JPH0425307U - - Google Patents

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Publication number
JPH0425307U
JPH0425307U JP6549090U JP6549090U JPH0425307U JP H0425307 U JPH0425307 U JP H0425307U JP 6549090 U JP6549090 U JP 6549090U JP 6549090 U JP6549090 U JP 6549090U JP H0425307 U JPH0425307 U JP H0425307U
Authority
JP
Japan
Prior art keywords
oscillation
frequency
capacitor
converter
trimming
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
JP6549090U
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 JP6549090U priority Critical patent/JPH0425307U/ja
Publication of JPH0425307U publication Critical patent/JPH0425307U/ja
Pending legal-status Critical Current

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  • Oscillators With Electromechanical Resonators (AREA)

Description

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

第１図はこの考案に係る周波数微調整回路の実
施例を示す回路図である。第２図は従来例の水晶
発振回路を示す回路図である。 主な符号の説明、１……マイクロプロセツサ、
２……Ｅ２ＰＲＯＭ、３，４……Ｄ／Ａコンバー
タ、５，６……バツフアアンプ、Ｄ１，Ｄ２……
可変容量ダイオード、Ｘ１……水晶振動子、Ｑ１
……トランジスタ。 FIG. 1 is a circuit diagram showing an embodiment of the frequency fine adjustment circuit according to this invention. FIG. 2 is a circuit diagram showing a conventional crystal oscillation circuit. Explanation of main symbols, 1...Microprocessor,
2... E2 PROM, 3,4...D/A converter, 5,6...Buffer amplifier, D1 , D2 ...
Variable capacitance diode, X 1 ... Crystal resonator, Q 1
 ...Transistor.

Claims (1)

【実用新案登録請求の範囲】 水晶振動子と、トランジスタと、抵抗及びコン
デンサと、発振周波数の微調整を行うためのトリ
ミングキヤパシタとで、構成された水晶発振回路
において、 前記トリミングキヤパシタの接続される回路に
可変容量ダイオードと、この可変容量ダイオード
を制御するＤ／Ａコンバータと、バツフアアンプ
とを設け、マイクロプロセツサよりＤ／Ａコンバ
ータに入力されるトリミングデータによつて、水
晶発振回路の発振周波数を微調整するように構成
したことを特徴とする周波数微調整回路。[Claims for Utility Model Registration] In a crystal oscillator circuit configured of a crystal resonator, a transistor, a resistor and a capacitor, and a trimming capacitor for finely adjusting the oscillation frequency, a connection of the trimming capacitor. A variable capacitance diode, a D/A converter for controlling the variable capacitance diode, and a buffer amplifier are provided in the circuit to be controlled, and the oscillation of the crystal oscillation circuit is performed by trimming data input from the microprocessor to the D/A converter. A frequency fine adjustment circuit configured to finely adjust a frequency.
JP6549090U 1990-06-22 1990-06-22 Pending JPH0425307U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6549090U JPH0425307U (en) 1990-06-22 1990-06-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6549090U JPH0425307U (en) 1990-06-22 1990-06-22

Publications (1)

Publication Number Publication Date
JPH0425307U true JPH0425307U (en) 1992-02-28

Family

ID=31597366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6549090U Pending JPH0425307U (en) 1990-06-22 1990-06-22

Country Status (1)

Country Link
JP (1) JPH0425307U (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61118004A (en) * 1984-11-14 1986-06-05 Matsushita Electric Works Ltd Crystal oscillation circuit
JPH01208905A (en) * 1988-02-16 1989-08-22 General Res Obu Erekutoronitsukusu:Kk Temperature compensated crystal oscillator by microcomputer control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61118004A (en) * 1984-11-14 1986-06-05 Matsushita Electric Works Ltd Crystal oscillation circuit
JPH01208905A (en) * 1988-02-16 1989-08-22 General Res Obu Erekutoronitsukusu:Kk Temperature compensated crystal oscillator by microcomputer control

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