JPS63181031U - - Google Patents
Info
- Publication number
- JPS63181031U JPS63181031U JP7344187U JP7344187U JPS63181031U JP S63181031 U JPS63181031 U JP S63181031U JP 7344187 U JP7344187 U JP 7344187U JP 7344187 U JP7344187 U JP 7344187U JP S63181031 U JPS63181031 U JP S63181031U
- Authority
- JP
- Japan
- Prior art keywords
- local oscillation
- frequency
- signal
- frequency divider
- phase
- 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 description 8
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
Description
第１図はこの考案の一実施例の全体構成を示す
ブロツク図、第２図は同実施例の構成を示す回路
図、第３図は従来のチユーナの一般的構成例を示
すブロツク図、第４図は従来の局部発振回路の欠
点を説明するためのブロツク図、第５図は従来の
局部発振回路の他の例を示すブロツク図である。
１……電圧制御発振器、６……分周器、７……
位相検波器、１０……ローパスフイルタ、２０…
…帯域可変型狭帯域フイルタ（バンドパスフイル
タ）、Ｖｓ……同調電圧、Ｓｏｓｃ……局部発振
信号。
FIG. 1 is a block diagram showing the overall configuration of an embodiment of this invention, FIG. 2 is a circuit diagram showing the configuration of the same embodiment, and FIG. 3 is a block diagram showing an example of the general configuration of a conventional tuner. FIG. 4 is a block diagram for explaining the drawbacks of the conventional local oscillation circuit, and FIG. 5 is a block diagram showing another example of the conventional local oscillation circuit. 1... Voltage controlled oscillator, 6... Frequency divider, 7...
Phase detector, 10...Low pass filter, 20...
... Bandwidth variable narrowband filter (band pass filter), Vs... Tuning voltage, Sosc... Local oscillation signal.
Claims (1)
電圧制御発振器と、前記局部発振信号を分周する
分周器と、所望の比率で分周された基準信号と前
記分周器の出力信号との位相差に対応する信号を
出力する位相検波器と、この位相検波器の出力信
号から高域成分を除去して同調電圧を作成し前記
電圧制御発振器に供給するローパスフイルタとを
有し、前記各構成要素によりフエイズロツクドル
ープが構成される局部発振回路において、通過周
波数が前記同調電圧によつて前記局部発振周波数
と一致するように制御されるバンドパスフイルタ
を前記分周器の前段に設けたことを特徴とする局
部発振回路。 A voltage controlled oscillator that generates a local oscillation signal to be supplied to a mixing circuit, a frequency divider that divides the frequency of the local oscillation signal, and a reference signal divided at a desired ratio and an output signal of the frequency divider. It has a phase detector that outputs a signal corresponding to the phase difference, and a low-pass filter that removes high-frequency components from the output signal of the phase detector to create a tuning voltage and supplies it to the voltage controlled oscillator. In a local oscillation circuit whose components constitute a phase-locked loop, a bandpass filter whose pass frequency is controlled by the tuning voltage to match the local oscillation frequency is provided in front of the frequency divider. A local oscillation circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7344187U JPS63181031U (en) | 1987-05-15 | 1987-05-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7344187U JPS63181031U (en) | 1987-05-15 | 1987-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63181031U true JPS63181031U (en) | 1988-11-22 |
Family
ID=30917773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7344187U Pending JPS63181031U (en) | 1987-05-15 | 1987-05-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63181031U (en) |
-
1987
- 1987-05-15 JP JP7344187U patent/JPS63181031U/ja active Pending