29799 KHz より −l’o2= +12− +22 = 49800−2
9799 = 20001 KHzとめられ、これは必
要周波数チox = 20.001 Ml−1zがめら
れたことになる。
Similarly, in the case of +02. 2- to 2・+8+N2・Chia= 200 X100
KHz+IXIKHz,', K22200. N=1 51=fs ・(I 10 to 2 10 N2) = 100
X (297+200 +1) = 49800 KH
z 22 = (J 1N2) ・(+5-dia) = (8
00+1)・(1001) = 29799 KHz -l'o2= +12- +22 = 49800-2
9799 = 20001 KHz, which means that the required frequency Chiox = 20.001 Ml-1z was determined.

ここで第10PLLシンセサイザ発振器(A)の出力周
波数変化、+1.−+、□は40500 Kル〜498
00hであり、VCOを実現出来る値となっている。又
第20PLLシンセサイザ発振器(B)の出力周波数変
化チ21〜f22は89501 K)4z 〜2979
9 KHzであり、VCOを充分実現出来る値となって
おり、I、Jの値が不適当でないことが判る。このよう
に、任意の必要周波数foを、分解能周波数6でかつ略
第1の基準周波数:1:5のロックアツプタイムで実現
することが可能となるのである。
Here, the output frequency change of the 10th PLL synthesizer oscillator (A) is +1. -+, □ is 40500K le ~ 498
00h, which is a value that can realize a VCO. Also, the output frequency change of the 20th PLL synthesizer oscillator (B) is 89501K)4z~2979
9 KHz, which is a value that can sufficiently realize a VCO, and it can be seen that the values of I and J are not inappropriate. In this way, it is possible to realize an arbitrary required frequency fo with a resolution frequency of 6 and a lockup time of approximately 1:5 of the first reference frequency.

発明の詳細 な説明した様に本発明のシンセサイザ発振器は、高速の
応答で高い分解能を実現できると同時に、広い周波数変
化幅を実現することができ゛る。
As described in detail, the synthesizer oscillator of the present invention can achieve high resolution with high-speed response, and at the same time can realize a wide frequency variation range.

したがって、シンセサイザによる計測用標準信号発生器
の信号発生回路にも使用出来、またAM受信器に使用す
れば、PLL回路の基準周波数を可聴周波帯域例に設定
しながら数十爾の微調整を可能とするファインチューニ
ング機能をシンセサイザで実現でき、さらには、第1の
基準周波数と第2の基準周波数とを水晶発振子によって
作成するようにすれば、温度による周波数漂動が極端に
小さくなることは、同一素材素子の漂動特性が打ち消し
合うことからも明白である。
Therefore, it can be used in the signal generation circuit of a standard signal generator for measurement using a synthesizer, and if used in an AM receiver, it is possible to make dozens of fine adjustments while setting the reference frequency of the PLL circuit to the audio frequency band example. If the fine tuning function can be realized using a synthesizer, and if the first reference frequency and the second reference frequency are created using a crystal oscillator, frequency drift due to temperature will be extremely small. , it is clear from the fact that the drifting characteristics of elements made of the same material cancel each other out.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は従来のPLLシンセサイザ発振器の回路ブロッ
ク図、第2図は本発明の一実施例におけるシンセサイザ
発振器の回路ブロック図である。 (6)αυ・・・基準信号発生器、(7)(2)・・・
位相比較器、(8)G・・・低域フィルタ、(9劃脣・
・・VCO,Q(J(+5・・・プログラマブルデイバ
イダ、(A)・・・第10PLLシンセサイザ発振器、
(B)・・第20PLLシンセサイザ発振器 代理人 森本義弘
FIG. 1 is a circuit block diagram of a conventional PLL synthesizer oscillator, and FIG. 2 is a circuit block diagram of a synthesizer oscillator according to an embodiment of the present invention. (6) αυ... Reference signal generator, (7) (2)...
Phase comparator, (8) G...low-pass filter, (9 section/
...VCO, Q(J(+5...Programmable divider, (A)...10th PLL synthesizer oscillator,
(B)...20th PLL synthesizer oscillator representative Yoshihiro Morimoto

Claims (1)

【特許請求の範囲】 1、基準周波数がf5でかつ出方周波数がチ1の第1O
PLLシンセサイザ発振器と、基準周波数が前記チ。と
必要分解能周波数fa との差(f5−ヂa)でかつ出
方周波数がf2の第2のPLLシンセサイザ発振器と、
これら第1及び第2のPLLシンセサイザ発振器の可変
分局比を制御するための第1及び第2の出力を発生ずる
演算装置と、前記第1及び第20P、LLシンセサイザ
発&器の差出力チ。を得る混合器とを備え、I、J、に
、Nを零または正の整数とし、前記f、を前記f のK
倍と前記f−3のN倍との和 f。−に−ヂ、十N−f
aで表わしたとき、K、Nを前記演算装置に入力して、
前記第1の出力とじて(I十に十N)を、また前記第2
の出力として(J十N)を得ることにより、■ ・、+
5二J ・ (fs−チa)K2O 8 0:qN<7− 、+3 @成立条件の範囲において、任意の周波数を分解能周波
数faで得る構成としたシンセサイザ発振器。
[Claims] 1. The first O whose reference frequency is f5 and whose output frequency is chi1
PLL synthesizer oscillator and the reference frequency is the same as above. and a second PLL synthesizer oscillator whose output frequency is f2 and which is the difference (f5-dia) between the required resolution frequency fa and the required resolution frequency fa;
an arithmetic unit that generates first and second outputs for controlling variable division ratios of the first and second PLL synthesizer oscillators; and a differential output circuit of the first and 20th P and LL synthesizer oscillators. , where I, J, N is zero or a positive integer, and the f is the K of the f
The sum of f and N times the f-3. -ni-di, ten N-f
When expressed as a, input K and N to the arithmetic device,
The first output (I ten ten N), and the second output
By obtaining (J + N) as the output of ■ ・, +
A synthesizer oscillator configured to obtain an arbitrary frequency at a resolution frequency fa within the range of 52J.
JP59117562A 1984-06-07 1984-06-07 Synthesizer oscillator Pending JPS60261220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59117562A JPS60261220A (en) 1984-06-07 1984-06-07 Synthesizer oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59117562A JPS60261220A (en) 1984-06-07 1984-06-07 Synthesizer oscillator

Publications (1)

Publication Number Publication Date
JPS60261220A true JPS60261220A (en) 1985-12-24

Family

ID=14714883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59117562A Pending JPS60261220A (en) 1984-06-07 1984-06-07 Synthesizer oscillator

Country Status (1)

Country Link
JP (1) JPS60261220A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664618A1 (en) * 1992-06-08 1995-07-26 Nec Corporation Local oscillation frequency synthesizer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0664618A1 (en) * 1992-06-08 1995-07-26 Nec Corporation Local oscillation frequency synthesizer

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