JPS6378420U - - Google Patents
Info
- Publication number
- JPS6378420U JPS6378420U JP17278386U JP17278386U JPS6378420U JP S6378420 U JPS6378420 U JP S6378420U JP 17278386 U JP17278386 U JP 17278386U JP 17278386 U JP17278386 U JP 17278386U JP S6378420 U JPS6378420 U JP S6378420U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- supplied
- differential
- bipolar element
- active state
- 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
- 239000002131 composite material Substances 0.000 claims 1
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Description
第１図乃至第３図は共にこの考案に係るプログ
ラマブル・アツテネータ回路の一実施例を示すも
ので、第１図は同実施例の基本構成を示すブロツ
ク回路図、第２図は同実施例に用いられるスイツ
チ回路の基本回路構成図、第３図は同スイツチ回
路の具体的な構成を示す回路図、第４図は従来の
プログラマブル・アツテネータ回路の構成を示す
回路図、第５図は従来回路に用いられるスイツチ
回路の構成を示す回路図、第６図は同スイツチ回
路の動作特性を説明するための図である。
Ａ〜Ｄ…コントロール信号、Ｓ１〜Ｓ４，Ｓ１
１〜Ｓ１４…ＣＭＯＳ型アナログスイツチ回路、
Ｒ１〜Ｒ４，Ｒ１１〜Ｒ１４…ラダー抵抗、Ｓ２
１〜Ｓ２４…バイポーラ型アナログスイツチ回路
、Ｑ１〜Ｑ１０…バイポーラトランジスタ、Ｄ１
〜Ｄ４…定電圧ダイオード、Ｉ０…定電流源、Ｂ
Ａ…バツフアアンプ。
1 to 3 each show an embodiment of the programmable attenuator circuit according to this invention. FIG. 1 is a block circuit diagram showing the basic configuration of the embodiment, and FIG. 2 is a block circuit diagram showing the basic configuration of the embodiment. The basic circuit configuration diagram of the switch circuit used, Figure 3 is a circuit diagram showing the specific configuration of the switch circuit, Figure 4 is a circuit diagram showing the configuration of a conventional programmable attenuator circuit, and Figure 5 is a conventional circuit. FIG. 6 is a circuit diagram showing the configuration of a switch circuit used in the present invention, and FIG. 6 is a diagram for explaining the operating characteristics of the switch circuit. A to D...control signal, S1 to S4, S1
1 to S14...CMOS type analog switch circuit,
R1~R4, R11~R14...Ladder resistance, S2
1 to S24... Bipolar analog switch circuit, Q1 to Q10... Bipolar transistor, D1
~D4... Constant voltage diode, I0... Constant current source, B
A...batshua amp.
Claims (1)
にそれぞれビツトデータで導通状態、非導通状態
に切換制御可能なスイツチ回路を設け、各スイツ
チ回路で導出されたオーデイオ信号をそれぞれ複
数系統間に設けられるラダー抵抗によつて合成出
力するもので、前記各系統のビツトデータに応じ
て前記ラダー抵抗による減衰量を調整するプログ
ラマブル・アツテネータ回路において、前記系統
別に設けられるスイツチ回路を、活性状態で入力
端に供給される入力信号を導出するバイポーラ素
子でなる第１の差動回路と、活性状態で出力端を
短絡するバイポーラ素子でなる第２の差動回路と
、前記第１及び第２の差動回路の駆動電流をコン
トロール信号に応じて供給状態、非供給状態にし
て一方が活性状態、他方が非活性状態となるよう
に切換制御するバイポーラ素子でなる切換回路と
を具備して構成したことを特徴とするプログラマ
ブル・アツテネータ回路。 The audio signal is branched into multiple systems, and each system is provided with a switch circuit that can be controlled to be in a conductive state or non-conductive state using bit data. In a programmable attenuator circuit that outputs a composite signal using a resistor and adjusts the amount of attenuation by the ladder resistor according to the bit data of each system, a switch circuit provided for each system is supplied to the input terminal in an active state. a first differential circuit made of a bipolar element that derives an input signal to be input, a second differential circuit made of a bipolar element that shorts the output terminal in an active state, and a first differential circuit of the first and second differential circuits. A switching circuit made of a bipolar element that switches and controls the drive current to be supplied or not supplied in accordance with a control signal so that one is in an active state and the other is in an inactive state. programmable attenuator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17278386U JPS6378420U (en) | 1986-11-11 | 1986-11-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17278386U JPS6378420U (en) | 1986-11-11 | 1986-11-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6378420U true JPS6378420U (en) | 1988-05-24 |
Family
ID=31109634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17278386U Pending JPS6378420U (en) | 1986-11-11 | 1986-11-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6378420U (en) |
-
1986
- 1986-11-11 JP JP17278386U patent/JPS6378420U/ja active Pending
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