JPS5468622A - Voltage control oscillator of inverse logarithmic characteristics - Google Patents
Voltage control oscillator of inverse logarithmic characteristicsInfo
- Publication number
- JPS5468622A JPS5468622A JP13591977A JP13591977A JPS5468622A JP S5468622 A JPS5468622 A JP S5468622A JP 13591977 A JP13591977 A JP 13591977A JP 13591977 A JP13591977 A JP 13591977A JP S5468622 A JPS5468622 A JP S5468622A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- capacitor
- resistance
- inverse logarithmic
- vth
- 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.)
- Granted
Links
Landscapes
- Electrophonic Musical Instruments (AREA)
Abstract
PURPOSE: To improve the inverse logarithmic linearity, by taking the value of resistance for linearity correction connected in series to the capacitor for time constant of voltage or current control oscillator of linear characteristics larger than the optimum value.
CONSTITUTION: A control current Ic of a current control oscillator 2 flows from a constant voltage power source Vs through a capacitor for time constant 23 and a resistance for linearity correction 24. As the voltage across the capacitor 23 increases, when the voltage at point A becomes less than the threshold voltage VTH, the output of a voltage comparator 20 becomes high potential, and a monostable multivibrator 21 generates a pulse voltage of tw in width, thereby discharging the capacitor 23 completely. Therefore, the oscillator 2 oscillates with dummy sawtooth waveforms, and, supposing T' to be the time required for the voltage at point A to lower from Vs-Rc,Ic to VTH, the oscillation frequency fo will be fo1/(TwT')= Ic/{C(Vs-VTH)+Ic(tw-CR)}. Hence, when the resistance value Rc of the resistance 24 is Rc>tw/C, the inverse logarithmic line elevates as the current Ic increases, so that the inverse logarithmic linearity may be improved.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52135919A JPS606577B2 (en) | 1977-11-11 | 1977-11-11 | Anti-logarithmic characteristic voltage controlled oscillator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52135919A JPS606577B2 (en) | 1977-11-11 | 1977-11-11 | Anti-logarithmic characteristic voltage controlled oscillator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5468622A true JPS5468622A (en) | 1979-06-01 |
JPS606577B2 JPS606577B2 (en) | 1985-02-19 |
Family
ID=15162906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52135919A Expired JPS606577B2 (en) | 1977-11-11 | 1977-11-11 | Anti-logarithmic characteristic voltage controlled oscillator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS606577B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4737793U (en) * | 1971-05-19 | 1972-12-26 | ||
JPS5013666U (en) * | 1973-05-31 | 1975-02-13 |
-
1977
- 1977-11-11 JP JP52135919A patent/JPS606577B2/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4737793U (en) * | 1971-05-19 | 1972-12-26 | ||
JPS5013666U (en) * | 1973-05-31 | 1975-02-13 |
Also Published As
Publication number | Publication date |
---|---|
JPS606577B2 (en) | 1985-02-19 |
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