JPS5539417A - Angle modulation circuit - Google Patents
Angle modulation circuitInfo
- Publication number
- JPS5539417A JPS5539417A JP11177578A JP11177578A JPS5539417A JP S5539417 A JPS5539417 A JP S5539417A JP 11177578 A JP11177578 A JP 11177578A JP 11177578 A JP11177578 A JP 11177578A JP S5539417 A JPS5539417 A JP S5539417A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- pll
- modulation
- loop
- resistance
- 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
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/09—Modifications of modulator for regulating the mean frequency
- H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
- H03C3/0966—Modifications of modulator for regulating the mean frequency using a phase locked loop modulating the reference clock
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/09—Modifications of modulator for regulating the mean frequency
- H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
- H03C3/0941—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation at more than one point in the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/09—Modifications of modulator for regulating the mean frequency
- H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
- H03C3/095—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation to the loop in front of the voltage controlled oscillator
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To obtain a high-performance PLL-type angle modulator circuit by using a simple modulation sensitivity compensating circuit. CONSTITUTION:Digital synthesizer 1 is used as the local oscillator of the receiver and consists of dividers 2 and 3, phase detector 4, LPF5 and VCO (Voltage Control Oscillator) 6. Thus the phase cycle is secured between the reception local oscillation frequency and the transmission output frequency via the PLL theory. Resistance R2 is provided in series to capacitor C0 and resistance R0 of the LPF structure, and the modulation signals are applied across R2. In terms of the loop constant calculation of the PLL, R2 is included into R0 in conception with no effect given to the loop characteristics. Furthermore, the reactance of C0 can be ignored to the modulation frequency by selecting an appropriate loop band width, thus ensuring the good modulation frequency characteristics. In addition, the ratio between resistances Rx and Ry is varies through switching of analog multiplexer 7 in order to give compensation to the variation of the deviation frequency for the VOC.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11177578A JPS5539417A (en) | 1978-09-13 | 1978-09-13 | Angle modulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11177578A JPS5539417A (en) | 1978-09-13 | 1978-09-13 | Angle modulation circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5539417A true JPS5539417A (en) | 1980-03-19 |
Family
ID=14569844
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11177578A Pending JPS5539417A (en) | 1978-09-13 | 1978-09-13 | Angle modulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5539417A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6016706A (en) * | 1984-06-25 | 1985-01-28 | Matsushita Electric Ind Co Ltd | Fm modulation circuit |
US4573026A (en) * | 1984-02-29 | 1986-02-25 | Hewlett-Packard Company | FM Modulator phase-locked loop with FM calibration |
US7667553B2 (en) | 2006-02-15 | 2010-02-23 | Rohm Co., Ltd. | Frequency modulator using PLL |
-
1978
- 1978-09-13 JP JP11177578A patent/JPS5539417A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4573026A (en) * | 1984-02-29 | 1986-02-25 | Hewlett-Packard Company | FM Modulator phase-locked loop with FM calibration |
JPS6016706A (en) * | 1984-06-25 | 1985-01-28 | Matsushita Electric Ind Co Ltd | Fm modulation circuit |
US7667553B2 (en) | 2006-02-15 | 2010-02-23 | Rohm Co., Ltd. | Frequency modulator using PLL |
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