JPS57103412A - Phase modulation system due to pll - Google Patents
Phase modulation system due to pllInfo
- Publication number
- JPS57103412A JPS57103412A JP55179285A JP17928580A JPS57103412A JP S57103412 A JPS57103412 A JP S57103412A JP 55179285 A JP55179285 A JP 55179285A JP 17928580 A JP17928580 A JP 17928580A JP S57103412 A JPS57103412 A JP S57103412A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- modulation
- pll
- modulation signal
- circuit
- 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
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
- H03C3/0975—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation in the phase locked loop at components other than the divider, the voltage controlled oscillator or 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
- H03C3/0958—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation by varying the characteristics of the voltage controlled oscillator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C2200/00—Indexing scheme relating to details of modulators or modulation methods covered by H03C
- H03C2200/0037—Functional aspects of modulators
- H03C2200/005—Modulation sensitivity
- H03C2200/0054—Filtering of the input modulating signal for obtaining a constant sensitivity of frequency modulation
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To modulate the phase independently of the frequency response characteristics of a PLL, by applying the modulation signal to a voltage-frequency converting circuit after being differentiated and adding the modulation signal before differentiation to a phase detection signal. CONSTITUTION:The modulation signal applied to an input terminal 1 is differentiated by a differentiating circuit 2 and is applied to a voltage-frequency converting circuit (VCO) 3 to obtain a modulated frequency signal PM at an output terminal 4, and the conventional modulation characteristics are obtained by a negative feedback loop PLL consisting of a frequency divider 5, a phase detector 6, an adding circuit 9, an active filter 8m and the VCO3. However, the modulation characteristic wherein the modulation signal applied to the input terminal 1 is applied to the adding circuit 9 are proportional to the conventional PLL response characteristics because the frequency divider 5 and the phase detector 6 have not the frequency characteristics. Thus, the modulation signal is applied to both circuits in a specific level relation to obtain the flat modulation characteristics up to a wide band from a low band of the modulation frequency.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55179285A JPS57103412A (en) | 1980-12-18 | 1980-12-18 | Phase modulation system due to pll |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55179285A JPS57103412A (en) | 1980-12-18 | 1980-12-18 | Phase modulation system due to pll |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57103412A true JPS57103412A (en) | 1982-06-28 |
JPS6322483B2 JPS6322483B2 (en) | 1988-05-12 |
Family
ID=16063151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55179285A Granted JPS57103412A (en) | 1980-12-18 | 1980-12-18 | Phase modulation system due to pll |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57103412A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4864257A (en) * | 1988-09-15 | 1989-09-05 | General Electric Company | Phase locked frequency synthesizer with single input gain compensated wideband modulation system |
US4866404A (en) * | 1988-09-15 | 1989-09-12 | General Electric Company | Phase locked frequency synthesizer with single input wideband modulation system |
US5281930A (en) * | 1991-06-04 | 1994-01-25 | Matsushita Electric Industrial Co., Ltd. | Frequency modulator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5272416A (en) * | 1975-12-15 | 1977-06-16 | Matsushita Electric Ind Co Ltd | Drive circuit for high frequency commutator motor |
-
1980
- 1980-12-18 JP JP55179285A patent/JPS57103412A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5272416A (en) * | 1975-12-15 | 1977-06-16 | Matsushita Electric Ind Co Ltd | Drive circuit for high frequency commutator motor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4864257A (en) * | 1988-09-15 | 1989-09-05 | General Electric Company | Phase locked frequency synthesizer with single input gain compensated wideband modulation system |
US4866404A (en) * | 1988-09-15 | 1989-09-12 | General Electric Company | Phase locked frequency synthesizer with single input wideband modulation system |
US5281930A (en) * | 1991-06-04 | 1994-01-25 | Matsushita Electric Industrial Co., Ltd. | Frequency modulator |
Also Published As
Publication number | Publication date |
---|---|
JPS6322483B2 (en) | 1988-05-12 |
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