JPS648880U - - Google Patents
Info
- Publication number
- JPS648880U JPS648880U JP10346387U JP10346387U JPS648880U JP S648880 U JPS648880 U JP S648880U JP 10346387 U JP10346387 U JP 10346387U JP 10346387 U JP10346387 U JP 10346387U JP S648880 U JPS648880 U JP S648880U
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- agc
- circuit
- tuner
- input signal
- 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
- 230000001934 delay Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案を実施したＡＧＣ回路の回路図
であり、第２図は本考案の他の実施例の回路図で
ある。第３図は本考案による効果を示す特性図で
ある。第４図は遅延型のＡＧＣ回路の構成例を示
すブロツク図、第５図は従来のＡＧＣ回路を示す
図である。第６図はＩＦ・ＡＧＣ特性図、第７図
はＲＦ・ＡＧＣ特性図である。
１……チユーナ、３……ＲＦ増幅器、７……Ｉ
Ｆ増幅器、１０……ＡＧＣ電圧生成回路、１１…
…遅延回路、１３……切換え回路。
FIG. 1 is a circuit diagram of an AGC circuit embodying the present invention, and FIG. 2 is a circuit diagram of another embodiment of the present invention. FIG. 3 is a characteristic diagram showing the effects of the present invention. FIG. 4 is a block diagram showing a configuration example of a delay type AGC circuit, and FIG. 5 is a diagram showing a conventional AGC circuit. FIG. 6 is an IF/AGC characteristic diagram, and FIG. 7 is an RF/AGC characteristic diagram. 1...Tuner, 3...RF amplifier, 7...I
F amplifier, 10...AGC voltage generation circuit, 11...
...Delay circuit, 13...Switching circuit.
Claims (1)
ユーナのＩＦ出力を増幅するＩＦ増幅器と、前記
ＩＦ増幅器を経たＩＦ信号をもとにＡＧＣ電圧を
生成するＡＧＣ電圧生成回路と、前記ＲＦ増幅器
にＡＧＣがかかり始める点のアンテナ入力信号レ
ベルが前記ＩＦ増幅器にＡＧＣがかかり始める点
のアンテナ入力信号レベルよりも高い関係になる
ように前記ＡＧＣ電圧を遅延させる遅延回路とを
有する遅延型のＡＧＣ回路において、前記遅延回
路の遅延量をチユーナの受信バンド又は受信チヤ
ンネルに応じて切換える手段を設けたことを特徴
とするＡＧＣ回路。 An RF amplifier of a television tuner, an IF amplifier that amplifies the IF output of the tuner, an AGC voltage generation circuit that generates an AGC voltage based on the IF signal that has passed through the IF amplifier, and an AGC applied to the RF amplifier. and a delay circuit that delays the AGC voltage so that the antenna input signal level at the starting point is higher than the antenna input signal level at the point at which AGC starts to be applied to the IF amplifier. An AGC circuit comprising means for switching the amount of delay in the circuit according to a reception band or a reception channel of a tuner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10346387U JPS648880U (en) | 1987-07-06 | 1987-07-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10346387U JPS648880U (en) | 1987-07-06 | 1987-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS648880U true JPS648880U (en) | 1989-01-18 |
Family
ID=31334319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10346387U Pending JPS648880U (en) | 1987-07-06 | 1987-07-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS648880U (en) |
-
1987
- 1987-07-06 JP JP10346387U patent/JPS648880U/ja active Pending
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