JPS6449406A - Voltage controlled crystal oscillator - Google Patents
Voltage controlled crystal oscillatorInfo
- Publication number
- JPS6449406A JPS6449406A JP20693287A JP20693287A JPS6449406A JP S6449406 A JPS6449406 A JP S6449406A JP 20693287 A JP20693287 A JP 20693287A JP 20693287 A JP20693287 A JP 20693287A JP S6449406 A JPS6449406 A JP S6449406A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- diode
- variable capacitive
- frequency
- temperature characteristic
- 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
Links
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
PURPOSE:To improve a frequency temperature characteristic, by providing a voltage varying means utilizing the temperature characteristic of the voltage drop in a forward direction of a diode and whose output voltage changes with a temperature between a variable capacitive diode and the emitter of a transistor(TR). CONSTITUTION:The diode D1 as the voltage varying means is connected between one end of the variable capacitive diode 20 and the emitter of the TR. When the temperature rises, the voltage drop in the forward direction of the diode D1 is decreased, and a voltage to be impressed on one end of the variable capacitive diode 20 is decreased. When a frequency control voltage Vf is kept constant, an impressing voltage on the variable capacitive diode 20 is increased, and a capacity is reduced, thereby, an oscillatory frequency is raised, and the influence of an inductance 30 can be removed. Therefore, it is possible to obtain a VCXO with superior frequency temperature characteristic.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20693287A JPS6449406A (en) | 1987-08-20 | 1987-08-20 | Voltage controlled crystal oscillator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20693287A JPS6449406A (en) | 1987-08-20 | 1987-08-20 | Voltage controlled crystal oscillator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449406A true JPS6449406A (en) | 1989-02-23 |
Family
ID=16531434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20693287A Pending JPS6449406A (en) | 1987-08-20 | 1987-08-20 | Voltage controlled crystal oscillator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449406A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5176003A (en) * | 1990-09-05 | 1993-01-05 | Mitsubishi Denki Kabushiki Kaisha | Cryostat |
US5235818A (en) * | 1990-09-05 | 1993-08-17 | Mitsubishi Denki Kabushiki Kaisha | Cryostat |
US7397318B2 (en) | 2005-12-01 | 2008-07-08 | Mitsubishi Electric Corporation | Voltage-controlled oscillator |
-
1987
- 1987-08-20 JP JP20693287A patent/JPS6449406A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5176003A (en) * | 1990-09-05 | 1993-01-05 | Mitsubishi Denki Kabushiki Kaisha | Cryostat |
US5235818A (en) * | 1990-09-05 | 1993-08-17 | Mitsubishi Denki Kabushiki Kaisha | Cryostat |
US7397318B2 (en) | 2005-12-01 | 2008-07-08 | Mitsubishi Electric Corporation | Voltage-controlled oscillator |
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