JP2013175845A5 - - Google Patents
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- JP2013175845A5 JP2013175845A5 JP2012038141A JP2012038141A JP2013175845A5 JP 2013175845 A5 JP2013175845 A5 JP 2013175845A5 JP 2012038141 A JP2012038141 A JP 2012038141A JP 2012038141 A JP2012038141 A JP 2012038141A JP 2013175845 A5 JP2013175845 A5 JP 2013175845A5
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- impedance
- output
- branch point
- side transmission
- voltage
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Description
図示するように、抵抗電力分配器11は3本の抵抗器111、112、113が分岐点114を中心にY字状に接続された構成を有する。抵抗電力分配器11の入出力インピーダンスがZ0である場合、該抵抗電力分配器11は、3本の抵抗器111、112、113の抵抗値がいずれもZ0/3である対称な回路構成となる。このとき、入力側伝送線路2の入力端(つまり信号入力端1)並びに第1及び第2出力側伝送線路15a、15bの出力端をそれぞれインピーダンスZ0で終端した場合、その各入出力端からみた特性インピーダンスはいずれもZ0となる。したがって、上記構成の抵抗電力分配器11を用いることで、インピーダンスを整合させながら1系統の信号を2系統に分配することができる。この場合、抵抗電力分配器11中の分岐点114における電圧反射係数は0、電圧透過係数は1であり、抵抗電力分配器11における入出力端間の電圧利得は0.5である。
As shown in the figure, the resistive power distributor 11 has a configuration in which three resistors 111, 11 2 , and 11 3 are connected in a Y shape around a branch point 114. If input and output impedance of the resistive power divider 11 is Z 0, the resistive power divider 11 is symmetrical circuit configurations resistance of three resistors 111, 112, 113 is Z 0/3 none It becomes. At this time, when the input end of the input side transmission line 2 (that is, the signal input end 1) and the output ends of the first and second output side transmission lines 15a and 15b are respectively terminated with the impedance Z 0 , The observed characteristic impedances are all Z 0 . Therefore, by using the resistive power distributor 11 having the above-described configuration, it is possible to distribute one system signal to two systems while matching impedance. In this case, the voltage reflection coefficient at the branch point 114 in the resistive power distributor 11 is 0, the voltage transmission coefficient is 1, and the voltage gain between the input and output terminals in the resistive power distributor 11 is 0.5.
2本の出力側伝送線路5a、5bの特性インピーダンスはいずれもZ0であり、それらの電気長は等しくされている。例えば同一特性の同軸ケーブルを出力側伝送線路5a、5bとして用いる場合、ケーブル長を等しくすることで電気長を揃えることができる。一方、入力側伝送線路2のインピーダンス特性もZ0であるが、インピーダンス変換回路3はZ0→Z0/2のインピーダンス変換を行うものであり、入力側伝送線路2とインピーダンス変換回路3とを合わせた仮想伝送線路10の特性インピーダンスはZ0/2である。したがって、分岐点4を仮想伝送線路10からみたインピーダンスはZ0であり、信号入力端1から分岐点4をみた電圧反射係数は0、信号入力端1から出力側伝送線路5a、5bの出力端(終端Pa、Pb)への電圧透過係数は1となる。一方、分岐点4を出力側伝送線路5a、5bからみたインピーダンスはそれぞれ、
(Z0/2)//(Z0)=Z0/3
となる。また、終端Pa、Pbから分岐点4をみた電圧反射係数Γは
Γ={(Z0/3)−Z0}/{(Z0/3)+Z0}=−0.5
となる。さらに、終端Pa、Pb間の電圧透過係数は、
1+Γ=1+(−0.5)=+0.5
となる。
The characteristic impedances of the two output side transmission lines 5a and 5b are both Z 0 , and their electrical lengths are made equal. For example, when coaxial cables having the same characteristics are used as the output side transmission lines 5a and 5b, the electrical lengths can be made uniform by equalizing the cable lengths. On the other hand, the impedance characteristic of the input side transmission line 2 is also Z 0 , but the impedance conversion circuit 3 performs impedance conversion of Z 0 → Z 0/2 , and the input side transmission line 2 and the impedance conversion circuit 3 are connected to each other. The characteristic impedance of the combined virtual transmission line 10 is Z 0/2 . Therefore, the impedance when the branch point 4 is viewed from the virtual transmission line 10 is Z 0 , the voltage reflection coefficient when the branch point 4 is viewed from the signal input end 1 is 0, and the output end of the output side transmission lines 5a and 5b from the signal input end 1 The voltage transmission coefficient to (termination Pa, Pb) is 1. On the other hand, the impedance when the branch point 4 is viewed from the output transmission lines 5a and 5b is respectively
(Z 0/2 ) // (Z 0 ) = Z 0/3
It becomes. Also, termination Pa, the voltage reflection coefficient gamma viewing the branch point 4 from Pb Γ = {(Z 0/ 3) -Z 0} / {(Z 0/3) + Z 0} = - 0.5
It becomes. Furthermore, the voltage transmission coefficient between the terminations Pa and Pb is
1 + Γ = 1 + (− 0.5) = + 0.5
It becomes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012038141A JP2013175845A (en) | 2012-02-24 | 2012-02-24 | Signal transmission circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012038141A JP2013175845A (en) | 2012-02-24 | 2012-02-24 | Signal transmission circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2013175845A JP2013175845A (en) | 2013-09-05 |
JP2013175845A5 true JP2013175845A5 (en) | 2014-07-03 |
Family
ID=49268406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2012038141A Pending JP2013175845A (en) | 2012-02-24 | 2012-02-24 | Signal transmission circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2013175845A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6521436B2 (en) * | 2015-04-07 | 2019-05-29 | アズビル株式会社 | Path branching device and voltage branching circuit |
GB201509209D0 (en) * | 2015-05-28 | 2015-07-15 | Micromass Ltd | Echo cancellation for time of flight analogue to digital converter |
JP6533749B2 (en) * | 2016-01-20 | 2019-06-19 | 日本電子株式会社 | Mass spectrometer and mass spectrometry method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09214076A (en) * | 1996-02-05 | 1997-08-15 | Fujitsu Ltd | Printed wiring board |
US5705962A (en) * | 1996-12-31 | 1998-01-06 | Hughes Electronics | Microwave power dividers and combiners having an adjustable terminating resistor |
JPH1188016A (en) * | 1997-09-05 | 1999-03-30 | Japan Radio Co Ltd | Triplet planar antenna |
JP3952401B2 (en) * | 2003-01-17 | 2007-08-01 | 株式会社ルネサステクノロジ | Line branch circuit and line branch method |
JP2005094314A (en) * | 2003-09-17 | 2005-04-07 | Tdk Corp | Transmission line |
JP4404797B2 (en) * | 2005-03-29 | 2010-01-27 | 京セラ株式会社 | Wiring board |
-
2012
- 2012-02-24 JP JP2012038141A patent/JP2013175845A/en active Pending
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