JPS61191618U - - Google Patents
Info
- Publication number
- JPS61191618U JPS61191618U JP7624185U JP7624185U JPS61191618U JP S61191618 U JPS61191618 U JP S61191618U JP 7624185 U JP7624185 U JP 7624185U JP 7624185 U JP7624185 U JP 7624185U JP S61191618 U JPS61191618 U JP S61191618U
- Authority
- JP
- Japan
- Prior art keywords
- gain control
- automatic gain
- variable capacitance
- capacitance diode
- 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
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Control Of Amplification And Gain Control (AREA)
Description
第１図は、本考案のＡＧＣ回路の一実施例の回
路図であり、第２図は、第１図で利用される可変
容量ダイオードの容量の変化を説明する特性図で
あり、第３図は、第１図のＡＧＣ回路の利得特性
図であり、第４図は、従来のＡＧＣ回路の一例の
回路図であり、第５図は、従来のＡＧＣ回路の他
の一例の回路図であり、第６図は、第４図および
第５図に示す従来のＡＧＣ回路の利得特性図であ
る。
１：アンテナ端子、２：入力同調回路、６：Ａ
ＧＣ端子、２０：制御回路、２２：可変容量ダイ
オード。
FIG. 1 is a circuit diagram of one embodiment of the AGC circuit of the present invention, FIG. 2 is a characteristic diagram illustrating changes in capacitance of the variable capacitance diode used in FIG. 1, and FIG. is a gain characteristic diagram of the AGC circuit of FIG. 1, FIG. 4 is a circuit diagram of an example of the conventional AGC circuit, and FIG. 5 is a circuit diagram of another example of the conventional AGC circuit. , FIG. 6 is a gain characteristic diagram of the conventional AGC circuit shown in FIGS. 4 and 5. 1: Antenna terminal, 2: Input tuning circuit, 6: A
GC terminal, 20: control circuit, 22: variable capacitance diode.
Claims (1)
との間に可変容量ダイオードを介装させ、この可
変容量ダイオードに自動利得制御信号を与えて、
強いアンテナ信号が入来した際に前記可変容量ダ
イオードの容量が小さくなるように構成したこと
を特徴とする自動利得制御回路。 A variable capacitance diode is interposed between the tank circuit forming the input tuning circuit and the antenna, and an automatic gain control signal is applied to the variable capacitance diode.
An automatic gain control circuit characterized in that the automatic gain control circuit is configured such that the capacitance of the variable capacitance diode becomes small when a strong antenna signal enters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7624185U JPS61191618U (en) | 1985-05-22 | 1985-05-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7624185U JPS61191618U (en) | 1985-05-22 | 1985-05-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61191618U true JPS61191618U (en) | 1986-11-28 |
Family
ID=30618206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7624185U Pending JPS61191618U (en) | 1985-05-22 | 1985-05-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61191618U (en) |
-
1985
- 1985-05-22 JP JP7624185U patent/JPS61191618U/ja active Pending
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