JPS5533311A - Frequency modulating device - Google Patents
Frequency modulating deviceInfo
- Publication number
- JPS5533311A JPS5533311A JP10486178A JP10486178A JPS5533311A JP S5533311 A JPS5533311 A JP S5533311A JP 10486178 A JP10486178 A JP 10486178A JP 10486178 A JP10486178 A JP 10486178A JP S5533311 A JPS5533311 A JP S5533311A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- diode
- frequency
- amplifier
- phase
- 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
- Amplifiers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
PURPOSE: To stabilize the operation as well as to improve the linearity by adding the resonance circuit comprising the variable diode and the coil to the positive feedback circuit.
CONSTITUTION: In the frequency modulating device, the positive feedback circuit through the output end of IC-formed amplifier 1 back to the input end of amplifier 1 via resistances 2 and 3 to decide the feedback quantity plus variable capacitor 4 to correct the phase. Then resonance circuit 8 comprising variable capacity diode 5, coil 6 and capacitor 7 to block the modulation signal is added to the frequency modulating circuit to realize the control for the necessary feedback quantity and phase. As a resolt, such oscillation circuit is formed in that the resonance frequency of circuit 8 is nearly identical to the oscillation frequency. Thus a frequency modulator can be obtained if modultion signal 9 is applied to diode 5. In other words, the phase properties of amplifier 1 is offset to the increment of n to secure the high- linearity modlation characteristics since circuit 8, containing diode 5 with which the value of n increases to the application voltage even through n is 2 or less, is added to the positive feedback circuit.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10486178A JPS5533311A (en) | 1978-08-30 | 1978-08-30 | Frequency modulating device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10486178A JPS5533311A (en) | 1978-08-30 | 1978-08-30 | Frequency modulating device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5533311A true JPS5533311A (en) | 1980-03-08 |
JPS625362B2 JPS625362B2 (en) | 1987-02-04 |
Family
ID=14392027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10486178A Granted JPS5533311A (en) | 1978-08-30 | 1978-08-30 | Frequency modulating device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5533311A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5899008A (en) * | 1981-12-08 | 1983-06-13 | Matsushita Electric Ind Co Ltd | Oscillation and modulation circuit |
JPS591210U (en) * | 1982-06-24 | 1984-01-06 | オンキヨー株式会社 | frequency modulation circuit |
-
1978
- 1978-08-30 JP JP10486178A patent/JPS5533311A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5899008A (en) * | 1981-12-08 | 1983-06-13 | Matsushita Electric Ind Co Ltd | Oscillation and modulation circuit |
JPS591210U (en) * | 1982-06-24 | 1984-01-06 | オンキヨー株式会社 | frequency modulation circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS625362B2 (en) | 1987-02-04 |
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