JPS609254A - Pulse modulation type frequency modulation circuit - Google Patents

Pulse modulation type frequency modulation circuit

Info

Publication number
JPS609254A
JPS609254A JP11504383A JP11504383A JPS609254A JP S609254 A JPS609254 A JP S609254A JP 11504383 A JP11504383 A JP 11504383A JP 11504383 A JP11504383 A JP 11504383A JP S609254 A JPS609254 A JP S609254A
Authority
JP
Japan
Prior art keywords
modulation
frequency modulation
frequency
pulse
circuit
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
JP11504383A
Other languages
Japanese (ja)
Inventor
Shinkichi Shimizu
信吉 清水
Noboru Wakatsuki
昇 若月
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11504383A priority Critical patent/JPS609254A/en
Publication of JPS609254A publication Critical patent/JPS609254A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To execute a pulse modulation type frequency modulation by a simple circuit configuration by providing a lithium tantalate vibrator and a voltage variable capacity diode, and executing a frequency modulation by applying a digital signal to this diode. CONSTITUTION:A pulse signal of a TTL level is inputted from an input terminal IN, and impressed to a variable capacity diode VD through a gate IG. A load capacity of a lithium tantalate vibrator X is varied by varying a capacity of the variable capacity diode VD in accordance with a variation of a level of said input signal, by which an oscillation frequency is varied. By a relation of this modulation voltage IN and a frequency shift of an output, a frequency modulation can be executed by using a digital signal of two levels of ''0''V and 5V as an input voltage.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は、パルス波形に１よる周波数変調回路に関し、
特にリチウムタンタレイト振動子を用いた発振回路にお
いて電圧可変容量ダイオードの容量をパルス波形によシ
変化させることにより周波数変調（ＦＭ）を行うように
した周波数変調回路に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a frequency modulation circuit based on a pulse waveform,
In particular, the present invention relates to a frequency modulation circuit that performs frequency modulation (FM) by changing the capacitance of a voltage variable capacitance diode depending on a pulse waveform in an oscillation circuit using a lithium tantalate resonator.

〔従来技術と問題点〕[Prior art and problems]

ディジタル４８号の伝送方式の一つとして周波数偏位方
式（ｆｒｅｑｕｅｎｃｙ　５ｈｉｆｔ　ｋｅｙｉｎｇ）
が用いられている。この周波数偏位方式においては、デ
ィジタル信号のマーク・スペースに対応して送信周波数
がｆＯとｆｌの間で切換えられる。従来、周波数偏位方
式においては、第１図に示されるような周波数変調回路
が用いられている。第１図の周波数変調回路においては
、発振周波数の異なる２つの、水晶発振子を用いた発振
回路（出力周波数ｆｏ　、　ｆｌ）１　、２が設けられ
、切換え回路５において、ディジタル信号ＤＳのマーク
・スペースに応じて２つの出力周波数が切換えて出力さ
れる。Frequency 5-hift keying is one of the transmission methods for Digital No. 48.
is used. In this frequency shift method, the transmission frequency is switched between fO and fl in accordance with the mark space of the digital signal. Conventionally, in the frequency deviation method, a frequency modulation circuit as shown in FIG. 1 has been used. In the frequency modulation circuit shown in FIG. 1, two oscillation circuits (output frequencies fo, fl) 1 and 2 using crystal oscillators with different oscillation frequencies are provided, and a switching circuit 5 switches between marks and marks of the digital signal DS. Two output frequencies are switched and output depending on the space.

この回路は、同一構成の２つの発振回路が設けられてお
り、回路が複雑であるという欠点がある。This circuit has two oscillation circuits having the same configuration, and has the disadvantage that the circuit is complicated.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、前記の従来技術の問題点にかんがみ、
リチウムタンタレイト振動子の負荷容量に対する発振周
波数の偏位が大きいことを利用して、ＴＴＬレベルのデ
ィジタル信号によシ直接周波数変調を行うことにより、
回路構成が簡略化され、かつ、出力歪みが少ないパルス
波形による周波数変調回路を提供することにある。In view of the problems of the prior art described above, the object of the present invention is to
By taking advantage of the large deviation of the oscillation frequency with respect to the load capacity of the lithium tantalate resonator, and performing direct frequency modulation with a TTL level digital signal,
It is an object of the present invention to provide a frequency modulation circuit using a pulse waveform with a simplified circuit configuration and low output distortion.

〔発明の構成〕[Structure of the invention]

前記の目的を達成するために、本発明においては、リチ
ウムタンタレイト振動子と、電圧可変容量ダイオードと
を備え、該電圧可変容量ダイオードにディジタル信号を
印加することによシ周波数変調を行わせるようにしたこ
とを特徴とする、パルス変調形層波数変調回路が提供さ
れる。In order to achieve the above object, the present invention includes a lithium tantalate resonator and a voltage variable capacitance diode, and frequency modulation is performed by applying a digital signal to the voltage variable capacitance diode. A pulse modulation type layered wave number modulation circuit is provided.

〔発明の実施例〕[Embodiments of the invention]

本発明の一実施例としてのパルス変調形層波数変調回路
が第２南に示される。ｖｆ、２図のパルス変調形層波数
変調回路は、リチウムタンタレイト振動子Ｘ％電圧可変
容量ダイオードＶＤ、ＴＴＬ入力グー）ＩＧ、出力トラ
ンジスタＴＲ１チヨークコイルＬ１、コンデンサＣ１、
Ｃ２、抵抗Ｒ，１ないしＲ６から構成される。A pulse modulated layered wavenumber modulation circuit according to one embodiment of the invention is shown in the second south. vf, the pulse modulation layer wave number modulation circuit shown in Figure 2 consists of a lithium tantalate oscillator
C2 and resistors R,1 to R6.

＠２図の回路において、チロ−クコイルＬ１はＴＴＬ側
への高周波の影響を阻止するものであり、ここにＦＭ出
力の側帯波（周波数）の制限を行うためのローパスフィ
ルタを挿入することも可能である。抵抗Ｒ１，Ｒ２，１
１は、可変容量ダイオードＶＤの直流バイアスを与える
ものである。抵抗Ｒ４，Ｒ５は、トランジスタＴＲのベ
ース電位を決定するバイアス抵抗である。抵抗Ｒ６は、
トランジスタＴＲのエミッタ電流を決定する抵抗である
。ここで、抵抗Ｒ６０代シにチロ−クコイルＬ２を入れ
ることも可能である。この場合出力電圧波高値は２倍に
なる。コンデンサＣＩ、Ｃ２は、発振条件を与えるコン
デンサである。第２図の回路全体としては、コレクタ接
地型のコルピック発振器を構成している。In the circuit shown in Figure @2, Chirok coil L1 blocks the influence of high frequencies on the TTL side, and it is also possible to insert a low-pass filter here to limit the sideband waves (frequency) of the FM output. It is. Resistance R1, R2, 1
1 provides a DC bias for the variable capacitance diode VD. Resistors R4 and R5 are bias resistors that determine the base potential of the transistor TR. Resistor R6 is
This is a resistor that determines the emitter current of the transistor TR. Here, it is also possible to insert a chiroke coil L2 in the 60's of resistor R. In this case, the output voltage peak value is doubled. Capacitors CI and C2 are capacitors that provide oscillation conditions. The entire circuit shown in FIG. 2 constitutes a common collector type Colpic oscillator.

第２図の回路においては、入力端子ＩＮからＴＴＬレベ
ルのパルス信号が入力され、ゲートＩＧを介して可変容
量ダイオードＶＤＫ印加される。入力信号のレベルの変
化に応じて可変容量ダイオードＶＤの容量を変化させる
ことによシ、リチウムタンタレイト振動子Ｘの負荷容量
を変化させ、それによル発振周波数を変化させる。第２
図の回路における変調電圧（ｉＮ）と出力の周波数偏位
の関係が第３図に示される。第３図かられかるように、
入力電圧としてＶｌ　−ＯＶとＶ２−ｓｖ０２レベルの
ディジタル信号を用いることによシ。In the circuit shown in FIG. 2, a TTL level pulse signal is input from the input terminal IN and applied to the variable capacitance diode VDK via the gate IG. By changing the capacitance of the variable capacitance diode VD in accordance with changes in the level of the input signal, the load capacitance of the lithium tantalate resonator X is changed, thereby changing the oscillation frequency. Second
The relationship between the modulation voltage (iN) and the frequency deviation of the output in the circuit shown in the figure is shown in FIG. As you can see from Figure 3,
By using digital signals of Vl-OV and V2-sv02 levels as input voltages.

直接周波数変調を行うことができる。Direct frequency modulation can be performed.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、ＴＴＬレベルにより直接周波数変調を
行うことができ、かつ、リチウムタンタレイト振動子を
用いることによ）回路構成を簡単化することができる、
パルス変調形周波数変調回路を提供することができる。According to the present invention, direct frequency modulation can be performed using the TTL level, and the circuit configuration can be simplified (by using a lithium tantalate oscillator).
A pulse modulated frequency modulation circuit can be provided.

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

第１図は、従来技術のパルス変調形層波数変調回路を示
し、 第２図は、本発明の一実施例としてのパルス変調形層波
数変調回路を示し、 第６図は、第２図の回路における変調電圧と周波数偏位
の関係を示す。 （符号の説明） １．２：発振回路、　３：切換え回路、Ｘｌ　、Ｘ２：
水晶振動子、　Ｘ：リチウムタンタレイト振動子、ＩＧ
：入力ゲート、 Ｔ几＋　’ｌ’　Ｒ１ｓ　Ｔ　Ｒ２：　）ランジスタ、
■Ｄ：電圧可変容量ダイオード、 Ｌｌ、Ｒ２：チ璽−クコイＩＬ’５ Ｃ１１，Ｃ１２，Ｃ１ｓ、Ｃ２１ｇＣ２２ＩＣ２−Ｃ１
１Ｃ２：コンデンサ、 Ｒ１１ｍ　”１２＋　”１５．”２ｆ−Ｒ２２１ＲＩ２
Ｓｅ　Ｒ１１ｅＲ２、Ｒ５、Ｒ４＊　Ｒｓ　ｅＲ６：抵
抗。 特許出願人 富士通株式会社 特許出願代理人 弁理士　青　木　朗 弁理士西舘和之 弁理士内田幸男 弁理士　山　口　昭　之FIG. 1 shows a conventional pulse modulation layer wave number modulation circuit, FIG. 2 shows a pulse modulation layer wave number modulation circuit as an embodiment of the present invention, and FIG. 6 shows a pulse modulation layer wave number modulation circuit of the prior art. The relationship between modulation voltage and frequency deviation in the circuit is shown. (Explanation of symbols) 1.2: Oscillation circuit, 3: Switching circuit, Xl, X2:
Crystal resonator, X: Lithium tantalate resonator, IG
: input gate, T + 'l' R1s T R2: ) transistor,
■D: Voltage variable capacitance diode, Ll, R2: Chi-kukoi IL'5 C11, C12, C1s, C21gC22IC2-C1
1C2: Capacitor, R11m "12+"15. ”2f-R221RI2
Se R11eR2, R5, R4* Rs eR6: Resistance. Patent applicant: Fujitsu Limited Patent application agent: Akira Aoki, patent attorney: Kazuyuki Nishidate, patent attorney: Yukio Uchida, patent attorney: Akira Yamaguchi

Claims (1)

【特許請求の範囲】[Claims] リチウムタンタレイト振動子と、電圧可変容量ダイオー
ドとを備え、該電圧可変容量ダイオードにディジタル信
号を印加することによシ周波数変調を行わせるようにし
たことを特徴とする、パルス変調形周波数変調回路。A pulse modulation type frequency modulation circuit comprising a lithium tantalate resonator and a voltage variable capacitance diode, the frequency modulation circuit being configured to perform frequency modulation by applying a digital signal to the voltage variable capacitance diode. .
JP11504383A 1983-06-28 1983-06-28 Pulse modulation type frequency modulation circuit Pending JPS609254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11504383A JPS609254A (en) 1983-06-28 1983-06-28 Pulse modulation type frequency modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11504383A JPS609254A (en) 1983-06-28 1983-06-28 Pulse modulation type frequency modulation circuit

Publications (1)

Publication Number Publication Date
JPS609254A true JPS609254A (en) 1985-01-18

Family

ID=14652769

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11504383A Pending JPS609254A (en) 1983-06-28 1983-06-28 Pulse modulation type frequency modulation circuit

Country Status (1)

Country Link
JP (1) JPS609254A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62116933A (en) * 1985-11-18 1987-05-28 Konishiroku Photo Ind Co Ltd Method for processing color reversal photographic sensitive material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5455353A (en) * 1977-10-12 1979-05-02 Meguro Electronics Frequency modulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5455353A (en) * 1977-10-12 1979-05-02 Meguro Electronics Frequency modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62116933A (en) * 1985-11-18 1987-05-28 Konishiroku Photo Ind Co Ltd Method for processing color reversal photographic sensitive material

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