JPS6079832A - Frequency tuning circuit - Google Patents

Frequency tuning circuit

Info

Publication number
JPS6079832A
JPS6079832A JP18817883A JP18817883A JPS6079832A JP S6079832 A JPS6079832 A JP S6079832A JP 18817883 A JP18817883 A JP 18817883A JP 18817883 A JP18817883 A JP 18817883A JP S6079832 A JPS6079832 A JP S6079832A
Authority
JP
Japan
Prior art keywords
frequency
oscillator
fif1
output
synthesizer
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
JP18817883A
Other languages
Japanese (ja)
Inventor
Yoshio Hamada
浜田　芳男
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP18817883A priority Critical patent/JPS6079832A/en
Publication of JPS6079832A publication Critical patent/JPS6079832A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0272—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being used to preset a counter or a frequency divider in a phase locked loop, e.g. frequency synthesizer

Abstract

PURPOSE:To improve the frequency tuning accuracy by controlling an output frequency of a frequency synthesizer according to an oscillated frequency of a fixed oscillator. CONSTITUTION:The frequency synthesizer SYN2 consists of a PLL circuit comprising a VCO2a, a loop filter 2b, a phase comparator 2c, a reference frequency oscillator 2d, a frequency converter 2e and a variable frequency divider 2f. An input signal of frequency fR is mixed (3) with a frequency fL1 of the SYN2 by a frequency converter 3, converted into a frequency fIF1 and becomes fIF1=fL1- fR through a BPF4. The frequency becomes fL1=fL2+Nf1 and fIF1=fL2+Nf1- fR, where N is a frequency dividing ratio of frequency divider 2f and f1, fL2 are oscillating frequencies of the oscillator 2d and the fixed oscillator 6 respectively. The fIF1 is mixed with an output signal of the oscillator 6 by the frequency converter 5, converted into the fIP2 and becomes fIF2=fL2-fIF1=fR-Nf1. The frequency tuning is attained by changing the value of the frequency dividing ratio N in response to the input signal frequency fR and the output stability of an output signal is not affected by the frequency fluctuation of the oscillator 6.

Description

【発明の詳細な説明】 〔発明の技術分野］ この発明は周波数シンセサイザを用いた周波数同調回路
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a frequency tuning circuit using a frequency synthesizer.

［従来技術］ 従来この種の回路として第１図に示すものかあつた。図
において、（１）は信号入力端子、（２）は周波数シン
セサイザ〜、（３）、（５）　ｔ／ｉ周波数変換器、（
４）は帯域制御フィルタ、（６）は固定発振器、（７）
は信号出力端子である。[Prior Art] A conventional circuit of this type is shown in FIG. In the figure, (1) is a signal input terminal, (2) is a frequency synthesizer ~, (3), (5) is a t/i frequency converter, (
4) is a band control filter, (6) is a fixed oscillator, (7)
is a signal output terminal.

次に動作について説明する。信号入力端子（１）から入
力したＲＦ信＠−（ｆｎ）は同波数変換器（３）によっ
て周波数シンセサイザー（２）の出力信号ＣｆＬ１）　
トミキシングされｆＴＦｌに変換される。変換された信
号を帯ｖｃ制限フィルタ（４）を通すこ七により、不用
波を１余失し必要信号のみ取シ出す。Next, the operation will be explained. The RF signal @-(fn) input from the signal input terminal (1) is converted to the output signal CfL1) of the frequency synthesizer (2) by the same wave number converter (3).
It is tomixed and converted to fTFl. By passing the converted signal through a band VC limiting filter (4), more than one unnecessary wave is lost and only the necessary signal is extracted.

ｆ　Ｔｒｉ　＝ｆＬｔ　−ｆＲ（ｆＬｌ）ｆＲの場合）
さらにこのｆｌＦｌは周波数変換器（５）によって、固
定発振器（６）の出力信！’（ｆＲ２）とミキシングさ
れｆｌＦ２に変換される。f Tri = fLt - fR (fLl) fR)
Furthermore, this flFl is converted into the output signal of the fixed oscillator (6) by the frequency converter (5)! '(fR2) and converted to flF2.

ｆｒｖ２＝ｆＬ２−ｆＩｖｌ、　（ｆｒ、ｚ）：ｒｒＦ
ｌ）ｆＴＦ２＝ｆＬ２−（ｆＬｌ−ｆｎ） ｆＬｌを変化させることにより、任意の入力信号（ｆＲ
）に対して出力（ｆ■Ｆ２）を一定の同波数に同調する
ことができる。frv2=fL2-fIvl, (fr,z):rrF
l) fTF2=fL2-(fLl-fn) By changing fLl, any input signal (fR
), it is possible to tune the output (f■F2) to a constant same wave number.

従来の回路は以上のように構成されているので、出力周
波数（ｆｒｐ２）の同調周波数確度はｆＬｌ及びｆｔ２
によって決まる為同波数シンセサイザ（２）、固定発振
器（６）共、確度の高いものが必要であった。Since the conventional circuit is configured as described above, the tuning frequency accuracy of the output frequency (frp2) is fLl and ft2.
Therefore, both the same wave number synthesizer (2) and the fixed oscillator (6) needed to be highly accurate.

〔発明の概要〕[Summary of the invention]

この発明は上記のような従来のものの欠点を除去するた
めになされたもので、同波数シンセサイザの出力周波数
を固定発振器の発振周波数に応じて制御することにより
、同波数同調確度を向上させることができる同波数同調
回路を提供することを目的としている。This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it is possible to improve the same wave number tuning accuracy by controlling the output frequency of the same wave number synthesizer according to the oscillation frequency of a fixed oscillator. The purpose of this research is to provide a same wave number tuning circuit that can perform the same wave number tuning.

Ｃ発明の実施例〕 以下この発明の一実施例を図について説明する。Example of invention C] An embodiment of the present invention will be described below with reference to the drawings.

第２図において（２ａ）〜（２ｆ）は周波数シンセサイ
ザ（２）の構成ブロックで（２ａ）は入力電圧により発
振周波数が変化するｖｃｏ、（２ｂ）はＶ　ＣＯ（２ａ
）を制御するループフィルタ、（２ａ）０２位相比較器
、（２ｄ）／／ｉ基準発振器、（２ｅ）はＶ　ＣＯ（２
ａ）の出力を変換する周波数変換器、（２ｆ）は入力同
波数をＩＡ分周する可変分局器である。In Figure 2, (2a) to (2f) are the constituent blocks of the frequency synthesizer (2), (2a) is a VCO whose oscillation frequency changes depending on the input voltage, and (2b) is a VCO (2a).
), (2a) 02 phase comparator, (2d) //i reference oscillator, (2e) V CO (2
A) is a frequency converter that converts the output, and (2f) is a variable divider that divides the input same wave number by IA.

次に動作について説明する。Next, the operation will be explained.

信号入力端子（１）から入力したＲＦ倍信号ｎｔ）は周
波数変換器（３）Ｋよって周波数シンセサイザ（２）の
出力信号（ｆＬｔ　）とミキシングされ（ｆｌＦｘ）に
変換されフィルタ（４）を通すことにより ｆＴＦｚ＝ｆＬ１−ｆＲ となることは従来の動作説明で述べた通りである。The RF multiplied signal nt) input from the signal input terminal (1) is mixed with the output signal (fLt) of the frequency synthesizer (2) by the frequency converter (3) K, converted to (flFx), and passed through the filter (4). As described in the conventional operation description, fTFz=fL1-fR.

ここで同波数シンセサイザ（２）の出力周波数（ｆＬｌ
）は同波数変換器（２ｅ）可変分間器（２ｆ）を用いた
場合は ｆＬ１＝ｆＬ２＋Ｎ　−’ｆｌ となることは周知の通りである。Here, the output frequency (fLl) of the same wave number synthesizer (2)
) is known to be fL1=fL2+N-'fl when the same wave number converter (2e) and variable separator (2f) are used.

従がってｉ”ＴＦｌは ｆｒｐｌ＝ｆｔ、２−１−Ｎ−ｆｔ　−ｆＲに変換され
る。Therefore, i''TFl is converted to frpl=ft, 2-1-N-ft-fR.

ｆＩＦ２＝ｆＬ２−ｆＩＦｌ ＝ｆＲ−Ｎ−ｆｌ となり、入力信号周波数ｆＨに応じて可変分局器（２ｆ
）の分周比Ｎの値を変えることにより同波数同調を行な
うことができる。fIF2=fL2-fIFl=fR-N-fl, and the variable splitter (2f
) can perform the same wave number tuning by changing the value of the frequency division ratio N.

なお、上記実施例では、周波数シンセサイザ（２）に周
波数変換器（２ｅ）を設け、この同波変換機能によシそ
の出力周波数ｆＬ１を制御するようにしたが、固定発振
器（６）の発振間波戒に応じて可変分間器（２ｆ）ある
いは新たに可変分局器を設けられた可変分間器の分局比
を制御するようにしても同様の効果を奏する。In the above embodiment, the frequency converter (2e) is provided in the frequency synthesizer (2), and the output frequency fL1 is controlled by this same wave conversion function. The same effect can be achieved by controlling the division ratio of the variable splitter (2f) or a variable splitter newly provided with a variable splitter depending on the wave conditions.

〔発明の効果」 以上の様にこの発明によれば出力信号周波数の周波数安
定度は固定発振器の周波数変動に影優されることなく、
同波数シンセサイザの出力周政数のみによって決定され
る為固定発振器は安価なもので構成でき、また、周波数
同調確度の高いものが得られる効果がある。[Effects of the Invention] As described above, according to the present invention, the frequency stability of the output signal frequency is not influenced by the frequency fluctuation of the fixed oscillator.
Since it is determined only by the output frequency of the same wave number synthesizer, the fixed oscillator can be constructed with an inexpensive one, and has the effect of providing a high frequency tuning accuracy.

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

第１図は従来の同波数同調回路を示すブロック図、第２
図はこの発明の一実施例による周波数同調回路を示すブ
ロック図である。 図中、（１）は信号入力端子、（２）は周波数シンセサ
イザ、（３）　（５）は周波数変換器、（４）はフィル
タ、（６）は固定発振器、（７）は信号Ｈカ端子、（２
ａ）はＶＣＯｌ（２ｂ）ｔ／′ｉループフィルタ、（２
ｃ）は位相比較器、（２ｄ）は基準発振器、（２ｅ）ｔ
／′ｉ同波数変換器、（２ｆ）は可変分間器である。 なお図中同一符号は同−又は相当部分を示す代　理　人
　大　岩　増　雄Figure 1 is a block diagram showing a conventional same-wavenumber tuning circuit;
The figure is a block diagram showing a frequency tuning circuit according to an embodiment of the present invention. In the figure, (1) is a signal input terminal, (2) is a frequency synthesizer, (3), (5) is a frequency converter, (4) is a filter, (6) is a fixed oscillator, and (7) is a signal H terminal. ,(2
a) is VCOl (2b) t/'i loop filter, (2
c) is a phase comparator, (2d) is a reference oscillator, (2e) t
/'i is the same wave number converter, (2f) is a variable divider. The same symbols in the figures indicate the same or equivalent parts.

Claims (1)

【特許請求の範囲】[Claims] 所要周波の帯域通過特性を有するフィルタを介して２つ
の同波数変換器を縦続接続し、その前段側および後段側
の周波数変換器にそれぞれ同波数シンセサイザおよび固
定発振器の発信出力信号分供給し、入力信号の同波数に
応じて上記周波数シンセサイザの可変周器の分局比を制
御することにより出力信号の周波数を一定に維持する周
波数同調回路において、上記周波数シンセサイザの出力
周波数を上記固定発振器の発信同波故に応じて制御する
ことを特徴とする周波数同調回路。Two equal wave number converters are connected in cascade through a filter having band-pass characteristics for the required frequency, and the oscillation output signals of the same wave number synthesizer and fixed oscillator are supplied to the preceding and subsequent frequency converters, respectively, and the input signal is In a frequency tuning circuit that maintains the frequency of the output signal constant by controlling the division ratio of the variable frequency generator of the frequency synthesizer according to the same wave number of the signal, the output frequency of the frequency synthesizer is adjusted to the same wave frequency as the fixed oscillator. Therefore, a frequency tuning circuit is characterized in that it is controlled accordingly.
JP18817883A 1983-10-05 1983-10-05 Frequency tuning circuit Pending JPS6079832A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18817883A JPS6079832A (en) 1983-10-05 1983-10-05 Frequency tuning circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18817883A JPS6079832A (en) 1983-10-05 1983-10-05 Frequency tuning circuit

Publications (1)

Publication Number Publication Date
JPS6079832A true JPS6079832A (en) 1985-05-07

Family

ID=16219128

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18817883A Pending JPS6079832A (en) 1983-10-05 1983-10-05 Frequency tuning circuit

Country Status (1)

Country Link
JP (1) JPS6079832A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04131053U (en) * 1991-05-27 1992-12-01 株式会社アドバンテスト Heterodyne frequency conversion circuit
JP2007259211A (en) * 2006-03-24 2007-10-04 Nec Corp Local oscillator and radio transceiver using it

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04131053U (en) * 1991-05-27 1992-12-01 株式会社アドバンテスト Heterodyne frequency conversion circuit
JP2007259211A (en) * 2006-03-24 2007-10-04 Nec Corp Local oscillator and radio transceiver using it

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