JPS586422U - variable attenuation circuit - Google Patents
variable attenuation circuitInfo
- Publication number
- JPS586422U JPS586422U JP9897581U JP9897581U JPS586422U JP S586422 U JPS586422 U JP S586422U JP 9897581 U JP9897581 U JP 9897581U JP 9897581 U JP9897581 U JP 9897581U JP S586422 U JPS586422 U JP S586422U
- Authority
- JP
- Japan
- Prior art keywords
- variable
- variable attenuation
- attenuator
- attenuation circuit
- attenuation
- 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
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図は従来の可変減衰回路の例を示すブ寵ツク図、第
２図は第１図の回路のノイズ特性を示す図、第３図は本
考案の実施例の回路図、第４図は第３図の回路のノイズ
特性を示す図、第５図は本考案の他の実施例の回路図で
ある。
主要部分の符号の説明、１・・・・・・ＶＣＡ、２・・
・・・・バッファ、３・・・・・・アッテネータ、Ｑ□
・・・・・・ＦＥＴ。
Ｒ１，Ｒ２・・・・・・減衰用抵抗。Figure 1 is a book diagram showing an example of a conventional variable attenuation circuit, Figure 2 is a diagram showing the noise characteristics of the circuit in Figure 1, Figure 3 is a circuit diagram of an embodiment of the present invention, and Figure 4. is a diagram showing the noise characteristics of the circuit of FIG. 3, and FIG. 5 is a circuit diagram of another embodiment of the present invention. Explanation of symbols of main parts, 1...VCA, 2...
...Buffer, 3...Attenuator, Q□
...FET. R1, R2... Attenuation resistance.
Claims (3)
して次段へ送出するようにした可変減衰回路であって、
前記電圧制御可変減衰手段の減衰量が所定値以上になっ
たときに動作して前記バッファ手段の出力を減衰せしめ
る他の減衰器を有してなることを特徴とする可変減衰回
路。(1) A variable attenuation circuit configured to send the output of the voltage-controlled variable attenuation means to the next stage via a buffer means,
A variable attenuation circuit characterized by comprising another attenuator that operates to attenuate the output of the buffer means when the amount of attenuation of the voltage controlled variable attenuation means exceeds a predetermined value.
より制御される可変インピーダンス素子を有し、この可
変インピーダンス素子により前記バッファ手段の出力を
減衰するようにしたことを特徴とする実用新案登録請求
の範囲第１項記載の可変減衰回路。(2) A utility model characterized in that the other attenuator has a variable impedance element controlled by the control voltage of the variable attenuation means, and the variable impedance element attenuates the output of the buffer means. A variable attenuation circuit according to claim 1.
変減衰手段の減衰量が所定値具−りになったとき前記抵
抗減衰器を動作せしめるよう構成されていることを特徴
とする実用新案登録請求の範囲第１項記載の可変減衰回
路。(3) The other attenuator has a resistive attenuator configuration, and is configured to operate the resistive attenuator when the amount of attenuation of the variable attenuator reaches a predetermined value. A variable attenuation circuit according to claim 1 of the utility model registration claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9897581U JPS586422U (en) | 1981-07-01 | 1981-07-01 | variable attenuation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9897581U JPS586422U (en) | 1981-07-01 | 1981-07-01 | variable attenuation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS586422U true JPS586422U (en) | 1983-01-17 |
Family
ID=29893722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9897581U Pending JPS586422U (en) | 1981-07-01 | 1981-07-01 | variable attenuation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS586422U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419761A (en) * | 1977-07-14 | 1979-02-14 | Nec Corp | Optical parts |
| JPS5639726B2 (en) * | 1975-06-24 | 1981-09-16 |
-
1981
- 1981-07-01 JP JP9897581U patent/JPS586422U/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5639726B2 (en) * | 1975-06-24 | 1981-09-16 | ||
| JPS5419761A (en) * | 1977-07-14 | 1979-02-14 | Nec Corp | Optical parts |
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