JPH01100516U - - Google Patents
Info
- Publication number
- JPH01100516U JPH01100516U JP19676787U JP19676787U JPH01100516U JP H01100516 U JPH01100516 U JP H01100516U JP 19676787 U JP19676787 U JP 19676787U JP 19676787 U JP19676787 U JP 19676787U JP H01100516 U JPH01100516 U JP H01100516U
- Authority
- JP
- Japan
- Prior art keywords
- phase
- controlled oscillator
- intermediate frequency
- output signal
- voltage controlled
- 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 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図はこの考案によるフエーズロツクドルー
プ復調装置の１実施例を用いた衛星放送用チユー
ナのブロツク図、第２図は従来のフエーズロツク
ドループ復調装置の１例を用いた衛星放送用チユ
ーナのブロツク図、第３図は従来のフエーズロツ
クドループ復調装置の他の例を用いた衛星放送用
チユーナのブロツク図である。
５……電圧制御発振器、６……位相比較器、７
……ローパスフイルタ、９……ＰＩＮダイオード
（減衰器）。
Fig. 1 is a block diagram of a satellite broadcast tuner using an embodiment of the phase-locked loop demodulator according to this invention, and Fig. 2 is a block diagram of a satellite broadcast tuner using an example of the conventional phase-locked loop demodulator. FIG. 3 is a block diagram of a satellite broadcasting tuner using another example of the conventional phase-locked loop demodulator. 5... Voltage controlled oscillator, 6... Phase comparator, 7
...Low pass filter, 9...PIN diode (attenuator).
Claims (1)
振器と、自動利得制御回路で振幅が一定レベルと
された中間周波信号と上記電圧制御発振器からの
発振信号との位相を比較し、その位相差に応じた
出力信号を発生する位相比較器と、上記出力信号
を直流化し、上記電圧制御発振器に上記制御電圧
として供給すると共に、復調出力信号として出力
するローパスフイルタとを具備し、上記位相比較
器の上記中間周波信号の入力側に上記中間周波信
号に対し減衰量を可変できる減衰器を設けたこと
を特徴とするフエーズロツクドループ復調装置。 A voltage controlled oscillator that oscillates at a frequency according to the control voltage, an intermediate frequency signal whose amplitude is kept at a constant level by an automatic gain control circuit, and the phase of the oscillation signal from the voltage controlled oscillator are compared, and the phase difference is determined according to the phase difference. the output signal of the phase comparator; and a low-pass filter that converts the output signal into DC, supplies it to the voltage controlled oscillator as the control voltage, and outputs it as a demodulated output signal. 1. A phase-locked loop demodulator, characterized in that an attenuator is provided on the input side of the intermediate frequency signal, the amount of attenuation of which can be varied with respect to the intermediate frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19676787U JPH01100516U (en) | 1987-12-24 | 1987-12-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19676787U JPH01100516U (en) | 1987-12-24 | 1987-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01100516U true JPH01100516U (en) | 1989-07-06 |
Family
ID=31487363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19676787U Pending JPH01100516U (en) | 1987-12-24 | 1987-12-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01100516U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6027480A (en) * | 1983-07-21 | 1985-02-12 | Takashi Kanda | Welding device for kitchen sink |
| JPS6178226A (en) * | 1984-09-26 | 1986-04-21 | Nec Corp | Phase locked loop |
-
1987
- 1987-12-24 JP JP19676787U patent/JPH01100516U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6027480A (en) * | 1983-07-21 | 1985-02-12 | Takashi Kanda | Welding device for kitchen sink |
| JPS6178226A (en) * | 1984-09-26 | 1986-04-21 | Nec Corp | Phase locked loop |
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