JPH0369206A - Variable attenuator - Google Patents

Variable attenuator

Info

Publication number
JPH0369206A
JPH0369206A JP20619089A JP20619089A JPH0369206A JP H0369206 A JPH0369206 A JP H0369206A JP 20619089 A JP20619089 A JP 20619089A JP 20619089 A JP20619089 A JP 20619089A JP H0369206 A JPH0369206 A JP H0369206A
Authority
JP
Japan
Prior art keywords
current
output
voltage
variable attenuator
output terminals
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
Application number
JP20619089A
Other languages
Japanese (ja)
Inventor
Terukazu Ishibashi
石橋　輝一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC IC Microcomputer Systems Co Ltd
Original Assignee
NEC IC Microcomputer Systems Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC IC Microcomputer Systems Co Ltd filed Critical NEC IC Microcomputer Systems Co Ltd
Priority to JP20619089A priority Critical patent/JPH0369206A/en
Publication of JPH0369206A publication Critical patent/JPH0369206A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce a current to flow to an attenuating resistor and to suppress the fluctuation of an output direct current voltage by adding an additional current circuit to input a control signal and to supply a supplying current to be changed respectively to two output terminals in a variable attenuator which changes the condition of a direct current bias according to the control signal. CONSTITUTION:The variable attenuator 20 is constituted by adding the additional current circuit 22 connected to output terminals 7 and 8 and a control terminal 9. By inputting direct current signal voltages V1 and V2 from signal input terminals 1 and 2, impressing a voltage V9 to the control terminal 9 and varying currents I10 and I18 to be led in by the collectors of transistors 10 and 18, the operating resistance of diodes 5 and 6 is changed and the amplitudes of output signals V7 and V8 from the output terminals 7 and 8 can be changed. The current I10 to be led in by the transistor 10 is passed through the diodes 5 and 6 and difference, however, between currents I16 and I17 to be transistors 16 and 17 only flows to resistors 3 and 4. Then, in the resistors 3 and 4, voltage drop is reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は可変減衰器に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to variable attenuators.

〔従来の技術〕[Conventional technology]

第４図を用いて従来の可変減衰器を説明する。 A conventional variable attenuator will be explained using FIG.

可変減衰器２１は、信号入力端子１及び信号入力端子２
に任意の直流電圧Ｖｌ、Ｖ２を加え、さらに調整端子９
に与える電圧Ｖ９によって、インピーダンス可変用ダイ
オード５．６にそれぞれ流れる電流Ｉ５．Ｉ６を可変す
ることにより、前記ダイオード５．６それぞれの動作抵
抗’　５　ｒ　’ｒ　６を変化させて、信号入力端１．
２対出力端子７゜８の入出力の電圧利得を制御していた
。The variable attenuator 21 has a signal input terminal 1 and a signal input terminal 2.
Apply arbitrary DC voltages Vl and V2 to the adjustment terminal 9.
The voltage V9 applied to the impedance variable diode 5.6 causes a current I5. By varying I6, the operating resistance '5r'r6 of each of the diodes 5.6 is varied, and the signal input terminals 1.
The voltage gain of the input and output of two pairs of output terminals 7°8 was controlled.

しかしこの回路２１は調整端子に与えられる電圧Ｖ９に
よって変化するダイオード５，６を流れる電流Ｉ５．Ｉ
６によって、抵抗３．抵抗４に電圧効果を生じ、出力端
子７．８の直流電圧■７■８が変動する為トランジスタ
１０のコレクタの電位Ｖ。がトランジスタ１０の動作に
支障の無い範囲での調整を行なう。However, in this circuit 21, the current I5. I
6, resistor 3. A voltage effect occurs in the resistor 4, and the DC voltage 7.8 of the output terminal 7.8 fluctuates, so the potential V of the collector of the transistor 10. The adjustment is made within a range that does not interfere with the operation of the transistor 10.

又、次段に別口路を接続する場合には、その回路の入力
バイアス範囲内での可変を行ったり、出力端子７．８と
別口路の入力を直流的に遮断して使用する。In addition, when a separate port is connected to the next stage, the input bias of the circuit is varied within the range of the input bias, or the input of the output terminal 7.8 and the separate port are cut off in terms of direct current.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の可変減衰器は、出力直流電圧が変動する
為、出力端子に接続する次段の回路の入力条件によって
利得制御範囲が限られてしまうという欠点があった。The above-mentioned conventional variable attenuator has the disadvantage that the output DC voltage fluctuates, so the gain control range is limited depending on the input conditions of the next stage circuit connected to the output terminal.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の可変減衰器は、二つの直流入力信号をそれぞれ
減衰抵抗と順方向直流バイアスされている可変インピー
ダンスダイオードとにより分圧して、それぞれ二つの出
力端子に直流の減衰出力信号を出力し、制御信号により
前記直流バイアスの条件を変化させる可変減衰器におい
て、前記制御信号を入力して変化する供給電流を前記二
つの出力端子にそれぞれ供給する附加電流回路を附加し
て構成されている。The variable attenuator of the present invention divides two DC input signals using an attenuation resistor and a forward DC biased variable impedance diode, outputs DC attenuated output signals to two output terminals, and controls the voltage. The variable attenuator that changes the conditions of the DC bias according to a signal is constructed by adding an additional current circuit that inputs the control signal and supplies changing supply currents to the two output terminals, respectively.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例の回路図である。FIG. 1 is a circuit diagram of an embodiment of the present invention.

可変減衰器２０は、第２図の可変減衰回路２１に、その
出力端子７，８と制御端子９に接続する附加電流回路２
２を附加して構成されている。The variable attenuator 20 includes an additional current circuit 2 connected to the variable attenuation circuit 21 shown in FIG.
It is constructed by adding 2.

第２図の従来例の動作と同様に、信号入力端子１．２よ
り直流の信号電圧Ｖ、、Ｖ２を入力し、制御端子９に電
圧Ｖ９を印加し、トランジスタ１０．１８のコレクタが
引き込む電流１１０，１１８を可変する事によりダイオ
ード５．６の動作抵抗が変化し、出力端子７，８の出力
信号Ｖ、、Ｖ８の振幅を変える事ができる。Similar to the operation of the conventional example shown in FIG. By varying 110 and 118, the operating resistance of the diode 5.6 changes, and the amplitude of the output signals V, V8 at the output terminals 7 and 8 can be changed.

ここでトランジスタ１８が引き込む電流Ｉ＋８をトラン
ジスタ１５．抵抗１２に流し、抵抗１２゜１３．１４の
抵抗値の比及びトランジスタ１５゜１６．１７のエミッ
タサイズ比を任意に設定する事により、Ｉ・ランジスタ
１６，１７のコレクタの吐き出す電流■１６＋Ｉ１７を
決定する。Here, the current I+8 drawn by transistor 18 is transferred to transistor 15. By flowing the current through the resistor 12 and arbitrarily setting the resistance value ratio of the resistor 12゜13.14 and the emitter size ratio of the transistor 15゜16.17, the current discharged from the collectors of the I transistors 16 and 17 ■16 + I17 is determined. do.

トランジスタ１０が引き込む電流１１０はダイオード５
，６を通るが、トランジスタ１６．１７がら供給される
電流１１６，１１７どの差が抵抗３，４に流れるだけで
、抵抗３，４における電圧降下が低減する。The current 110 drawn by the transistor 10 flows through the diode 5.
, 6, but only the difference in currents 116, 117 supplied from transistors 16, 17 flows through resistors 3, 4, reducing the voltage drop across resistors 3, 4.

又、特にトランジスタ１０の引き込み電流１１０の１／
２の電流をトランジスタ１６．１７から供給すれば、抵
抗３，４に流れる電流は零となり、出力端子７，８の出
力直流電圧Ｖ７．ＶＢは制御端子９の電圧Ｖｏ、すなわ
ち減衰量に無関係で信号入力端子１．２と同じ直流電圧
Ｖ　１　、　Ｖ　２に一定とすることができる。Also, in particular, 1/1 of the draw current 110 of the transistor 10
2 is supplied from transistors 16.17, the current flowing through resistors 3 and 4 becomes zero, and the output DC voltage V7. VB is independent of the voltage Vo of the control terminal 9, that is, the amount of attenuation, and can be kept constant at the same DC voltages V 1 and V 2 as the signal input terminals 1.2.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、制御端子によって制御さ
れる電流と連動する電流源を出力端子に付加し、減衰抵
抗に流れる電流を低減し、出力直流電圧の変動を抑える
効果がある。As described above, the present invention has the effect of adding a current source to the output terminal that is linked to the current controlled by the control terminal, reducing the current flowing through the damping resistor, and suppressing fluctuations in the output DC voltage.

ランジスタ、１８・・・ＮＰＮ　トランジスタ、２０・
・・可変減衰器、２１・・・可変減衰回路、２２・・・
附加電流回路。Transistor, 18...NPN transistor, 20...
...Variable attenuator, 21...Variable attenuation circuit, 22...
Additional current circuit.

Claims (1)

【特許請求の範囲】[Claims] 　二つの直流入力信号をそれぞれ減衰抵抗と順方向直流
バイアスされている可変インピーダンスダイオードとに
より分圧して、それぞれ二つの出力端子に直流の減衰出
力信号を出力し、制御信号により前記直流バイアスの条
件を変化させる可変減衰器において、前記制御信号を入
力して変化する供給電流を前記二つの出力端子にそれぞ
れ供給する附加電流回路を附加したことを特徴とする可
変減衰器。Two DC input signals are divided by an attenuation resistor and a forward DC biased variable impedance diode, DC attenuated output signals are output to two output terminals, and the DC bias condition is controlled by a control signal. 2. A variable attenuator for changing the attenuator, characterized in that an additional current circuit is added for inputting the control signal and supplying changing supply currents to the two output terminals, respectively.
JP20619089A 1989-08-08 1989-08-08 Variable attenuator Pending JPH0369206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20619089A JPH0369206A (en) 1989-08-08 1989-08-08 Variable attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20619089A JPH0369206A (en) 1989-08-08 1989-08-08 Variable attenuator

Publications (1)

Publication Number Publication Date
JPH0369206A true JPH0369206A (en) 1991-03-25

Family

ID=16519300

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20619089A Pending JPH0369206A (en) 1989-08-08 1989-08-08 Variable attenuator

Country Status (1)

Country Link
JP (1) JPH0369206A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247221B2 (en) * 1979-05-01 1987-10-07 Asahi Chemical Ind

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6247221B2 (en) * 1979-05-01 1987-10-07 Asahi Chemical Ind

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