JPS59216311A - Variable resistance attenuator - Google Patents
Variable resistance attenuatorInfo
- Publication number
- JPS59216311A JPS59216311A JP9183483A JP9183483A JPS59216311A JP S59216311 A JPS59216311 A JP S59216311A JP 9183483 A JP9183483 A JP 9183483A JP 9183483 A JP9183483 A JP 9183483A JP S59216311 A JPS59216311 A JP S59216311A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- pin diodes
- input
- attenuator
- pin
- 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
- 239000003990 capacitor Substances 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/24—Frequency- independent attenuators
- H03H7/25—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable
- H03H7/253—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable the element being a diode
- H03H7/255—Frequency- independent attenuators comprising an element controlled by an electric or magnetic variable the element being a diode the element being a PIN diode
Landscapes
- Attenuators (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発Ｆ３Ａは、高周波・広帯域信号のＡＧｃ回路などに
使用するピン（ＰＩＮ）ダイオードを用いた集中定数形
入出力インピーダンス一定の可変抵抗減衰器に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This F3A relates to a variable resistance attenuator with a lumped constant type input/output impedance constant using a PIN diode used in AGc circuits for high frequency/wideband signals, etc. It is.
従来例の構成とその問題点
第１図は従来の可変減衰器を示している。以下にこの従
来例の構成について第１図とともに説明する。第１図に
おいて、１は信号入力端、２は信号出力端、３は正電源
端、４は制御電圧入力端、５〜７は接地端、８〜９は抵
抗器、１０〜１４はコンデンサ、１５はコイル、１６〜
１８はピンダイオードを示す。Structure of the conventional example and its problems FIG. 1 shows a conventional variable attenuator. The configuration of this conventional example will be explained below with reference to FIG. 1. In FIG. 1, 1 is a signal input terminal, 2 is a signal output terminal, 3 is a positive power supply terminal, 4 is a control voltage input terminal, 5 to 7 are ground terminals, 8 to 9 are resistors, 10 to 14 are capacitors, 15 is a coil, 16~
18 indicates a pin diode.
次に上記従来例の動作について説明する。第１図におい
て、ピンダイオード１６〜１８はバイアス電流によって
抵抗値の変化する純抵抗吉見なぜるので、一定周波数以
上ではピンダイオード１６〜Ｉ８から成るπ形抵抗減衰
器が形成されている。Next, the operation of the above conventional example will be explained. In FIG. 1, since the pin diodes 16 to 18 are pure resistance Yoshimi whose resistance value changes depending on the bias current, a π-type resistance attenuator consisting of the pin diodes 16 to I8 is formed above a certain frequency.
抵抗８及び９の値を適切に設定すれば、制御電圧入力端
４に加える電圧によってピンダイオード１６〜１Ｂに流
れる電流を変化させ、信号入力端１と信号出力端２０間
での減衰量を可変とするこ１とができる。By appropriately setting the values of the resistors 8 and 9, the current flowing through the pin diodes 16 to 1B can be changed depending on the voltage applied to the control voltage input terminal 4, and the amount of attenuation between the signal input terminal 1 and the signal output terminal 20 can be varied. It is possible to do the following.
しかしながら、上記従来例においては、ピンダイオード
１８に流れる電流とピンダイオード１６及び１７に流れ
る電流とを、抵抗８及び抵抗９の値を設定するだけで設
計値通りに制御することが難しく、広い減衰量範囲にわ
たって入出力インピーダンスを一定に保つことが出来な
い欠点がちった。However, in the above conventional example, it is difficult to control the current flowing through the pin diode 18 and the current flowing through the pin diodes 16 and 17 according to the designed values simply by setting the values of the resistors 8 and 9. The drawback was that the input and output impedance could not be kept constant over a range of quantities.
発明の目的
本発明は、上記従来例の欠点を除去するものであり、広
い可変減衰量範囲にわたって入出力インピーダンス特性
を一定に保つことを目的とするものである。OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the conventional example described above, and aims to maintain input/output impedance characteristics constant over a wide variable attenuation range.
発明の構成
本発明は、上記目的を達成するために、各ピンダイオー
ドを交流結合した上で各々に電圧制御形電流源を設けて
バイアス電流を独立に変えられるようにし、入力制御電
圧とそれを非線形回路によって変換した制御電圧とで電
流源を駆動するもので、非線形回路の特性をπ形減衰器
の２種類の抵抗値変化に対応したピンダイオードの特性
に近似させることによって、入出力インピーダンスを一
定にする効果を得るものである。Structure of the Invention In order to achieve the above object, the present invention connects each pin diode with AC and provides each with a voltage-controlled current source so that the bias current can be changed independently. The current source is driven by a control voltage converted by a nonlinear circuit.By approximating the characteristics of the nonlinear circuit to those of a pin diode that corresponds to two types of resistance value changes in a π-type attenuator, the input/output impedance can be reduced. This has the effect of making it constant.
実施例の説明
以下に本発明の一実施例の構成について、図面とともに
説明する。第２図において、２１は信号入力端、２２は
信号出力端、２３は制御電圧入力端、２４．２５ｆｄ接
地端、２６〜３１はコンデンサ、３２〜３４はピンダイ
オード、３５〜３７は電圧制御形電流源、３８は非線形
回路を示している。DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. In Fig. 2, 21 is a signal input terminal, 22 is a signal output terminal, 23 is a control voltage input terminal, 24.25fd ground terminal, 26 to 31 are capacitors, 32 to 34 are pin diodes, and 35 to 37 are voltage control type terminals. A current source 38 indicates a nonlinear circuit.
次に上記実施例の動作について説明する。第２図におい
て、各ピンダイオード３２〜３４／−ｉ、コンデンサ２
６〜３１によって交流結合されており、π形抵抗減衰回
路を構成している。各ピンダイオード３２〜３４にはそ
れぞれ電圧制御形電流源３５〜３７が設けられ、制御電
圧によって各々独立にバイアス電流を設定できる。電圧
制御形電流源３５及び３６は、制御電圧入力端２３へ入
力した電圧を非線形回路３８で変換された電圧によって
駆動され名。本実施例では、−例として電圧制御形電流
源３５〜３７には演算増幅器を、非線形回路３８にはダ
イオードの折線近似回路を用いることにより比較的簡易
に回路を構成することが出来、減衰量の可変増幅の広い
、入出力インピーダンスが一定の減衰器が実現できる。Next, the operation of the above embodiment will be explained. In Figure 2, each pin diode 32 to 34/-i, capacitor 2
6 to 31, and constitute a π-type resistance attenuation circuit. Each of the pin diodes 32 to 34 is provided with a voltage-controlled current source 35 to 37, respectively, and a bias current can be set independently using a control voltage. The voltage controlled current sources 35 and 36 are driven by a voltage obtained by converting the voltage input to the control voltage input terminal 23 by a nonlinear circuit 38. In this embodiment, by using operational amplifiers for the voltage-controlled current sources 35 to 37 and a diode line approximation circuit for the nonlinear circuit 38, the circuit can be constructed relatively easily, and the attenuation amount An attenuator with a wide range of variable amplification and constant input/output impedance can be realized.
寸だ本発明はπ形抵抗減衰器だけでなく、ブリッジドＴ
形抵抗減衰器などにも適用することができるものである
。The present invention is applicable not only to π-type resistive attenuators but also to bridged T-type resistor attenuators.
It can also be applied to type resistor attenuators.
発明の効果
本発明は上記のような構成であり、以下に示す効果が得
られるものである。Effects of the Invention The present invention has the above-described configuration, and provides the following effects.
（ａ） 各ピンダイオードに独立に電圧制御形電流源
を設けているので、バイアス電流値を任意に設定できる
。(a) Since each pin diode is provided with an independent voltage-controlled current source, the bias current value can be set arbitrarily.
（ｂ） 非線形回路の特性から、ピンダイオード抵抗
値の変化を理想的に行うことが出来るので、抵抗減衰器
の入出力インピーダンスを一定に保つととＫよって良好
な高周波特性が得られる。(b) Since it is possible to ideally change the pin diode resistance value from the characteristics of the nonlinear circuit, good high frequency characteristics can be obtained by keeping the input and output impedance of the resistive attenuator constant.
図は本発明の一実施例における可変抵抗減衰器の電気回
路図である。The figure is an electrical circuit diagram of a variable resistance attenuator in one embodiment of the present invention.
２１・・・信号入力端、２２・・・信号出力端、２３・
・・制御電圧入力端、２４．２５・・接地端、２６〜３
■・・・コンデンサ、３２〜３４・・・ピンダイオード
、３５〜３７・・電圧制御形電流源、３８・・・非線形
回路。21...Signal input end, 22...Signal output end, 23.
・・Control voltage input terminal, 24.25 ・・Ground terminal, 26~3
■... Capacitor, 32-34... Pin diode, 35-37... Voltage controlled current source, 38... Non-linear circuit.
Claims (1)
衰回路と、各ピンダイオードに独立にバイアス電流を流
す電圧制御形電流源と、上記電圧制御形電流源に与える
電圧を、減衰量を制御する制御電圧から変換する非線形
回路とからなる可変抵抗減衰器。A resistance attenuation circuit consisting of a plurality of AC-coupled pin diodes, a voltage-controlled current source that flows a bias current independently to each pin diode, and a control that controls the amount of attenuation of the voltage applied to the voltage-controlled current source. A variable resistance attenuator consisting of a nonlinear circuit that converts from voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9183483A JPS59216311A (en) | 1983-05-24 | 1983-05-24 | Variable resistance attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9183483A JPS59216311A (en) | 1983-05-24 | 1983-05-24 | Variable resistance attenuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59216311A true JPS59216311A (en) | 1984-12-06 |
Family
ID=14037620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9183483A Pending JPS59216311A (en) | 1983-05-24 | 1983-05-24 | Variable resistance attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59216311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942375A (en) * | 1987-06-30 | 1990-07-17 | U.S. Philips Corporation | Variable attenuation device intended to be inserted between a transmitter circuit and load circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5442959A (en) * | 1977-08-19 | 1979-04-05 | Nec Corp | Variable resistance attenuator |
-
1983
- 1983-05-24 JP JP9183483A patent/JPS59216311A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5442959A (en) * | 1977-08-19 | 1979-04-05 | Nec Corp | Variable resistance attenuator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942375A (en) * | 1987-06-30 | 1990-07-17 | U.S. Philips Corporation | Variable attenuation device intended to be inserted between a transmitter circuit and load circuit |
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