JPS5866719U - Video intermediate frequency amplification circuit - Google Patents
Video intermediate frequency amplification circuitInfo
- Publication number
- JPS5866719U JPS5866719U JP16031081U JP16031081U JPS5866719U JP S5866719 U JPS5866719 U JP S5866719U JP 16031081 U JP16031081 U JP 16031081U JP 16031081 U JP16031081 U JP 16031081U JP S5866719 U JPS5866719 U JP S5866719U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- video intermediate
- amplification circuit
- frequency amplification
- bandpass 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
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の映像中間周波増幅回路を示す回路図、第
２図は本考案の実施例に係る映像中間局 −波増幅回路
を示す回路図、第３図はフォワード方式の場合の高周波
自動利得制御特性を示す特性図、第４図はリバース方式
の場合の同様特性図である。
３・・・弾性表面波フィルター、７・・・増幅回路、８
・・・τ型減衰器、１０・・・検出スイッチング回路。FIG. 1 is a circuit diagram showing a conventional video intermediate frequency amplification circuit, FIG. 2 is a circuit diagram showing a video intermediate frequency amplification circuit according to an embodiment of the present invention, and FIG. A characteristic diagram showing gain control characteristics, and FIG. 4 is a similar characteristic diagram in the case of the reverse method. 3...Surface acoustic wave filter, 7...Amplification circuit, 8
... τ type attenuator, 10... detection switching circuit.
Claims (1)
、これを増幅する映像中間周波増幅回路において、上記
帯域フィルターにπ型減衰器を挿入し、チューナの入力
電界の大小に応じて検出した利得制御電圧に基づいてこ
のπ型減衰器が上記帯域フィルターに対し電気的縦列介
装および切離サレるように検出スイッチング回路を具備
したことを特徴とする映像中間周波増幅回路。In a video intermediate frequency amplifier circuit that guides the tuner output to an amplifier circuit via a bandpass filter and amplifies it, a π-type attenuator is inserted in the bandpass filter, and the gain control voltage is detected according to the magnitude of the input electric field of the tuner. 1. A video intermediate frequency amplification circuit characterized in that the π-type attenuator is equipped with a detection switching circuit so that the π-type attenuator is electrically connected in series with and separated from the bandpass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16031081U JPS5866719U (en) | 1981-10-29 | 1981-10-29 | Video intermediate frequency amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16031081U JPS5866719U (en) | 1981-10-29 | 1981-10-29 | Video intermediate frequency amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5866719U true JPS5866719U (en) | 1983-05-06 |
Family
ID=29952724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16031081U Pending JPS5866719U (en) | 1981-10-29 | 1981-10-29 | Video intermediate frequency amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5866719U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62112408A (en) * | 1985-11-11 | 1987-05-23 | Matsushita Electric Ind Co Ltd | Booster for television receiver |
| JPS62112409A (en) * | 1985-11-11 | 1987-05-23 | Matsushita Electric Ind Co Ltd | Booster for television receiver |
-
1981
- 1981-10-29 JP JP16031081U patent/JPS5866719U/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62112408A (en) * | 1985-11-11 | 1987-05-23 | Matsushita Electric Ind Co Ltd | Booster for television receiver |
| JPS62112409A (en) * | 1985-11-11 | 1987-05-23 | Matsushita Electric Ind Co Ltd | Booster for television receiver |
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