JPS5652924A - Tuning circuit - Google Patents
Tuning circuitInfo
- Publication number
- JPS5652924A JPS5652924A JP12908079A JP12908079A JPS5652924A JP S5652924 A JPS5652924 A JP S5652924A JP 12908079 A JP12908079 A JP 12908079A JP 12908079 A JP12908079 A JP 12908079A JP S5652924 A JPS5652924 A JP S5652924A
- Authority
- JP
- Japan
- Prior art keywords
- current
- resonance frequency
- resonance
- gradually
- controlling
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
Landscapes
- Superheterodyne Receivers (AREA)
Abstract
PURPOSE:To make it possible to remove a hysteresis phenomenon and to fix the resonance frequency to one against a controlling current value, by making it possible to execute the tuning operation by only one operation of increase or decrease of the controlling current. CONSTITUTION:In case the electric power source E for tuning is made high gradually and is resonated (tuned) to a desired frequency, the current controlling circuit A only performs a linear operation for generating the output voltage which is proportional to the input voltage. Accordingly, the winding L1 for resonance, and the resonance frequency of the resonance circuit of the capacitor C are varied gradually as the frequencies f1 f2 f3 in accordance with the currents i1 i2 i3 as shown in the figure. On the other hand, in case the resonance frequency is lowered in thd direction of f3 f2 f1, the current controlling circuit A operates, and lowers the current (i) to i1 once, so that it can reach a desired current value gradually after the fixed current (i) has been given. Accordingly, the current variation of the winding L3 for control always becomes one direction such as low to high currents, irrespective of the displacement direction of magnitude of the resonance frequency f0.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12908079A JPS5652924A (en) | 1979-10-05 | 1979-10-05 | Tuning circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12908079A JPS5652924A (en) | 1979-10-05 | 1979-10-05 | Tuning circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5652924A true JPS5652924A (en) | 1981-05-12 |
Family
ID=15000577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12908079A Pending JPS5652924A (en) | 1979-10-05 | 1979-10-05 | Tuning circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5652924A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4945681U (en) * | 1972-07-27 | 1974-04-22 | ||
JPS5063466A (en) * | 1973-10-08 | 1975-05-29 |
-
1979
- 1979-10-05 JP JP12908079A patent/JPS5652924A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4945681U (en) * | 1972-07-27 | 1974-04-22 | ||
JPS5063466A (en) * | 1973-10-08 | 1975-05-29 |
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