JPS6364131U - - Google Patents
Info
- Publication number
- JPS6364131U JPS6364131U JP15771586U JP15771586U JPS6364131U JP S6364131 U JPS6364131 U JP S6364131U JP 15771586 U JP15771586 U JP 15771586U JP 15771586 U JP15771586 U JP 15771586U JP S6364131 U JPS6364131 U JP S6364131U
- Authority
- JP
- Japan
- Prior art keywords
- output
- operational amplifier
- loop filter
- oscillation
- voltage
- 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
- 230000010355 oscillation Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図は本考案の一実施例の回路図である。
１……位相比較器、２……基準周波数発振器、
３……可変分周器、４……オペアンプ、５１，５
２，５３……電圧制御発振器、１１Ａ，１１Ｂ…
…スイツチ、７……ＦＥＴ、９……可変電圧源、
１０……可変電圧源、８……抵抗。
FIG. 1 is a circuit diagram of an embodiment of the present invention. 1... Phase comparator, 2... Reference frequency oscillator,
3... variable frequency divider, 4... operational amplifier, 51,5
2, 53... Voltage controlled oscillator, 11A, 11B...
...Switch, 7...FET, 9...Variable voltage source,
10...variable voltage source, 8...resistance.
Claims (1)
複数の電圧制御発振器の一つを撰選択してその入
力端を前記ループ・フイルタの出力端に接続する
発振手段と、この発振手段の発振出力を分周する
可変分周器と、この可変分周器の出力を基準周波
数発振器の発振出力と比較する位相比較器とを具
備するＰＬＬ回路において、さらに前記位相比較
器の出力をＦＥＴと抵抗の直列回路により分圧し
て前記ループ・フイルタの入力とする分圧回路と
、前記オペアンプの比較電位を可変する電圧源と
を具備することを特徴とするＰＬＬ回路。 A loop filter consisting of an operational amplifier,
oscillation means for selecting one of a plurality of voltage controlled oscillators and connecting its input terminal to the output terminal of the loop filter; a variable frequency divider for dividing the oscillation output of the oscillation means; In a PLL circuit comprising a phase comparator for comparing an output of a frequency generator with an oscillation output of a reference frequency oscillator, the output of the phase comparator is further voltage-divided by a series circuit of an FET and a resistor to be input to the loop filter. 1. A PLL circuit comprising: a voltage divider circuit for changing the comparison potential of the operational amplifier; and a voltage source for varying the comparison potential of the operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15771586U JPS6364131U (en) | 1986-10-14 | 1986-10-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15771586U JPS6364131U (en) | 1986-10-14 | 1986-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6364131U true JPS6364131U (en) | 1988-04-27 |
Family
ID=31080521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15771586U Pending JPS6364131U (en) | 1986-10-14 | 1986-10-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6364131U (en) |
-
1986
- 1986-10-14 JP JP15771586U patent/JPS6364131U/ja active Pending