JP2010103872A - Analog signal attenuator - Google Patents

Analog signal attenuator Download PDF

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JP2010103872A
JP2010103872A JP2008275102A JP2008275102A JP2010103872A JP 2010103872 A JP2010103872 A JP 2010103872A JP 2008275102 A JP2008275102 A JP 2008275102A JP 2008275102 A JP2008275102 A JP 2008275102A JP 2010103872 A JP2010103872 A JP 2010103872A
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attenuator
relay
analog signal
path
resistance
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Takehide Hamuro
毅英 羽室
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Yokogawa Electric Corp
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Yokogawa Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an analog signal attenuator in which a long-life and high-reliability circuit are accomplished, ON resistance of a through-path side photo MOS relay is reduced by decreasing the number of photo MOS relays by half, and influences of distortion generated in an analog signal is reduced. <P>SOLUTION: The analog signal attenuator configured to dispose a resistance attenuator and a through-path in parallel in the middle of a signal transmission line and to connect any one of them to the signal transmission line includes a first photo MOS relay to turn on/off the through-path and a second photo MOS relay for turning on/off between the resistance attenuator and a ground. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、フォトモスリレーを使用したアナログ信号減衰器に関し、例えばディジタル・アナログ混在半導体試験装置に用いて好適なアナログ信号減衰器の構成に関するものである。   The present invention relates to an analog signal attenuator using a photo moss relay, and more particularly to a configuration of an analog signal attenuator suitable for use in a digital / analog mixed semiconductor test apparatus.

従来、アナログ信号減衰器の切換部品としてメカニカルなリレーが使用されている。
しかし、メカニカルなリレーは寿命が限られており、半導体リレーと比較して寿命が短い。そのため、リレーの長寿命化をはかるため、半導体リレーとしてフォトモスリレーが使用されている。
Conventionally, a mechanical relay is used as a switching part of an analog signal attenuator.
However, mechanical relays have a limited life span and are shorter than semiconductor relays. Therefore, in order to extend the life of the relay, a photo MOS relay is used as a semiconductor relay.

図3(a,b)は従来のアナログ信号減衰器の構成を示すものである。
例えば半導体試験装置では、固定の抵抗減衰器を利用した50Ω系、あるいは75Ω系などの高速信号の伝送回路で、信号を減衰させるパスと減衰させないスルーのパスを切り替える場合がある。その場合、図3(a)のように、信号伝送ラインの途中に接続された抵抗減衰器1とスルーパス4の切換に際しては、2極タイプのメカニカルリレー3を2つ用いるか、図3(b)に示すような単極タイプのメカニカルリレーまたは、フォトモスリレー2を4つ用いて構成していた。
そして、この回路を複数縦続接続することで、任意のステップで任意の減衰量の回路を構成していた。
3A and 3B show the configuration of a conventional analog signal attenuator.
For example, in a semiconductor test apparatus, a signal attenuation path and a through path that is not attenuated may be switched in a high-speed signal transmission circuit such as a 50Ω system or a 75Ω system using a fixed resistance attenuator. In that case, as shown in FIG. 3A, when switching between the resistance attenuator 1 and the through path 4 connected in the middle of the signal transmission line, two two-pole type mechanical relays 3 are used, or FIG. ), Four single-pole type mechanical relays or photomoss relays 2 are used.
And by connecting a plurality of these circuits in cascade, a circuit having an arbitrary attenuation amount is configured in an arbitrary step.

このようなフォトモスリレーを用いた先行技術しては下記の特許文献が知られている。
特開2004−289410 特開2007−235807
The following patent documents are known as prior art using such a photomoss relay.
JP 2004-289410 A JP2007-235807

上述の従来技術では、メカニカルリレーを用いる場合は半導体タイプのフォトモスリレーに比べ寿命が短く信頼性も低いという問題点があった。
また、フォトモスリレーを用いても従来例の構成の場合にはリレーの数が増えるため信号経路のオン抵抗が増加し終端抵抗値に比べ無視できなくなる。
In the above-described prior art, when a mechanical relay is used, there is a problem that the life is short and the reliability is low as compared with a semiconductor type photo MOS relay.
Even if a photoMOS relay is used, in the case of the configuration of the conventional example, the number of relays is increased, so that the ON resistance of the signal path is increased and cannot be ignored compared to the termination resistance value.

さらに、フォトモスリレーを使用した分岐部でアナログ信号に歪みが発生するなどの問題があった。特に50Ω系、あるいは75Ω系などの伝送路で複数縦続接続する場合はこのデメリットが大きくなるという問題点があった。   Furthermore, there has been a problem that the analog signal is distorted at a branching portion using a photo moss relay. In particular, there is a problem in that this disadvantage is increased when a plurality of cascade connections are made in a 50Ω or 75Ω transmission line.

本発明は上記問題点を解決するためになされたもので、請求項1記載のアナログ信号減衰器の発明においては、
信号伝送ラインの途中に抵抗減衰器とスルーパスが並列に配置され、このうちのいずれかを前記信号伝送ラインに接続するように構成したアナログ信号減衰器において、前記スルーパスをオン/オフする第1フォトモスリレーと、前記抵抗減衰器とグランドとの間をオン/オフする第2フォトモスリレーを備えたことを特徴とする。
The present invention has been made to solve the above problems, and in the invention of an analog signal attenuator according to claim 1,
In the analog signal attenuator configured such that a resistance attenuator and a through path are arranged in parallel in the signal transmission line, and one of them is connected to the signal transmission line, a first photo for turning on and off the through path. A moss relay and a second photo moss relay for turning on / off between the resistance attenuator and the ground are provided.

請求項2においては、請求項1記載のアナログ信号減衰器の発明において、
前記第1フォトモスリレーがオンのときは前記第2フォトモスリレーがオフとなり、第1フォトモスリレーがオフのときは前記第1フォトモスリレーがオンとなるように切換えることを特徴とする。
In claim 2, in the invention of the analog signal attenuator according to claim 1,
The second photoMOS relay is switched off when the first photomoss relay is on, and the first photomoss relay is switched on when the first photomoss relay is off.

以上説明したことから明らかなように本発明の請求項1,2によれば、次のような効果がある。
メカニカルリレーを用いないため長寿命で高い信頼性の回路を実現できる。またフォトモスリレーを用いた従来の構成に比べフォトモスリレーの数を半減させることができるため、スルーパス側のフォトモスリレーのオン抵抗を小さくすることができる。
As is apparent from the above description, according to claims 1 and 2 of the present invention, the following effects can be obtained.
Since no mechanical relay is used, a long-life and highly reliable circuit can be realized. In addition, since the number of photo MOS relays can be halved compared to the conventional configuration using photo MOS relays, the on-resistance of the through-path photo MOS relay can be reduced.

また、フォトモスリレーを使用した分岐回路の場合、端子間オフ容量が端子間電圧によりへんかするためアナログ信号に歪みが発生するが、本発明の構成ではフォトモスリレーの数が減るためこの影響を軽減することができる。
さらに実装スペース、コストの面でも有利である。
In addition, in the case of a branch circuit using a photo moss relay, the analog signal is distorted because the off-capacitance between terminals is distorted by the voltage between the terminals, but this influence is reduced because the number of photo mos relays is reduced in the configuration of the present invention. Can be reduced.
Further, it is advantageous in terms of mounting space and cost.

図1は本発明の一実施例を示すアナログ信号減衰器の構成図である。図1において、図3の従来例と同一要素には同一符号を付している。1は減衰抵抗器、4はスルーパスであり、信号伝送ラインの途中に並列に接続されている。   FIG. 1 is a configuration diagram of an analog signal attenuator showing an embodiment of the present invention. In FIG. 1, the same elements as those in the conventional example of FIG. Reference numeral 1 denotes an attenuation resistor, and 4 denotes a through path, which is connected in parallel in the middle of the signal transmission line.

2aは第1フォトモスリレーであり、スルーパス4の途中に配置されてスルーパスのオン/オフを行う。2bは第2フォトモスリレーであり、一端は抵抗減衰器1に接続され、他端はGND(グランド)に接続されている。   Reference numeral 2a denotes a first photo MOS relay, which is arranged in the middle of the through path 4 to turn on / off the through path. 2b is a 2nd photomoss relay, and one end is connected to the resistance attenuator 1, and the other end is connected to GND (ground).

上述の構成においては、固定の抵抗減衰器1と信号を減衰させないスルーパスをオン/オフするためにその入出力間に配置された第1フォトモスリレー2aと、抵抗減衰器1のGND端子とGNDとの間をオン/オフするための第2フォトモスリレーの合計2個のフォトモスリレーから構成される。   In the above-described configuration, the fixed resistance attenuator 1 and the first photoMOS relay 2a arranged between the input and output in order to turn on / off the through path that does not attenuate the signal, the GND terminal of the resistance attenuator 1, and the GND A total of two photomoss relays of the second photomoss relay for turning on / off between the two.

そしてスルーパス4に接続された第1フォトモスリレー2aをオンにし、抵抗減衰器1のGND側にある第2フォトモスリレー2bをオフにすることでスルーパスが選択される。   Then, the first photo MOS relay 2a connected to the through path 4 is turned on, and the second photo MOS relay 2b on the GND side of the resistance attenuator 1 is turned off to select the through path.

逆にスルーパス4に接続された第1フォトモスリレー2aをオフにし、抵抗減衰器1のGND側にある第2フォトモスリレー2bをオンにすることで抵抗減衰器1を通るパスが選択される。抵抗減衰器1は複数の抵抗器で構成されるが、抵抗器の抵抗値をフォトモスリレーのオン抵抗を考慮して設計することで所望の減衰量からの誤差を最小にすることができる。   Conversely, the path through the resistance attenuator 1 is selected by turning off the first photoMOS relay 2 a connected to the through path 4 and turning on the second photomoss relay 2 b on the GND side of the resistance attenuator 1. . The resistance attenuator 1 is composed of a plurality of resistors, but the error from the desired attenuation can be minimized by designing the resistance value of the resistor in consideration of the on-resistance of the photo-moss relay.

図2は他の実施例を示す構成図であり、この実施例においては、図1に示すアナログ信号減衰器を直列に4段接続し、1dBステップ、最大15dBの可変減衰器を構成した場合を示している。
そして図2においては、1段目の減衰器が1dB、2段目の減衰器が2dB、3段目の減衰器が4dB、4段目の減衰器が8dBとされ、一段目、2段目、4段目の第1フォトモスリレー2aがオフとされ、一段目、2段目、4段目の第2フォトモスリレー2bがオンとされ、3段目の第2フォトモスリレー2bがオフとされている。
FIG. 2 is a configuration diagram showing another embodiment. In this embodiment, the analog signal attenuator shown in FIG. 1 is connected in four stages in series, and a variable attenuator with 1 dB step and maximum 15 dB is configured. Show.
In FIG. 2, the first-stage attenuator is 1 dB, the second-stage attenuator is 2 dB, the third-stage attenuator is 4 dB, the fourth-stage attenuator is 8 dB, and the first-stage, second-stage attenuator. The first photoMOS relay 2a at the fourth stage is turned off, the second photomoss relay 2b at the first stage, the second stage, and the fourth stage is turned on, and the second photomoss relay 2b at the third stage is turned off. It is said that.

従って、この構成では11dBの減衰を実現することができ、各減衰器の第1、第2フォトモスリレー2a,2bのオン/オフを組合わせることにより所望の減衰量を得ることができる。   Therefore, with this configuration, attenuation of 11 dB can be realized, and a desired attenuation can be obtained by combining on / off of the first and second photoMOS relays 2a and 2b of each attenuator.

なお、以上の説明は、本発明の説明および例示を目的として特定の好適な実施例を示したに過ぎない。実施例ではディジタル・アナログ混在半導体試験装置に適用した例を示したが同様の目的の他の機器に適用しても良い。
従って本発明は、上記実施例に限定されることなく、その本質から逸脱しない範囲で更に多くの変更、変形を含むものである。
The above description merely shows a specific preferred embodiment for the purpose of explanation and illustration of the present invention. In the embodiment, an example is shown in which the present invention is applied to a digital / analog mixed semiconductor test apparatus, but the present invention may be applied to other equipment having the same purpose.
Therefore, the present invention is not limited to the above-described embodiments, and includes many changes and modifications without departing from the essence thereof.

本発明の一実施例を示すアナログ信号減衰器の構成を示す図である。It is a figure which shows the structure of the analog signal attenuator which shows one Example of this invention. 他の実施例を示すアナログ信号減衰器の構成を示す図である。It is a figure which shows the structure of the analog signal attenuator which shows another Example. 従来のアナログ信号減衰器の構成を示す図である。It is a figure which shows the structure of the conventional analog signal attenuator.

符号の説明Explanation of symbols

1 抵抗減衰器
2a 第1フォトモスリレー
2b 第2フォトモスリレー
3 メカニカルリレー
4 スルーパス
DESCRIPTION OF SYMBOLS 1 Resistance attenuator 2a 1st photomoss relay 2b 2nd photomoss relay 3 Mechanical relay 4 Through-pass

Claims (2)

信号伝送ラインの途中に抵抗減衰器とスルーパスが並列に配置され、このうちのいずれかを前記信号伝送ラインに接続するように構成したアナログ信号減衰器において、前記スルーパスをオン/オフする第1フォトモスリレーと、前記抵抗減衰器とグランドとの間をオン/オフする第2フォトモスリレーを備えたことを特徴とするアナログ信号減衰器。   In the analog signal attenuator configured such that a resistance attenuator and a through path are arranged in parallel in the signal transmission line, and one of them is connected to the signal transmission line, a first photo for turning on and off the through path. An analog signal attenuator comprising a moss relay and a second photo moss relay for turning on / off between the resistance attenuator and the ground. 前記第1フォトモスリレーがオンのときは前記第2フォトモスリレーがオフとなり、第1フォトモスリレーがオフのときは前記第1フォトモスリレーがオンとなるように切換えることを特徴とする請求項1記載のアナログ信号減衰器。   The second photo MOS relay is turned off when the first photo MOS relay is on, and the first photo MOS relay is turned on when the first photo MOS relay is off. Item 10. The analog signal attenuator according to Item 1.
JP2008275102A 2008-10-27 2008-10-27 Analog signal attenuator Withdrawn JP2010103872A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48102548A (en) * 1972-04-05 1973-12-22
JPH08288791A (en) * 1995-04-11 1996-11-01 Fujitsu Ltd Attenuator unit, step attenuator having the unit and electronic equipment having the attenuator
JP2004289410A (en) * 2003-03-20 2004-10-14 Yokogawa Electric Corp Semiconductor relay
JP2007235807A (en) * 2006-03-03 2007-09-13 Advantest Corp Switching circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS48102548A (en) * 1972-04-05 1973-12-22
JPH08288791A (en) * 1995-04-11 1996-11-01 Fujitsu Ltd Attenuator unit, step attenuator having the unit and electronic equipment having the attenuator
JP2004289410A (en) * 2003-03-20 2004-10-14 Yokogawa Electric Corp Semiconductor relay
JP2007235807A (en) * 2006-03-03 2007-09-13 Advantest Corp Switching circuit

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