JPS6142455B2 - - Google Patents
Info
- Publication number
- JPS6142455B2 JPS6142455B2 JP55032335A JP3233580A JPS6142455B2 JP S6142455 B2 JPS6142455 B2 JP S6142455B2 JP 55032335 A JP55032335 A JP 55032335A JP 3233580 A JP3233580 A JP 3233580A JP S6142455 B2 JPS6142455 B2 JP S6142455B2
- Authority
- JP
- Japan
- Prior art keywords
- switching
- intermediate frequency
- diode
- switching diode
- frequency band
- 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.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Electronic Switches (AREA)
- Superheterodyne Receivers (AREA)
Description
【発明の詳細な説明】
本発明はセツト予備方式またはスペースダイバ
ーシテイ方式用ヘテロダイン無線装置の中間周波
回路部に使用される中間周波帯切替器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermediate frequency band switching device used in an intermediate frequency circuit section of a heterodyne radio device for a set reserve system or a space diversity system.
伝搬中にフエージング等の影響を受け易いマイ
クロ波通信では受信電界は時時刻刻変化する。し
たがつて安定した通信を行うために２波の受信を
行ない、受信機側で最良ルートを選択する方式、
すなわちスペースダイバーシテイ方式等が一般的
に行なわれている。 In microwave communication, which is easily affected by fading and the like during propagation, the received electric field changes over time. Therefore, in order to achieve stable communication, there is a method in which two waves are received and the receiver side selects the best route.
In other words, a space diversity method is commonly used.
従来の前記方式に用いられる中間周波帯切替器
は切替ダイオードを用いて切替選択を行なつてい
る。この切替ダイオードは、切替動作において、
0Vと順方向バイアスまたは負電源と正電源の２
電源により動作するよう構成されている。前者の
場合は0Vにおいて十分な高抵抗が得られなく漏
洩電力が大きく伝送特性を劣化させ易く、後者の
場合は二電源を使用するので高価になるという問
題がある。 The conventional intermediate frequency band switch used in the above system uses a switching diode to perform switching selection. In the switching operation, this switching diode
0V and forward bias or negative supply and positive supply 2
It is configured to operate from a power source. In the former case, a sufficiently high resistance cannot be obtained at 0V, resulting in large leakage power, which tends to deteriorate transmission characteristics, and in the latter case, two power sources are used, making it expensive.
まずこの漏洩の問題を図面を参照して説明す
る。 First, this leakage problem will be explained with reference to the drawings.
第１図は従来の１電源タイプの中間周波帯切替
器の構成例を示す回路図である。 FIG. 1 is a circuit diagram showing an example of the configuration of a conventional single power supply type intermediate frequency band switch.
図において１，２は中間周波帯の入出力端子、
４は駆動入力端子、５は電源端子であつて、この
例では負電源を使用している。１１〜１５は切替
用ダイオードである。また２１〜２４は抵抗、４
１〜４５は中間周波遮断用チヨークコイル、５１
〜５８はコンデンサである。駆動入力端子４に負
電圧を入力した場合、ダイオード１１，１２はオ
ン状態、ダイオード１３〜１５は零バイアス状態
となり、中間周波帯は入出力端子１―２間で導通
となる。また駆動入力端子４に地気信号を入力し
た場合にはダイオード１３，１４，１５がオン状
態、ダイオード１１，１２が零バイアス状態とな
り、１または２に入力された中間周波帯は各々抵
抗２３又は２４で終端される。 In the figure, 1 and 2 are intermediate frequency band input/output terminals,
4 is a drive input terminal, and 5 is a power supply terminal, in which a negative power supply is used in this example. 11 to 15 are switching diodes. Also, 21 to 24 are resistances, 4
1 to 45 are intermediate frequency cutoff coils, 51
-58 are capacitors. When a negative voltage is input to the drive input terminal 4, the diodes 11 and 12 are in an on state, the diodes 13 to 15 are in a zero bias state, and the intermediate frequency band becomes conductive between the input and output terminals 1 and 2. Further, when an earth signal is input to the drive input terminal 4, the diodes 13, 14, and 15 are in the on state, the diodes 11 and 12 are in the zero bias state, and the intermediate frequency band input to the drive input terminal 4 is connected to the resistor 23 or 2, respectively. 24.
このような従来の中間周波数切替器では切替用
ダイオード１１，１２が零バイアスで非導通時十
分高抵抗となつていないため中間周波帯の遮断が
充分でなく、たとえば入力端子１と２において中
間周波帯におけるアイソレーシヨンは大きくとれ
ず伝送特性を劣化させる欠点があつた。 In such a conventional intermediate frequency switch, the switching diodes 11 and 12 do not have a sufficiently high resistance when non-conducting at zero bias, so the intermediate frequency band is not blocked sufficiently. This had the disadvantage that the isolation in the band was not large enough to deteriorate the transmission characteristics.
本発明の目的は１電源でオフ状態のダイオード
に逆バイアス電圧を印加する事に因り、前述した
アイソレーシヨンを高めた中間周波切替器を提供
することにある。 An object of the present invention is to provide an intermediate frequency switching device that can improve the above-mentioned isolation by applying a reverse bias voltage to a diode in an off state using one power source.
前記目的を達成するために、本発明による一電
源供給形中間周波帯切替器はヘテロダイン無線装
置の中間周波数回路部に使用され、駆動入力信号
により切替用ダイオードを導通または非導通に切
替ることにより中間周波帯信号を切替える一電源
供給形中間周波帯切替器において、２個のツエナ
ダイオードを電源にツエナ電圧が得られる同一極
性で直列に接続し、前記両ツエナダイオード間の
接続点に、第１の抵抗と直列接続された第１の切
替用ダイオードの陽極側と、第２の抵抗と直列接
続された第２の切替用ダイオードの陰極側を接続
し、前記両切替用ダイオードの他端側に同一の駆
動入力信号を印加し、当該駆動入力信号により前
記第１の切替用ダイオードが導通させられたとき
は前記ツエナダイオードの一方を介して順電流が
供給されるとともに前記第２の切替用ダイオード
に固定負バイアス電圧が供給され、前記第２の切
替用ダイオードが導通させられたときは前記ツエ
ナダイオードの他方を介して順電流が供給される
とともに前記第１の切替用ダイオードに固定負バ
イアス電圧が供給され、前記ツエナダイオードの
一方が常時非導通状態を形成するように構成して
ある。 To achieve the above object, a power supply type intermediate frequency band switching device according to the present invention is used in an intermediate frequency circuit section of a heterodyne radio device, and the switching diode is switched into conduction or non-conduction by a drive input signal. In a power supply type intermediate frequency band switching device that switches intermediate frequency band signals, two Zener diodes are connected in series with the same polarity to obtain a Zener voltage to the power supply, and a first The anode side of a first switching diode connected in series with a resistor is connected to the cathode side of a second switching diode connected in series with a second resistor, and the other end side of both switching diodes is connected. When the same drive input signal is applied and the first switching diode is made conductive by the drive input signal, a forward current is supplied through one of the Zener diodes and the second switching diode is turned on. A fixed negative bias voltage is supplied to the first switching diode, and when the second switching diode is made conductive, a forward current is supplied through the other Zener diode and a fixed negative bias voltage is supplied to the first switching diode. is supplied, and one of the Zener diodes is configured to be in a non-conducting state at all times.
上記構成によれば、本発明の目的は完全に達成
できる。 According to the above configuration, the object of the present invention can be completely achieved.
以下図面等を参照して本発明による中間周波切
替器をさらに詳しく説明する。 The intermediate frequency switching device according to the present invention will be explained in more detail below with reference to the drawings and the like.
第２図は本発明による中間周波切替器の第１の
実施例を示す回路図である。１，２は中間周波帯
の入出力端子、４は駆動入力端子、５は電源端
子、６１，６２は直列接続されたツエナダイオー
ド、２１，２２は抵抗である。抵抗２１，２２お
よびツエナダイオード６１，６２は下式を満足す
るように選定する。 FIG. 2 is a circuit diagram showing a first embodiment of an intermediate frequency switch according to the present invention. 1 and 2 are intermediate frequency band input/output terminals, 4 is a drive input terminal, 5 is a power supply terminal, 61 and 62 are Zener diodes connected in series, and 21 and 22 are resistors. The resistors 21 and 22 and the Zener diodes 61 and 62 are selected so as to satisfy the following formula.
V61＋V62＋Ｒ22i1＞Ｖ ……(1)
V61＋V62＋Ｒ21i2＞Ｖ ……(2)
ここで
Ｖ：電源電圧
V61，V62：ツエナダイオード６１，６２のツエ
ナ電圧
R21，R22：抵抗２１，２２の抵抗値
i1：ダイオード１１，１２が導通時にダイオー
ド１１に流れる電流値
i2：ダイオード１３，１４，１５が導通時にダ
イオード１３に流れる電流値
(1)，(2)式はツエナダイオード６１，６２が同時
に導通とならないための条件を与えている。(1)，
(2)式が成立するとバイアス回路自体での電力消費
は生じない。 V 61 +V 62 +R 22i1 ＞V ……(1) V 61 ＋V 62 +R 21i2 ＞V ……(2) Here, V: Power supply voltage V 61 , V 62 : Zener voltage of Zener diodes 61, 62 R 21 , R 22 : Resistance value of resistors 21, 22 i 1 : Value of current flowing through diode 11 when diodes 11, 12 are conductive i 2 : Value of current flowing through diode 13 when diodes 13, 14, 15 are conductive (1), (2) The formula provides a condition for the Zener diodes 61 and 62 not to become conductive at the same time. (1),
If equation (2) holds true, no power consumption occurs in the bias circuit itself.
第２図の回路において駆動入力端子４に負電圧
を入力すると、ツエナダイオード６２および切替
用ダイオード１１，１２がオン状態、ツエナダイ
オード６１がオフ状態となる。そして電流は６２
→２２→４１→１１→１２→４４→２３→４５→
４を流れ中間周波帯信号は１―２間で導通とな
る。このときダイオード１３，１４，１５には抵
抗２３の電圧降下分の逆バイアス電圧が印加され
るので、中間周波帯信号のダイオード１３，１
４，１５による漏洩は小さく押えられる。 In the circuit shown in FIG. 2, when a negative voltage is input to the drive input terminal 4, the Zener diode 62 and the switching diodes 11 and 12 are turned on, and the Zener diode 61 is turned off. and the current is 62
→22→41→11→12→44→23→45→
4 and the intermediate frequency band signal becomes conductive between 1 and 2. At this time, a reverse bias voltage corresponding to the voltage drop of the resistor 23 is applied to the diodes 13, 14, 15, so that the diodes 13, 1 of the intermediate frequency band signal are
4 and 15 can be suppressed to a small level.
駆動入力端子４に地気信号を接続すると、ツエ
ナダイオード６１および切替用ダイオード１３，
１４，１５がオン状態、ツエナダイオード６２が
オフ状態となる。電流は４→４５→１５→２４→
４３→１４→４２→１３→４１→２１→６１→５
を流れ、１または２に入力された中間周波帯信号
は各々抵抗２５または２６で終端される。このと
きダイオード１１，１２には抵抗２４の電圧降下
分の逆バイアス電圧が印加される。そのためダイ
オード１１，１２の高周波インピーダンスは零バ
イアス時に比べて大きくなり、中間周波帯信号の
ダイオード１１，１２による漏洩は従来の回路に
比して小さくなり、高アイソレーシヨンが達成さ
れる。 When the earth signal is connected to the drive input terminal 4, the Zener diode 61 and the switching diode 13,
14 and 15 are in the on state, and the Zener diode 62 is in the off state. The current is 4→45→15→24→
43→14→42→13→41→21→61→5
The intermediate frequency band signal input to 1 or 2 is terminated at a resistor 25 or 26, respectively. At this time, a reverse bias voltage equivalent to the voltage drop across the resistor 24 is applied to the diodes 11 and 12. Therefore, the high frequency impedance of the diodes 11 and 12 becomes larger than that at zero bias, and the leakage of the intermediate frequency band signal by the diodes 11 and 12 becomes smaller than in the conventional circuit, achieving high isolation.
また、抵抗２１，２２、ツエナダイオード６４
を適当に選択することにより、電源電圧の範囲内
で切替用ダイオードに印加される逆バイアスを最
適値に設定することができる。 Also, resistors 21 and 22, Zener diode 64
By appropriately selecting , it is possible to set the reverse bias applied to the switching diode to an optimum value within the range of the power supply voltage.
第３図は第２の実施例を示す回路図である。こ
の実施例は中間周波帯信号の入出力が３端子の場
合の応用を示している。 FIG. 3 is a circuit diagram showing the second embodiment. This embodiment shows an application where the input/output of intermediate frequency band signals is three terminals.
図において１〜３は中間周波帯信号の入出力端
子、４は駆動入力端子、５，６は電源端子であ
る。また６３，６４は、前述した６１，６２と同
様に機能するツエナダイオードである。回路の動
作は第２図の場合と同様に、駆動入力端子４に負
電圧を印加した場合は、１―２間が導通となる。
入力端子３に入力された中間周波帯信号は抵抗３
０で終端される。このとき、切替用ダイオード１
２に逆電圧バイアスが印加され、２―３間で高ア
イソレーシヨンが達成される。駆動入力端子４に
地気信号を入力した場合は同様に入出力端子２―
３間が導通となり、入力端子１―２間で高アイソ
レーシヨンが達成される。このとき端子１より入
力された信号は抵抗２９により終端される。 In the figure, 1 to 3 are input/output terminals for intermediate frequency band signals, 4 is a drive input terminal, and 5 and 6 are power supply terminals. Further, 63 and 64 are Zener diodes that function similarly to 61 and 62 described above. The operation of the circuit is similar to that shown in FIG. 2, and when a negative voltage is applied to the drive input terminal 4, conduction occurs between 1 and 2.
The intermediate frequency band signal input to input terminal 3 is connected to resistor 3.
Terminated with 0. At this time, switching diode 1
A reverse voltage bias is applied to 2 and high isolation is achieved between 2 and 3. When the earth signal is input to the drive input terminal 4, the input/output terminal 2-
3 becomes conductive, and high isolation is achieved between input terminals 1 and 2. At this time, the signal input from terminal 1 is terminated by resistor 29.
以上説明したように、本発明による中間周波帯
切替器は直列接続された２個のツエナダイオード
を用いて切替に対応するバイアスを発生すること
により一電源で高アイソレーシヨンが達成され信
号の漏洩を少なくすることができるという効果が
得られる。 As explained above, the intermediate frequency band switch according to the present invention uses two Zener diodes connected in series to generate a bias corresponding to switching, thereby achieving high isolation with a single power supply and preventing signal leakage. This has the effect of reducing the amount of
第１図は従来の中間周波帯切替器の回路図、第
２図は本発明による中間周波帯切替器の第１の実
施例を示す回路図、第３図は第２の実施例を示す
回路図である。
１〜３……中間周波帯入出力端子、４……駆動
入力端子、５〜６……電源端子、１１〜１５……
切替用ダイオード、２１〜３０……抵抗、４１〜
４８……中間周波遮断用チヨークコイル、５１〜
５８……コンデンサ、６１〜６４……ツエナダイ
オード。
Fig. 1 is a circuit diagram of a conventional intermediate frequency band switching device, Fig. 2 is a circuit diagram showing a first embodiment of an intermediate frequency band switching device according to the present invention, and Fig. 3 is a circuit diagram showing a second embodiment. It is a diagram. 1-3...Intermediate frequency band input/output terminal, 4...Drive input terminal, 5-6...Power terminal, 11-15...
Switching diode, 21~30... Resistor, 41~
48...Choice coil for intermediate frequency cutoff, 51~
58...Capacitor, 61-64...Zena diode.
Claims (1)
用され、駆動入力信号により切替用ダイオードを
導通または非導通に切替ることにより中間周波帯
信号を切替える一電源供給形中間周波帯切替器に
おいて、２個のツエナダイオードを電源にツエナ
電圧が得られる同一極性で直列に接続し、前記両
ツエナダイオード間の接続点に、第１の抵抗と直
列接続された第１の切替用ダイオードの陽極側
と、第２の抵抗と直列接続された第２の切替用ダ
イオードの陰極側を接続し、前記両切替用ダイオ
ードの他端側に同一の駆動入力信号を印加し、当
該駆動入力信号により前記第１の切替用ダイオー
ドが導通させられたときは前記ツエナダイオード
の一方を介して順電流が供給されるとともに前記
第２の切替用ダイオードに固定負バイアス電圧が
供給され、前記第２の切替用ダイオードが導通さ
せられたときは前記ツエナダイオードの他方を介
して順電流が供給されるとともに前記第１の切替
用ダイオードに固定負バイアス電圧が供給され、
前記ツエナダイオードの一方が常時非導通状態を
形成するように構成したことを特徴とする一電源
供給形中間周波帯切替器。1. In a power supply type intermediate frequency band switching device that is used in the intermediate frequency circuit section of a heterodyne radio device and switches the intermediate frequency band signal by switching the switching diode into conduction or nonconduction using a drive input signal, two Zener diodes are connected in series to a power source with the same polarity to obtain a Zener voltage, and the anode side of a first switching diode connected in series with a first resistor is connected to the connection point between the two Zener diodes, and the anode side of a first switching diode connected in series with a first resistor is connected to a second resistor. The cathode side of the second switching diode connected in series with the resistor is connected, and the same drive input signal is applied to the other end side of both switching diodes, and the drive input signal causes the first switching diode to be connected to the cathode side of the second switching diode. When the diode is made conductive, a forward current is supplied through one of the Zener diodes and a fixed negative bias voltage is supplied to the second switching diode, causing the second switching diode to conduct. when a forward current is supplied through the other Zener diode, and a fixed negative bias voltage is supplied to the first switching diode,
1. A one-power supply type intermediate frequency band switching device, characterized in that one of the Zener diodes is always in a non-conducting state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233580A JPS56129433A (en) | 1980-03-14 | 1980-03-14 | Single power supply type intermediate frequency band switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3233580A JPS56129433A (en) | 1980-03-14 | 1980-03-14 | Single power supply type intermediate frequency band switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56129433A JPS56129433A (en) | 1981-10-09 |
| JPS6142455B2 true JPS6142455B2 (en) | 1986-09-20 |
Family
ID=12356075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3233580A Granted JPS56129433A (en) | 1980-03-14 | 1980-03-14 | Single power supply type intermediate frequency band switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56129433A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60249490A (en) * | 1984-05-24 | 1985-12-10 | Pioneer Electronic Corp | Gate circuit |
-
1980
- 1980-03-14 JP JP3233580A patent/JPS56129433A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56129433A (en) | 1981-10-09 |
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