JPS6411419A - Frequency synthesizer - Google Patents
Frequency synthesizerInfo
- Publication number
- JPS6411419A JPS6411419A JP62165289A JP16528987A JPS6411419A JP S6411419 A JPS6411419 A JP S6411419A JP 62165289 A JP62165289 A JP 62165289A JP 16528987 A JP16528987 A JP 16528987A JP S6411419 A JPS6411419 A JP S6411419A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- time
- application time
- variation
- 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
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
PURPOSE:To complete the variation of a set frequency in a short time by applying a fixed voltage forcibly to the capacitor of a time constant circuit of a filter circuit for a time corresponding to a frequency difference when the set frequency is varied. CONSTITUTION:When a new set frequency is inputted from a frequency setter 25, a frequency divider 13 is set to a corresponding frequency division ratio and a corresponding application time is calculated at the same time. For example, when the frequency is increased, a switching circuit 18 operates to apply the fixed voltage to the filter circuit 15 for the application time. The capacitor 15d is charged the application time later and a control voltage signal (d) outputted from the circuit 15 rises by an output voltage variation quantity. The circuit 18 returns to its last state the application time later and a signal from a frequency divider 13 is inputted to a phase comparator 12 and approximate to the set frequency after the variation. This PLL circuit is therefore put in phase in the short PLL response time.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62165289A JPS6411419A (en) | 1987-07-03 | 1987-07-03 | Frequency synthesizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62165289A JPS6411419A (en) | 1987-07-03 | 1987-07-03 | Frequency synthesizer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6411419A true JPS6411419A (en) | 1989-01-17 |
Family
ID=15809499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62165289A Pending JPS6411419A (en) | 1987-07-03 | 1987-07-03 | Frequency synthesizer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6411419A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007274081A (en) * | 2006-03-30 | 2007-10-18 | Mitsubishi Electric Corp | Phase locked loop type frequency synthesizer |
JP2008060688A (en) * | 2006-08-29 | 2008-03-13 | Yokogawa Electric Corp | Phase-locked loop circuit and signal generator unit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5856535A (en) * | 1981-09-30 | 1983-04-04 | Fujitsu Ltd | Oscillation circuit |
JPS5843045B2 (en) * | 1980-06-25 | 1983-09-24 | 耕一 南田 | How to dye trees |
-
1987
- 1987-07-03 JP JP62165289A patent/JPS6411419A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5843045B2 (en) * | 1980-06-25 | 1983-09-24 | 耕一 南田 | How to dye trees |
JPS5856535A (en) * | 1981-09-30 | 1983-04-04 | Fujitsu Ltd | Oscillation circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007274081A (en) * | 2006-03-30 | 2007-10-18 | Mitsubishi Electric Corp | Phase locked loop type frequency synthesizer |
JP2008060688A (en) * | 2006-08-29 | 2008-03-13 | Yokogawa Electric Corp | Phase-locked loop circuit and signal generator unit |
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