JPH0446726U - - Google Patents
Info
- Publication number
- JPH0446726U JPH0446726U JP8870990U JP8870990U JPH0446726U JP H0446726 U JPH0446726 U JP H0446726U JP 8870990 U JP8870990 U JP 8870990U JP 8870990 U JP8870990 U JP 8870990U JP H0446726 U JPH0446726 U JP H0446726U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- phase
- synchronization
- voltage
- loop filter
- 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
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図ａ，ｂは、この考案の一実施例による位
相同期ループ回路の機能構成を示した図、第２図
ａ，ｂはこの考案の他の実施例による機能構成を
表わす図。第３図ａ，ｂは従来の位相同期ループ
回路の例を示す図である。
図において、１……基準入力端子、２……相相
比較器、第３図３ａ，３ｂ，３ｃループフイルタ
、４……電圧制御発振器（ＣＶＯ）、５ａ，５ｂ
，６ａ，６ｃ，１２……アナログスイツチ、７…
…インバーター回路、８……低域濾波器、９……
トリガ回路、１０……ＯＲ回路、１１……パワー
オンリセツト信号入力端子、Ｒ１，Ｒ２，Ｒ３，
Ｒ４……抵抗、Ｃ……コンデンサ、Ａ……増幅器
。なお、図中、同一符号は同一、または相当部分
を示す。
1A and 1B are diagrams showing the functional configuration of a phase-locked loop circuit according to one embodiment of the invention, and FIGS. 2A and 2B are diagrams showing the functional configuration according to another embodiment of the invention. FIGS. 3a and 3b are diagrams showing examples of conventional phase-locked loop circuits. In the figure, 1... Reference input terminal, 2... Phase comparator, Figure 3 loop filter 3a, 3b, 3c, 4... Voltage controlled oscillator (CVO), 5a, 5b
, 6a, 6c, 12...Analog switch, 7...
...Inverter circuit, 8...Low-pass filter, 9...
Trigger circuit, 10...OR circuit, 11...Power-on reset signal input terminal, R1, R2, R3,
R4...Resistor, C...Capacitor, A...Amplifier. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
いて、位相比較器の出力を電圧制御発振器（ＶＣ
Ｏ）の制御電圧とするための第１のループフイル
タ（定常用）と、同期外れ・電源投入時用の第２
のループフイルタ（再同期用）と、その２種類の
フイルタを切替えるスイツチと、同期外れ時にそ
の状態を判定するトリガ回路と、同期外れ信号と
電源投入信号のＯＲをとるＯＲ回路を備えた位相
同期ループ回路。 In the phase-locked loop circuit of a frequency synthesizer, the output of the phase comparator is connected to a voltage-controlled oscillator (VC
The first loop filter (for steady-state use) is used to control the voltage of
A phase synchronization system that is equipped with a loop filter (for resynchronization), a switch that switches between the two types of filters, a trigger circuit that determines the state when synchronization is lost, and an OR circuit that ORs the synchronization loss signal and the power-on signal. loop circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8870990U JPH0446726U (en) | 1990-08-24 | 1990-08-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8870990U JPH0446726U (en) | 1990-08-24 | 1990-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0446726U true JPH0446726U (en) | 1992-04-21 |
Family
ID=31822163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8870990U Pending JPH0446726U (en) | 1990-08-24 | 1990-08-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0446726U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013031012A (en) * | 2011-07-28 | 2013-02-07 | Toshiba Corp | Pll |
-
1990
- 1990-08-24 JP JP8870990U patent/JPH0446726U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013031012A (en) * | 2011-07-28 | 2013-02-07 | Toshiba Corp | Pll |