JPH02168717A - Diode switching circuit - Google Patents
Diode switching circuitInfo
- Publication number
- JPH02168717A JPH02168717A JP32406488A JP32406488A JPH02168717A JP H02168717 A JPH02168717 A JP H02168717A JP 32406488 A JP32406488 A JP 32406488A JP 32406488 A JP32406488 A JP 32406488A JP H02168717 A JPH02168717 A JP H02168717A
- Authority
- JP
- Japan
- Prior art keywords
- diode
- terminal
- resistor
- capacitor
- impedance matching
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000013642 negative control Substances 0.000 description 2
- 239000013641 positive control Substances 0.000 description 2
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はダイオードスイッチ回路に関し、特に高周波信
号のスイッチングに使用されるダイオードスイッチ回路
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a diode switch circuit, and particularly to a diode switch circuit used for switching high frequency signals.
第２図は従来のダイオードスイッチ回路の一例を示す回
路図てあり、参照番号１及び２はダイオードスイッチ回
路の入力及び出力用の端子、３及び４は直流の制御電圧
を与えるための端子、５〜７はダイオ−１〜、１０〜１
２は抵抗器、１７〜２Ｏは直流素子用のコンデンサを、
それぞれ示す。FIG. 2 is a circuit diagram showing an example of a conventional diode switch circuit. Reference numbers 1 and 2 are input and output terminals of the diode switch circuit, 3 and 4 are terminals for applying a DC control voltage, and 5 is a circuit diagram showing an example of a conventional diode switch circuit. ~7 is Dio-1~, 10~1
2 is a resistor, 17~2O is a capacitor for DC elements,
Each is shown below.
まず端子３にプラス、端子４にマイナスの制御電圧か印
加された場合、電流がダイオード６、抵抗器］Ｏ、ダイ
オード７を順方向に流れ、ダイオード６及び７がオン状
態になる。このとき、ダイオード５は抵抗器１０の電圧
降下分たけ逆バイアスされて、オフ状態になる。この結
果、端子１及び２間ては信号が伝達されない状態となり
、ダイオードスイッチ回路はオフ状態となる。また、端
子３にマイナス、端子４にプラス電圧が印加されると、
電流か抵抗器］２、ダイオード５、抵抗器１１に流れ、
ダイオード５はオン状態となる。このときダイオード７
及び６は、それぞれ抵抗器］２及び１１の電圧降下分だ
け逆バイアスされて、オフ状態になる。その結果、端子
１及び２間に信号が流れ得る状態となり、ダイオードス
イッチ回路はオン状態となる。First, when a positive control voltage is applied to the terminal 3 and a negative control voltage is applied to the terminal 4, a current flows in the forward direction through the diode 6, the resistor O, and the diode 7, and the diodes 6 and 7 are turned on. At this time, the diode 5 is reverse biased by the voltage drop of the resistor 10, and is turned off. As a result, no signal is transmitted between terminals 1 and 2, and the diode switch circuit is turned off. Also, when a negative voltage is applied to terminal 3 and a positive voltage is applied to terminal 4,
current or resistor] 2, diode 5, resistor 11,
Diode 5 is turned on. At this time, diode 7
and 6 are reverse biased by the voltage drop of resistors] 2 and 11, respectively, and are turned off. As a result, a signal can flow between terminals 1 and 2, and the diode switch circuit is turned on.
上述した従来のダイオードスイッチ回路では、オフ状態
になった時には、端子１及び２から見込んた高周波信号
に対するインピータンスか、ダイオード６及び７がオン
状態になるため殆とセロになり、インピーダンス整合を
要求される個所に使用てきないという問題点かある。In the conventional diode switch circuit described above, when it is in the off state, the impedance to the high frequency signal expected from terminals 1 and 2 is almost zero because diodes 6 and 7 are in the on state, and impedance matching is required. The problem is that it cannot be used where it is used.
本発明の目的は、」二連の問題点を解決しオフ状態にお
いてもインピータンス整合できるダイオードスイッチ回
路を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a diode switch circuit that solves the two problems and allows impedance matching even in the OFF state.
本発明のダイオードスイッチ回路は、入力端子に一端を
接続した第１のコンデンサと、出力端子に一端を接続し
た第２のコンデンサと、第１の制御端子及び接地間に接
続した第３のコンデンサと、第２の制御端子及び接地間
に接続した第４のコンデンサと、抵抗器を並列接続して
ありカソードを前記第１のコンデンサの他端に接続した
第１のタイオー１’と、抵抗器を並列接続してありカッ
−Ｉ〜を前記第２のコンデンサの他端に接続しアノード
を前記第１のダイオードのアノードに接続した第２のダ
イオードと、抵抗器を直列接続し更に他の抵抗器を並列
接続してあり前記第２の制御端子及び前記第１のダイオ
ードのカソードの間にアノードを前記第２の制御端子の
方に向けて接続した第３のダイオードと、抵抗器を並列
接続してありカッ−１−を前記第１の制御端子に接続し
アノードを前記第１及び第２のダイオードのアノードに
接続した第４のダイオードと、抵抗器を直列接続し更に
他の抵抗器を並列接続してあり前記第２の制御端子及び
前記第２のダイオードのカソードの間にアノ−１〜を前
記第２の制御端子の方に向けて接続した第５のダイオー
ドとを、備えている。The diode switch circuit of the present invention includes a first capacitor having one end connected to the input terminal, a second capacitor having one end connected to the output terminal, and a third capacitor connected between the first control terminal and ground. , a fourth capacitor connected between the second control terminal and ground, a resistor connected in parallel, and a first capacitor 1' whose cathode is connected to the other end of the first capacitor, and a resistor connected in parallel. A second diode which is connected in parallel and whose anode is connected to the other end of the second capacitor and whose anode is connected to the anode of the first diode, and a resistor which is connected in series and another resistor. are connected in parallel, and a third diode whose anode is connected between the second control terminal and the cathode of the first diode with its anode facing toward the second control terminal, and a resistor are connected in parallel. A resistor is connected in series with a fourth diode whose terminal is connected to the first control terminal and whose anode is connected to the anodes of the first and second diodes, and another resistor is connected in parallel. and a fifth diode connected between the second control terminal and the cathode of the second diode with anodes 1 to 1 facing toward the second control terminal.
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を示す回路図である。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
参照番号１及び２はダイオードスイッチ回路の入出力用
の端子、３及び４は制御電圧を与えるための端子、５〜
９はダイオード、１０〜１６は抵抗器、１７〜２１はコ
ンデンサを、それぞれ示す。Reference numbers 1 and 2 are input/output terminals of the diode switch circuit, 3 and 4 are terminals for applying a control voltage, and 5-
9 is a diode, 10 to 16 are resistors, and 17 to 21 are capacitors, respectively.
まず端子３にマイナス、端子４にプラスの制御電圧か印
加された場合、電流は、抵抗器１６．ダイオード９．抵
抗器１］、ダイオード８を通る経路と、抵抗器］３．ダ
イオード７、抵抗器１０．ダイオード８を通る経路とを
、順方向に流れ、ダイオード７．８．９がオン状態にな
る。このときダイオード５は抵抗器１０の電圧降下分た
け逆バイアスされ、またダイオード６は抵抗器１］の電
圧降下分だけ逆バイアスされて、いずれもオフ状態にな
る。この結果、端子］及び２間では信号か伝達されない
状態となり、ダイオードスイッチ回路はオフ状態となる
。また、端子３にプラス 端子４にマイナス２電圧が印
加されると、電流は、抵抗器１４．ダイオード５．抵抗
器１２を通る経路と、抵抗器１４．タ゛イオード６．抵
抗器１５を通る経路とを、順方向に流れる。これにより
、ダイオード５．６はオン状態となり、また夕′イオー
１〜７．８．９はそれぞれ抵抗器１２，１４，１．５の
電圧効果分たけ逆バイアスされてオフ状態になる。First, when a negative control voltage is applied to terminal 3 and a positive control voltage is applied to terminal 4, the current flows through resistor 16. Diode9. Resistor 1], path through diode 8, and resistor]3. Diode 7, resistor 10. The current flows in the forward direction through the diode 8, and the diode 7.8.9 is turned on. At this time, diode 5 is reverse biased by the voltage drop of resistor 10, and diode 6 is reverse biased by the voltage drop of resistor 1, both of which are turned off. As a result, no signal is transmitted between the terminals 1 and 2, and the diode switch circuit is turned off. Also, when a positive voltage is applied to terminal 3 and a negative voltage is applied to terminal 4, the current flows through resistor 14. Diode 5. A path through resistor 12 and resistor 14 . Diode 6. The current flows through the resistor 15 in the forward direction. As a result, the diode 5.6 is turned on, and the diode 1 to 7.8.9 are reverse biased by the voltage effect of the resistors 12, 14, and 1.5, respectively, and turned off.
この結果、端子１及び２間に信号が流れ得る状態となり
、ダイオードスイッチ回路はオン状態となる。As a result, a signal can flow between terminals 1 and 2, and the diode switch circuit is turned on.
次に、このダイオードスイッチ回路がオフ状態となった
時における高周波信号に対するインピータンスについて
考える。ます、端子１から見込んなインピータンスは、
ダイオード７及び８がオン状態となるため、抵抗器］、
０，１２．１３の並列接続値になる。従って、端子１て
インピータンス整合させるには、抵抗器１３をインピー
タンス整合する抵抗値にし、且つ抵抗器１．０，１．２
の値を十分大きくずれは良い。同様に端子２から見込ん
なインピータンスは抵抗器１１，１５．］、６の並列接
続値になり、抵抗器１６をインピーダンス整合する抵抗
値にし、且つ抵抗器１１．．１．５の値を十分大きくず
れは、端子２てのインピータンス整合が得られる。Next, consider the impedance to high frequency signals when this diode switch circuit is in the off state. The expected impedance from terminal 1 is
Since diodes 7 and 8 are turned on, the resistor],
The parallel connection value is 0.12.13. Therefore, in order to match the impedance of the terminal 1, the resistor 13 should have a resistance value that matches the impedance, and the resistors 1.0 and 1.2 should have a resistance value that matches the impedance.
It is good if the value of is sufficiently large. Similarly, the impedance expected from terminal 2 is resistor 11, 15 . ], 6 are connected in parallel, the resistor 16 has a resistance value that matches the impedance, and the resistor 11 . ．． If the value of 1.5 is sufficiently large, impedance matching at terminal 2 can be obtained.
以上説明したように本発明によれば、スイッチンクのオ
フ状態においても入出力端で外部回路に対してインピー
タンス整合するダイオードスイッチ回路を実現できる。As described above, according to the present invention, it is possible to realize a diode switch circuit that performs impedance matching with an external circuit at the input and output terminals even when the switch is in the off state.
第１図は本発明の実施例を示す回路図、第２図は従来の
ダイオードスイッチ回路を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional diode switch circuit.
１〜４・・・端子、５〜９・・ダイオード、１０〜１６
・・抵抗器、１７〜２］・・コンデンサ。1-4...terminal, 5-9...diode, 10-16
...Resistor, 17-2]...Capacitor.
Claims (1)
子に一端を接続した第２のコンデンサと、第１の制御端
子及び接地間に接続した第３のコンデンサと、第２の制
御端子及び接地間に接続した第４のコンデンサと、抵抗
器を並列接続してありカソードを前記第１のコンデンサ
の他端に接続した第１のダイオードと、抵抗器を並列接
続してありカソードを前記第２のコンデンサの他端に接
続しアノードを前記第１のダイオードのアノードに接続
した第２のダイオードと、抵抗器を直列接続し更に他の
抵抗器を並列接続してあり前記第２の制御端子及び前記
第１のダイオードのカソードの間にアノードを前記第２
の制御端子の方に向けて接続した第３のダイオードと、
抵抗器を並列接続してありカソードを前記第１の制御端
子に接続しアノードを前記第１及び第２のダイオードの
アノードに接続した第４のダイオードと、抵抗器を直列
接続し更に他の抵抗器を並列接続してあり前記第２の制
御端子及び前記第２のダイオードのカソードの間にアノ
ードを前記第２の制御端子の方に向けて接続した第５の
ダイオードとを、備えていることを特徴とするダイオー
ドスイッチ回路。a first capacitor with one end connected to the input terminal, a second capacitor with one end connected to the output terminal, a third capacitor connected between the first control terminal and ground, and a third capacitor connected between the second control terminal and ground. a fourth capacitor connected in between; a first diode having a resistor connected in parallel and having its cathode connected to the other end of the first capacitor; and a resistor connected in parallel and having its cathode connected to the second diode. A second diode connected to the other end of the capacitor and having its anode connected to the anode of the first diode, a resistor connected in series, and another resistor connected in parallel, the second control terminal and An anode between the cathode of the first diode and the second diode.
a third diode connected toward the control terminal of;
a fourth diode with resistors connected in parallel, a cathode connected to the first control terminal, and an anode connected to the anodes of the first and second diodes; and a fourth diode with resistors connected in series and another resistor. and a fifth diode connected between the second control terminal and the cathode of the second diode with its anode facing toward the second control terminal. A diode switch circuit featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32406488A JP2702198B2 (en) | 1988-12-21 | 1988-12-21 | Diode switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32406488A JP2702198B2 (en) | 1988-12-21 | 1988-12-21 | Diode switch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02168717A true JPH02168717A (en) | 1990-06-28 |
| JP2702198B2 JP2702198B2 (en) | 1998-01-21 |
Family
ID=18161751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32406488A Expired - Lifetime JP2702198B2 (en) | 1988-12-21 | 1988-12-21 | Diode switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2702198B2 (en) |
-
1988
- 1988-12-21 JP JP32406488A patent/JP2702198B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2702198B2 (en) | 1998-01-21 |
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