JPH0419029U - - Google Patents
Info
- Publication number
- JPH0419029U JPH0419029U JP5845390U JP5845390U JPH0419029U JP H0419029 U JPH0419029 U JP H0419029U JP 5845390 U JP5845390 U JP 5845390U JP 5845390 U JP5845390 U JP 5845390U JP H0419029 U JPH0419029 U JP H0419029U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- voltage controlled
- oscillation
- oscillation 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
- 230000010355 oscillation Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図はこの考案の実施例を示すもので、ＰＬ
Ｌ回路を示すブロツク図である。第２図は従来の
ＰＬＬ回路の一例を示すブロツク図である。
４……位相比較回路、５……低域通過フイルタ
、６……第１の電圧制御発振回路、１０……第２
の電圧制御発振回路、２０……ＣＰＵ。
Figure 1 shows an example of this invention.
FIG. 3 is a block diagram showing an L circuit. FIG. 2 is a block diagram showing an example of a conventional PLL circuit. 4... Phase comparison circuit, 5... Low pass filter, 6... First voltage controlled oscillation circuit, 10... Second
voltage controlled oscillation circuit, 20...CPU.
Claims (1)
の電圧制御発振回路、および基準発振回路の基準
周波数信号と第１の電圧制御発振回路の出力信号
との位相を比較し、その位相差に応じた電圧を発
生して第１の電圧制御発振回路の発振周波数を制
御する位相比較回路からなるＰＬＬ回路において
、 上記基準発振回路として用いられる第２の電圧
制御発振回路、 上記第１の電圧制御発振回路の発振周波数を制
御するための電圧を監視し、その電圧が位相ロツ
クの限界に至つたかどうかを判定する手段、およ
び 上記電圧が位相ロツクの限界に至つたときに、
位相ロツクが可能となるように第２の電圧制御発
振回路の発振周波数を制御するための電圧を調整
する基準信号調整手段、 を備えていることを特徴とするＰＬＬ回路。[Claims for Utility Model Registration] Reference oscillation circuit that outputs a reference frequency signal, first
The voltage controlled oscillator circuit compares the phases of the reference frequency signal of the reference oscillation circuit and the output signal of the first voltage controlled oscillator circuit, generates a voltage according to the phase difference, and operates the first voltage controlled oscillator circuit. In a PLL circuit consisting of a phase comparator circuit that controls the oscillation frequency of the second voltage controlled oscillation circuit used as the reference oscillation circuit, the voltage for controlling the oscillation frequency of the first voltage controlled oscillation circuit is monitored. , means for determining whether the voltage reaches the phase lock limit, and when the voltage reaches the phase lock limit,
A PLL circuit comprising: reference signal adjusting means for adjusting a voltage for controlling the oscillation frequency of the second voltage controlled oscillation circuit so as to enable phase locking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990058453U JP2586121Y2 (en) | 1990-06-04 | 1990-06-04 | PLL circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990058453U JP2586121Y2 (en) | 1990-06-04 | 1990-06-04 | PLL circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0419029U true JPH0419029U (en) | 1992-02-18 |
| JP2586121Y2 JP2586121Y2 (en) | 1998-12-02 |
Family
ID=31584077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990058453U Expired - Lifetime JP2586121Y2 (en) | 1990-06-04 | 1990-06-04 | PLL circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2586121Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63234725A (en) * | 1987-03-24 | 1988-09-30 | Matsushita Electric Ind Co Ltd | Frequency synthesizer |
-
1990
- 1990-06-04 JP JP1990058453U patent/JP2586121Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63234725A (en) * | 1987-03-24 | 1988-09-30 | Matsushita Electric Ind Co Ltd | Frequency synthesizer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2586121Y2 (en) | 1998-12-02 |