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JPH0476711U - - Google Patents

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Publication number
JPH0476711U
JPH0476711U JP12141090U JP12141090U JPH0476711U JP H0476711 U JPH0476711 U JP H0476711U JP 12141090 U JP12141090 U JP 12141090U JP 12141090 U JP12141090 U JP 12141090U JP H0476711 U JPH0476711 U JP H0476711U
Authority
JP
Japan
Prior art keywords
oscillator
frequency
signals
television signal
resistor
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
JP12141090U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP12141090U priority Critical patent/JPH0476711U/ja
Publication of JPH0476711U publication Critical patent/JPH0476711U/ja
Pending legal-status Critical Current

Links

Description

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

第１図はこの考案の一実施例による周波数変調
器の回路図、第２図と第３図はこの考案の他の実
施例を示す回路図、第４図は従来の周波数変調器
の回路図である。 図において１は発振用トランジスタ、２はバラ
クタダイオード、３はコイル、４は抵抗、５はカ
ツプリングコンデンサ、６はコンデンサ、７は抵
抗、８はコンデンサ、９は抵抗、１０は抵抗、１
１は位相比較器、１２は基準発振器、１３はルー
プフイルター、１４はアース接地、１５は○＋電
圧、２１はオペアンプ、２２はオペアンプ入力抵
抗、２３，２４，２５はオフセツトバイアス設定
用抵抗、２６は周波数安定化用制御電圧結合抵抗
、２７は抵抗、２８はオペアンプ増幅率決定用抵
抗、３０はコンデンサ、３１はコンデンサである
。なお、図中、同一符号は同一、または相当部分
を示す。 Figure 1 is a circuit diagram of a frequency modulator according to one embodiment of this invention, Figures 2 and 3 are circuit diagrams showing other embodiments of this invention, and Figure 4 is a circuit diagram of a conventional frequency modulator. It is. In the figure, 1 is an oscillation transistor, 2 is a varactor diode, 3 is a coil, 4 is a resistor, 5 is a coupling capacitor, 6 is a capacitor, 7 is a resistor, 8 is a capacitor, 9 is a resistor, 10 is a resistor, 1
1 is a phase comparator, 12 is a reference oscillator, 13 is a loop filter, 14 is grounded, 15 is ○+ voltage, 21 is an operational amplifier, 22 is an operational amplifier input resistance, 23, 24, 25 are resistors for setting offset bias, 26 is a control voltage coupling resistor for frequency stabilization, 27 is a resistor, 28 is a resistor for determining the operational amplifier amplification factor, 30 is a capacitor, and 31 is a capacitor. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] テレビ信号を伝送する方式の一つである周波数
変調の発振器において、発振器に入力されるテレ
ビ信号と発振器内のバラクタダイオードに供給す
る固定バイアスと発振器の出力周波数を安定化さ
せる制御電圧各々をオペアンプを使用して合成さ
せ、テレビ信号の低周波伝送特性の改善をしたこ
とを特徴とする周波数変調器。 In a frequency modulation oscillator, which is one of the methods of transmitting television signals, an operational amplifier is used to control the television signal input to the oscillator, the fixed bias supplied to the varactor diode in the oscillator, and the control voltage that stabilizes the output frequency of the oscillator. A frequency modulator characterized in that the low frequency transmission characteristics of a television signal are improved by combining the signals.
JP12141090U 1990-11-19 1990-11-19 Pending JPH0476711U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12141090U JPH0476711U (en) 1990-11-19 1990-11-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12141090U JPH0476711U (en) 1990-11-19 1990-11-19

Publications (1)

Publication Number Publication Date
JPH0476711U true JPH0476711U (en) 1992-07-03

Family

ID=31869267

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12141090U Pending JPH0476711U (en) 1990-11-19 1990-11-19

Country Status (1)

Country Link
JP (1) JPH0476711U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007066672A1 (en) * 2005-12-06 2007-06-14 Rohm Co., Ltd. Frequency modulator and fm transmission circuit using the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56108B2 (en) * 1975-12-23 1981-01-06
JPS5720004A (en) * 1980-07-11 1982-02-02 Fujitsu Ltd Fm modulating and demodulating circuit
JPS6374206A (en) * 1986-09-12 1988-04-04 アエロスパティアル・ソシエテ・ナシヨナル・アンダストリエル Phase modulation system
JPH01243607A (en) * 1988-03-24 1989-09-28 Seiko Epson Corp Frequency modulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56108B2 (en) * 1975-12-23 1981-01-06
JPS5720004A (en) * 1980-07-11 1982-02-02 Fujitsu Ltd Fm modulating and demodulating circuit
JPS6374206A (en) * 1986-09-12 1988-04-04 アエロスパティアル・ソシエテ・ナシヨナル・アンダストリエル Phase modulation system
JPH01243607A (en) * 1988-03-24 1989-09-28 Seiko Epson Corp Frequency modulator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007066672A1 (en) * 2005-12-06 2007-06-14 Rohm Co., Ltd. Frequency modulator and fm transmission circuit using the same

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