JPS5866718U - Video intermediate frequency amplification circuit - Google Patents
Video intermediate frequency amplification circuitInfo
- Publication number
- JPS5866718U JPS5866718U JP16030981U JP16030981U JPS5866718U JP S5866718 U JPS5866718 U JP S5866718U JP 16030981 U JP16030981 U JP 16030981U JP 16030981 U JP16030981 U JP 16030981U JP S5866718 U JPS5866718 U JP S5866718U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- video intermediate
- amplification circuit
- frequency amplification
- 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.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (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の回路図、第２図
は本考案の一実施例に係る映像中間周波増幅回路の回路
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同上特性
図である。
−３・・・・・・ＶＩＰプリアンプ、１３・・・・・・
ＰＳフィルタ、１７・・・・・・映像中間周波増幅器、
２１．２２・・・・・・抵抗、２３・・・・・・検出ス
イッチング回路、２４・・・・・・トランジスタ、２７
・・・・・・第１スイツチングトランジスタ、２９・・
・・・・第２スイツチングトランジスタ、３０・・・・
・・高周波バイパス用コンデンサ。Fig. 1 is a circuit diagram of a conventional video intermediate frequency amplification circuit, Fig. 2 is a circuit diagram of a video intermediate frequency amplification circuit according to an embodiment of the present invention, and Fig. 3 is a high frequency automatic gain control characteristic in the case of a forward method. FIG. 4 is a characteristic diagram showing the same as above for the reverse method. -3...VIP preamplifier, 13...
PS filter, 17...video intermediate frequency amplifier,
21.22...Resistor, 23...Detection switching circuit, 24...Transistor, 27
...First switching transistor, 29...
...Second switching transistor, 30...
・High frequency bypass capacitor.
Claims (1)
具備した映像中間周波増幅回路において、映像中間周波
前段増器内の増幅用トランジスタの出力負荷抵抗を、検
出スイッチング回路を介して接地し、且つ検波増幅回路
からの高周波自動利得制御電圧によってこの検出スイッ
チング回路を制御し、上記利得制御電圧値に応じて前記
出力負荷抵抗のアース接続乃至断路を、切換自在とした
ことを特徴とする映像中間周波増幅回路。In a video intermediate frequency amplification circuit equipped with a video intermediate frequency front-stage amplifier and an acoustic wave surface wave filter, the output load resistance of the amplification transistor in the video intermediate frequency front-stage amplifier is grounded via a detection switching circuit, and A video intermediate frequency amplification circuit characterized in that the detection switching circuit is controlled by a high frequency automatic gain control voltage from the circuit, and the connection or disconnection of the output load resistor to earth can be switched according to the gain control voltage value. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16030981U JPS5866718U (en) | 1981-10-29 | 1981-10-29 | Video intermediate frequency amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16030981U JPS5866718U (en) | 1981-10-29 | 1981-10-29 | Video intermediate frequency amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5866718U true JPS5866718U (en) | 1983-05-06 |
Family
ID=29952723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16030981U Pending JPS5866718U (en) | 1981-10-29 | 1981-10-29 | Video intermediate frequency amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5866718U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01171179U (en) * | 1988-05-12 | 1989-12-04 |
-
1981
- 1981-10-29 JP JP16030981U patent/JPS5866718U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01171179U (en) * | 1988-05-12 | 1989-12-04 |
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