JPH03103636U - - Google Patents
Info
- Publication number
- JPH03103636U JPH03103636U JP1100990U JP1100990U JPH03103636U JP H03103636 U JPH03103636 U JP H03103636U JP 1100990 U JP1100990 U JP 1100990U JP 1100990 U JP1100990 U JP 1100990U JP H03103636 U JPH03103636 U JP H03103636U
- Authority
- JP
- Japan
- Prior art keywords
- phase
- loop filter
- clock signal
- frequency difference
- detection
- 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
- 238000001514 detection method Methods 0.000 claims 3
- 230000003044 adaptive effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図はこの考案の一実施例による位相同期回
路の構成図、第２図は従来の位相同期回路の構成
である。
１は分周器、２は位相比較器、３はループフイ
ルタ、４はＶＣＸＯ、５，６，１１，１５，１６
は分周器、１２は位相比較器、１３はループフイ
ルタ、１４はＶＣＸＯ、１７，１８は周波数カウ
ンタ、１９は減算器、２０はＲＯＭ、１３１はＡ
／Ｄ、１３２はデイジタルフイルタ、１３３はＤ
／Ａ変換器、１３４はアナログローパスフイルタ
を示す。なお、図中、同一符号は同一、または相
当部分を示す。
FIG. 1 is a block diagram of a phase-locked circuit according to an embodiment of this invention, and FIG. 2 is a block diagram of a conventional phase-locked circuit. 1 is a frequency divider, 2 is a phase comparator, 3 is a loop filter, 4 is a VCXO, 5, 6, 11, 15, 16
is a frequency divider, 12 is a phase comparator, 13 is a loop filter, 14 is a VCXO, 17 and 18 are frequency counters, 19 is a subtracter, 20 is a ROM, and 131 is an A
/D, 132 is a digital filter, 133 is D
/A converter, 134 indicates an analog low pass filter. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
ク信号の周波数差を検出する周波数差検出部と、
前記検出部から検出信号により、位相同期回路の
ループフイルタの特性を制御する制御部を備えた
ループフイルタ適応型位相同期回路。 a frequency difference detection unit that detects a frequency difference between an input clock signal and an output clock signal of the phase synchronization circuit;
A loop filter adaptive phase-locked circuit comprising a control section that controls characteristics of a loop filter of the phase-locked circuit based on a detection signal from the detection section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1100990U JPH03103636U (en) | 1990-02-05 | 1990-02-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1100990U JPH03103636U (en) | 1990-02-05 | 1990-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03103636U true JPH03103636U (en) | 1991-10-28 |
Family
ID=31514553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1100990U Pending JPH03103636U (en) | 1990-02-05 | 1990-02-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03103636U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4718388B2 (en) * | 2006-07-28 | 2011-07-06 | 旭化成エレクトロニクス株式会社 | Frequency comparison circuit, PLL frequency synthesizer test circuit, and test method therefor |
-
1990
- 1990-02-05 JP JP1100990U patent/JPH03103636U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4718388B2 (en) * | 2006-07-28 | 2011-07-06 | 旭化成エレクトロニクス株式会社 | Frequency comparison circuit, PLL frequency synthesizer test circuit, and test method therefor |
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