JPS6163116A - Variable attenuator - Google Patents
Variable attenuatorInfo
- Publication number
- JPS6163116A JPS6163116A JP18525684A JP18525684A JPS6163116A JP S6163116 A JPS6163116 A JP S6163116A JP 18525684 A JP18525684 A JP 18525684A JP 18525684 A JP18525684 A JP 18525684A JP S6163116 A JPS6163116 A JP S6163116A
- Authority
- JP
- Japan
- Prior art keywords
- inputted
- signal
- converter
- analog signal
- digital 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
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ＰＣＭ端局装置等に使用する可変減衰器に係
り、減衰量を電気信号により可変出来る可変減衰器に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable attenuator used in a PCM terminal station, etc., and more particularly, to a variable attenuator whose attenuation amount can be varied by an electrical signal.
ディジタル通信網が多様化高度化するにつれて柔軟性の
あるＰＣＭ伝送の需要が高まっている。As digital communication networks become more diverse and sophisticated, the demand for flexible PCM transmission is increasing.
それに伴い、ＰＣＭ端局装置を個々に管理運用するので
なく多くのＰＣＭ端局装置をまとめて管理する集中管理
型のシステムが要求されている。Accordingly, there is a need for a centralized management system that manages many PCM terminal devices collectively instead of managing and operating the PCM terminal devices individually.
その為にはＰＣＭ端局装置の各機能に対して電気信号に
よる消隔制御が必要になって（る。For this purpose, it is necessary to perform isolation control using electrical signals for each function of the PCM terminal equipment.
又装置の各構成部品は電気信号での制御が可能であるば
かりでなく省スペース化等の要求も満たさなければなら
ない。In addition, each component of the device must not only be controllable by electrical signals, but must also satisfy requirements such as space saving.
従って可変減衰器に就いでも小形で電気信号で可変出来
るものが要望されている。Therefore, there is a demand for a variable attenuator that is small and can be varied by electrical signals.
〔従来の技術と発明が解決しようとする問題点〕第２図
は従来例の可変減衰器の回路図である。[Prior art and problems to be solved by the invention] FIG. 2 is a circuit diagram of a conventional variable attenuator.
図中１は厚膜抵抗アレイで構成された減衰器群を示し、
２．２−１〜２−１Ｏは切り替え端子を示す。1 in the figure shows an attenuator group composed of a thick film resistor array,
2.2-1 to 2-1O indicate switching terminals.
第２図に示す、厚膜抵抗アレイで構成された減衰器群１
と切り替え端子２．２−１〜２−１０で構成された従来
の可変減衰器は、小形であるが、減衰量を変化させるに
は、切り替え端子２，２−１〜２−１０の所定の個所を
切断又は接続することで行わねばならず電気信号により
可変出来ない問題点がある。Attenuator group 1 consisting of a thick film resistor array shown in Fig. 2
A conventional variable attenuator configured with switching terminals 2.2-1 to 2-10 is small, but in order to change the amount of attenuation, it is necessary to This has to be done by cutting or connecting parts, and there is a problem that it cannot be changed by electrical signals.
上記問題点は、ディジタル・アナログ変換器の基準電圧
入力端子にアナログ信号を入力し、ディジタル信号によ
り、このディジタル・アナログ変換器の抵抗列の組合せ
を変えることにより該アナログ信号を任意のレベル迄減
衰させるようにした本発明の可変減衰器により解決され
る。The above problem can be solved by inputting an analog signal to the reference voltage input terminal of the digital-to-analog converter, and using the digital signal to attenuate the analog signal to an arbitrary level by changing the combination of the resistor strings of this digital-to-analog converter. This problem is solved by the variable attenuator of the present invention.
本発明は、ディジタル・アナログ変換器（以下Ｄ／Ａ変
換器と称す）が、入力されたディジタル信号により、抵
抗列の組合せを変えることにより基準電圧に重み付けを
し、アナログ信号として出力する動作を利用し、基準電
圧入力端子よりアナログ信号を入力し、ディジタル信号
により、該抵抗列の組合せを変え、このアナログ信号を
任意のレベル迄減衰させ出力させるようにしたも、ので
ある。The present invention provides an operation in which a digital-to-analog converter (hereinafter referred to as a D/A converter) weights a reference voltage by changing the combination of resistor strings according to an input digital signal, and outputs it as an analog signal. In this case, an analog signal is inputted from a reference voltage input terminal, and the combination of the resistor strings is changed using a digital signal, and this analog signal is attenuated to an arbitrary level and output.
従って電気信号により減衰量を可変出来又このＤ／Ａ変
換器はり一ドレス・チップキャリアＩＣにて構成が可能
であるので非常に小形化出来る。Therefore, the amount of attenuation can be varied by an electric signal, and since this D/A converter can be constructed using a single-layer chip carrier IC, it can be made extremely compact.
第１図は本発明の実施例のの可変減衰器の構成を示すブ
ロック図である。FIG. 1 is a block diagram showing the configuration of a variable attenuator according to an embodiment of the present invention.
図中３はＤ／Ａ変換器、４はデータラッチ部、５は抵抗
列、６はオペアンプ、ＳＷＩ〜ＳＷＮはスイッチを示す
。In the figure, 3 is a D/A converter, 4 is a data latch section, 5 is a resistor string, 6 is an operational amplifier, and SWI to SWN are switches.
第１図では、Ｄ／Ａ変換器３の基準電圧入力端子Ｖｒｅ
ｆにアナログ信号を入力し、ディジタル信号入力部より
、例えば８ビツトのディジタル信号を入力し、データラ
ッチ部４にてチッチさせ、このラッチされたデータの値
により、スイッチＳＷＩ〜ＳＷＮの内所定のスイッチを
切り替え、抵抗列５の組合せを変えることにより、バイ
ナリ−に重みづけされた電流量を制御して減衰量を変化
させ、減衰されたアナログ信号を出力端子ＯＵＴよりオ
ペアンプ６に入力し、電圧量に変換して出力する。In FIG. 1, the reference voltage input terminal Vre of the D/A converter 3
An analog signal is input to f, and an 8-bit digital signal, for example, is input from the digital signal input section, and the data latch section 4 latches the data. By switching the switch and changing the combination of the resistor strings 5, the amount of attenuation is changed by controlling the binary weighted current amount, and the attenuated analog signal is input to the operational amplifier 6 from the output terminal OUT, and the voltage is Convert to quantity and output.
尚オペアンプ６はスイッチ５ＷＩ−３ＷＮを全部点線側
に切り替えた時スルー状態を実現するように基準量を補
正する。Note that the operational amplifier 6 corrects the reference amount so that a through state is realized when all the switches 5WI-3WN are switched to the dotted line side.
このようにすると、電気信号により減衰量が可変出来又
入力信号と出力信号に関しＡＣ特性の劣化がなく尚又Ｄ
／Ａ変換器３はリードレス・チップキャリアＩＣにて構
成が可能であるので非常に小形化出来る。In this way, the amount of attenuation can be varied by the electric signal, and there is no deterioration of the AC characteristics of the input signal and output signal, and the D
Since the /A converter 3 can be constructed using a leadless chip carrier IC, it can be made extremely compact.
今回８ビツトのＤ／Ａ変換器を使用し０〜１６ｄｂ、可
変ステップ０．５ｄｂの可変減衰器を作り、ＰＣＭ端局
装置に実装し、伝送特性を測定したところ、ＰＣＭ端局
装置の規格に対し良好な特性を得た。This time, we used an 8-bit D/A converter to create a variable attenuator from 0 to 16 db with variable steps of 0.5 db, mounted it on a PCM terminal equipment, measured the transmission characteristics, and found that it met the standard for PCM terminal equipment. However, good characteristics were obtained.
以上詳細に説明せる如（本発明によれば、小形で、電気
信号で減衰量を可変出来る可変減衰器が得られる効果が
ある。As described in detail above, the present invention has the advantage of providing a small variable attenuator that is capable of varying the amount of attenuation using an electrical signal.
第１図は本発明の実施例のの可変減衰器の構成を示すブ
ロック図、
第２図は従来例の可変減衰器の回路図である。
図において、
１は減衰器群、
２．２−１〜１−１０は切り替え端子、３はディジタル
・アナログ変換器、
４はデータランチ部、
５は抵抗列、
６はオペアンプ、
ＳＷＩ〜ＳＷＮはスイッチを示す。FIG. 1 is a block diagram showing the configuration of a variable attenuator according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional variable attenuator. In the figure, 1 is an attenuator group, 2.2-1 to 1-10 are switching terminals, 3 is a digital-to-analog converter, 4 is a data launch section, 5 is a resistor string, 6 is an operational amplifier, and SWI to SWN are switches shows.
Claims (1)
ログ信号を入力し、ディジタル信号により、このディジ
タル・アナログ変換器の抵抗列の組合せを変えることに
より該アナログ信号を任意のレベル迄減衰させるように
したことを特徴とする可変減衰器。An analog signal is input to the reference voltage input terminal of a digital-to-analog converter, and the analog signal is attenuated to an arbitrary level by changing the combination of resistors in the digital-to-analog converter using the digital signal. A variable attenuator featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18525684A JPS6163116A (en) | 1984-09-04 | 1984-09-04 | Variable attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18525684A JPS6163116A (en) | 1984-09-04 | 1984-09-04 | Variable attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6163116A true JPS6163116A (en) | 1986-04-01 |
Family
ID=16167630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18525684A Pending JPS6163116A (en) | 1984-09-04 | 1984-09-04 | Variable attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6163116A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0635770U (en) * | 1992-10-14 | 1994-05-13 | 協成設備工業株式会社 | Pipe materials such as construction and civil engineering formwork |
-
1984
- 1984-09-04 JP JP18525684A patent/JPS6163116A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0635770U (en) * | 1992-10-14 | 1994-05-13 | 協成設備工業株式会社 | Pipe materials such as construction and civil engineering formwork |
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