JPH02164124A - Diode switch - Google Patents

Diode switch

Info

Publication number
JPH02164124A
JPH02164124A JP32004188A JP32004188A JPH02164124A JP H02164124 A JPH02164124 A JP H02164124A JP 32004188 A JP32004188 A JP 32004188A JP 32004188 A JP32004188 A JP 32004188A JP H02164124 A JPH02164124 A JP H02164124A
Authority
JP
Japan
Prior art keywords
diode
high frequency
frequency signal
diodes
bias voltage
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
JP32004188A
Other languages
Japanese (ja)
Inventor
Yukio Yoshida
幸雄 吉田
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP32004188A priority Critical patent/JPH02164124A/en
Publication of JPH02164124A publication Critical patent/JPH02164124A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain a high isolation characteristic without increasing an insertion loss and an output current of a driving circuit by connecting two diodes in series between a couple of terminals receiving a bias voltage of a diode bridge in a polarity opposite to other diodes and connecting its connection middle point to ground via a capacitor. CONSTITUTION:When a bias voltage in a polarity opposite to each diode 1 of a diode bridge 2 is fed from a driving circuit 3 via a resistor 4 and a choke coil 11, the diode 1 is turned off and a diode 9 is turned on. As a result, a high loss is caused in a circuit between input and output terminals 5, 6 in terms of a high frequency signal. Since the high frequency signal leaked from the diodes is connected to ground via the diode 9 and the capacitor 10 in such a case, the transmission of the high frequency signal between the input and output terminals 5, 6 is nearly completely interrupted. Moreover, When a bias voltage is applied from the drive circuit 3 in a forward polarity to the diode 1, the diode 1 is turned on and the diode 9 is turned off, the circuit between the input and output terminals 5, 6 is low in the loss and the transmission of the high frequency signal is attained.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

この発明は、PTNダイオード等から成るダイオードブ
リッジを用いて、高周波信号をオン・オフ制御するダイ
オードスイッチに関するものである。
The present invention relates to a diode switch that controls on/off a high frequency signal using a diode bridge made of a PTN diode or the like.

【従来の技術】[Conventional technology]

第4図は例えば特開昭54−23370号公報に示され
た従来のダイオードスイッチを示す回路図であり、図に
おいて、1は例えばPINダイオードから成るダイオー
ド、2は4個のダイオード1で構成されるダイオードブ
リッジ、3はダイオードブリッジ2の一対の端子間にバ
イアス電圧を供給するドライブ回路、4はドライブ回路
3とダイオードブリッジ2の一対の端子との間に夫々接
続される限流用の抵抗、5.6はダイオードブリッジ2
の他の一対の端子に夫々接続される高周波信号の入出力
端子、7,8は入出力端子5.6とダイオードブリッジ
2の上記他の一対の端子との間に夫々接続されるり、C
カット用のコンデンサである。 次に動作について説明する。ダイオードlは順方向電圧
を印加したときは、高周波信号に対して低抵抗を示し、
逆方向電圧を印加したときは、高周波信号に対して高抵
抗を示す半導体素子である。 コンデンサ7.8は高周波信号に対して十分低いインピ
ーダンスに選ばれている。 従って、ドライブ回路3より、抵抗4を通じて、各ダイ
オード1に対して順方向電圧を印加することにより、順
方向電流を流したときは、高周波信号の入出力端子5.
6間は低損失となり、高周波信号が伝送される。また、
ドライブ回路3より、各ダイオード1に逆方向電圧を印
加したときは、入出力端子5,6間は高損失となり、高
周波信号で伝送されない。このようにして高周波信号が
オン、オフ制御される。
FIG. 4 is a circuit diagram showing a conventional diode switch disclosed in, for example, Japanese Unexamined Patent Publication No. 54-23370. 3 is a drive circuit that supplies a bias voltage between a pair of terminals of the diode bridge 2; 4 is a current-limiting resistor connected between the drive circuit 3 and the pair of terminals of the diode bridge 2; 5; .6 is diode bridge 2
High-frequency signal input/output terminals 7 and 8 are connected between the input/output terminal 5.6 and the other pair of terminals of the diode bridge 2, respectively.
This is a capacitor for cutting. Next, the operation will be explained. Diode l exhibits low resistance to high frequency signals when forward voltage is applied,
The semiconductor element exhibits high resistance to high frequency signals when a reverse voltage is applied. The capacitors 7.8 are selected to have sufficiently low impedance for high frequency signals. Therefore, when a forward current is caused to flow by applying a forward voltage to each diode 1 from the drive circuit 3 through the resistor 4, the high frequency signal input/output terminal 5.
6, the loss is low and high frequency signals are transmitted. Also,
When a reverse voltage is applied to each diode 1 from the drive circuit 3, a high loss occurs between the input and output terminals 5 and 6, and a high frequency signal is not transmitted. In this way, the high frequency signal is controlled on and off.

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

従来のダイオードスイッチは、以上のように構成されて
いるので、高周波信号の漏れをなくすために、高アイソ
レーシヨン特性が必要な場合には、別のダイオードブリ
ッジを高周波信号回路と直列、又は高周波信号回路とア
ース間に追加する必要があり、このため入出力端子5,
6間の挿入損失が増加すると共に、ドライブ回路3の出
力電流が増加する等の問題点があった。 この発明は上記のような問題点を解消するためになされ
たもので、高周波信号の入出力端子間の挿入損失の増加
、及びドライブ回路の出力電流の増加を少なくして、ア
イソレーション特性を向上させることのできるダイオー
ドスイッチを得ることを目的とする。
Conventional diode switches are constructed as described above, so if high isolation characteristics are required to eliminate leakage of high-frequency signals, another diode bridge can be connected in series with the high-frequency signal circuit, or a high-frequency It is necessary to add an additional terminal between the signal circuit and the ground, so input/output terminal 5,
There were problems such as an increase in the insertion loss between the drive circuits 6 and 6 and an increase in the output current of the drive circuit 3. This invention was made to solve the above-mentioned problems, and improves isolation characteristics by reducing the increase in insertion loss between high-frequency signal input and output terminals and the increase in output current of the drive circuit. The purpose is to obtain a diode switch that can

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

この発明に係るダイオードスイッチは、ダイオードブリ
ッジのバイアス電圧が供給される一対の端子間に2個の
ダイオードを他のダイオードとは逆方向に直列に接続す
ると共に、この2個のダイオードの接続中点をコンデン
サを介してアースしたものである。
In the diode switch according to the present invention, two diodes are connected in series between a pair of terminals to which a bias voltage of a diode bridge is supplied, and a midpoint between the two diodes is connected in a direction opposite to that of other diodes. is grounded via a capacitor.

【作用】[Effect]

この発明における上記2個のダイオードは、バイアス電
圧に対してダイオードブリッジとはオン。 オフが逆に動作し、高周波信号のオフ時にダイオードブ
リッジから漏れた高周波信号をコンデンサを通じてアー
スすることにより、高いアイソレーションが得られる。
In this invention, the two diodes described above are turned on as a diode bridge with respect to the bias voltage. High isolation is achieved by grounding the high frequency signal leaking from the diode bridge through the capacitor when the high frequency signal is turned off.

【実施例】【Example】

以下、この発明の一実施例を図について説明する。第1
図においては第4図と対応する部分には同一符号を付し
て説明を省略する。9はPINダイオードから成る2個
のダイオードで、ダイオードブリッジ2のバイアス電圧
が供給される一対の端子間に他のダイオードに対して逆
方向に直列に接続されている。10はダイオード9の接
続中点とアース間に接続されたコンデンサ、11は抵抗
4とダイオードブリッジ2の上記一対の端子との間に夫
々接続されたチョークコイルである。 次に動作について説明する。ドライブ回路3よリダイオ
ードブリッジ2の各ダイオード1に対して逆方向となる
バイアス電圧を抵抗4、チョークコイル11を介して加
えると、この電圧はダイオ−下9に対しては順方向電圧
となり、従って、ダイオード1がオフ、ダイオード9が
オンとなる。 この結果、入出力端子5,6間は高周波信号に対して高
損失となる。このときダイオード1から漏れる高周波信
号はダイオード9及びコンデンサ10を通じてアースさ
れるので、入出力端子5.6間の高周波信号の伝送は、
略完全にオフされる。 また、ドライブ回路3より各ダイオード1に対して順方
向となるバイアス電圧を加えると、この電圧はダイオー
ド9に対しては逆方向電圧となる。 従って、ダイオード1がオン、ダイオード9がオフとな
って、入出力端子5.6間は低損失となり、高周波信号
の伝送が可能となる。なお、チョークコイル11はバイ
アス電圧に対しては低インピーダンスとなり、高周波信
号に対しては高インピーダンスとなって、高周波信号が
ドライブ回路3側に漏れるのを防止する。 なお、上記実施例では高周波回路と直列に、6個のダイ
オード1,9を組合せた回路を接続した例を示したが、
第2図に示すように、6個のダイオード1,9を組合せ
た回路を、高周波回路と直列に2組以上接続すると共に
、高周波回路とアース間に接続することにより、より完
べきなアイソレーション特性を得ることができる。 また、第3図に示すように、6個のダイオード1.9を
組合せた回路における、高周波信号の入出力端子5,6
側のダイオードlと並列に抵抗12を接続して、高周波
信号を終端させてもよい。
An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, parts corresponding to those in FIG. 4 are designated by the same reference numerals, and their explanation will be omitted. Two diodes 9 are PIN diodes, and are connected in series in the opposite direction to the other diodes between a pair of terminals to which the bias voltage of the diode bridge 2 is supplied. 10 is a capacitor connected between the connecting point of the diode 9 and the ground, and 11 is a choke coil connected between the resistor 4 and the pair of terminals of the diode bridge 2, respectively. Next, the operation will be explained. When a bias voltage in the reverse direction is applied from the drive circuit 3 to each diode 1 of the rediode bridge 2 via the resistor 4 and the choke coil 11, this voltage becomes a forward voltage to the lower diode 9. Therefore, diode 1 is turned off and diode 9 is turned on. As a result, a high loss occurs between the input and output terminals 5 and 6 for high frequency signals. At this time, the high frequency signal leaking from the diode 1 is grounded through the diode 9 and the capacitor 10, so the transmission of the high frequency signal between the input and output terminals 5 and 6 is as follows.
Almost completely turned off. Further, when a forward bias voltage is applied to each diode 1 from the drive circuit 3, this voltage becomes a reverse voltage to the diode 9. Therefore, diode 1 is turned on and diode 9 is turned off, resulting in low loss between the input and output terminals 5 and 6, making it possible to transmit high-frequency signals. Note that the choke coil 11 has a low impedance with respect to a bias voltage and a high impedance with respect to a high frequency signal, thereby preventing the high frequency signal from leaking to the drive circuit 3 side. In addition, in the above embodiment, an example was shown in which a circuit combining six diodes 1 and 9 was connected in series with the high frequency circuit.
As shown in Figure 2, more complete isolation can be achieved by connecting two or more sets of circuits that combine six diodes 1 and 9 in series with a high-frequency circuit, and connecting them between the high-frequency circuit and the ground. characteristics can be obtained. In addition, as shown in FIG. 3, high frequency signal input/output terminals 5 and 6 in a circuit combining six diodes 1.
A resistor 12 may be connected in parallel with the side diode l to terminate the high frequency signal.

【発明の効果】【Effect of the invention】

以上のように、この発明によれば、高周波回路と直列に
接続されるダイオードブリッジの、バイアス電圧が供給
される一対の端子間に2個のダイオードを直列接続した
ものを他のダイオードに対して逆方向に接続し、この2
個のダイオードの接続中点とアース間にコンデンサを接
続した構成としたので、挿入損失やドライブ回路の出力
電流を大巾に増やすことなく、高アイソレーシヨン特性
が得られる効果がある。
As described above, according to the present invention, two diodes connected in series between a pair of terminals to which a bias voltage is supplied of a diode bridge connected in series with a high frequency circuit are connected in series with respect to other diodes. Connect in the opposite direction and connect these two
Since the configuration is such that a capacitor is connected between the connection midpoint of each diode and the ground, high isolation characteristics can be obtained without significantly increasing insertion loss or the output current of the drive circuit.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例によるダイオードスイッチ
の回路図、第2図及び第3図はこの発明の他の実施例に
よるダイオードスイッチの回路図、第4図は従来のダイ
オードスイッチを示す回路図である。 1.9はダイオード、2はダイオードブリッジ、3はド
ライブ回路、5.6は高周波信号の入出力端子、10は
コンデンサ。 なお、図中、同一符号は同一、又は相当部分を示す。 ig I!2  図 = 1・夕゛4オード゛ 2:夕゛・1オードフ刀ツソ′ 516二高周波名言号のλ巳カ鳩千 9:タ聞オード 10:コンテ゛ンプ
FIG. 1 is a circuit diagram of a diode switch according to one embodiment of the present invention, FIGS. 2 and 3 are circuit diagrams of a diode switch according to other embodiments of the invention, and FIG. 4 is a circuit diagram showing a conventional diode switch. It is a diagram. 1.9 is a diode, 2 is a diode bridge, 3 is a drive circuit, 5.6 is a high frequency signal input/output terminal, and 10 is a capacitor. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. ig I! 2 Diagram = 1. Evening 4 Ord 2: Evening 1 Ordoff Sword Tsuso' 516 Two High Frequency Famous Words

Claims (1)

【特許請求の範囲】[Claims] ダイオードブリッジの一対の端子間にバイアス電圧を供
給すると共に、上記ダイオードブリッジの他の一対の端
子に高周波信号の入出力端子を夫々設けて成り、上記バ
イアス電圧を制御することにより、上記一対の入出力端
子間における上記高周波信号の伝送を制御するようにし
たダイオードスイッチにおいて、上記ダイオードブリッ
ジの上記バイアス電圧が供給される一対の端子間に2個
のダイオードを他のダイオードとは逆方向に直列に接続
し、この2個のダイオードの接続中点をコンデンサを介
して接地したことを特徴とするダイオードスイッチ。
A bias voltage is supplied between a pair of terminals of the diode bridge, and high-frequency signal input/output terminals are respectively provided to the other pair of terminals of the diode bridge, and by controlling the bias voltage, the input/output terminals of the pair of inputs are In the diode switch configured to control transmission of the high frequency signal between output terminals, two diodes are connected in series in a direction opposite to the other diodes between a pair of terminals of the diode bridge to which the bias voltage is supplied. A diode switch characterized in that the two diodes are connected to each other and the midpoint of the connection between the two diodes is grounded via a capacitor.
JP32004188A 1988-12-19 1988-12-19 Diode switch Pending JPH02164124A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32004188A JPH02164124A (en) 1988-12-19 1988-12-19 Diode switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32004188A JPH02164124A (en) 1988-12-19 1988-12-19 Diode switch

Publications (1)

Publication Number Publication Date
JPH02164124A true JPH02164124A (en) 1990-06-25

Family

ID=18117080

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32004188A Pending JPH02164124A (en) 1988-12-19 1988-12-19 Diode switch

Country Status (1)

Country Link
JP (1) JPH02164124A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053617A1 (en) * 1998-04-14 1999-10-21 Roke Manor Research Limited Radio frequency switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053617A1 (en) * 1998-04-14 1999-10-21 Roke Manor Research Limited Radio frequency switch

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