JPS6347094Y2 - - Google Patents
Info
- Publication number
- JPS6347094Y2 JPS6347094Y2 JP9361081U JP9361081U JPS6347094Y2 JP S6347094 Y2 JPS6347094 Y2 JP S6347094Y2 JP 9361081 U JP9361081 U JP 9361081U JP 9361081 U JP9361081 U JP 9361081U JP S6347094 Y2 JPS6347094 Y2 JP S6347094Y2
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- present
- resistor
- amplifier
- receiving circuit
- 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
- 230000005540 biological transmission Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Filters And Equalizers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【考案の詳細な説明】
本考案は、有線通信システムにおいて、トラン
スを用いて、その通信線と結合する、トランス結
合受信回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer-coupled receiving circuit that uses a transformer to couple to a communication line in a wired communication system.
従来の通信線と結合する為のトランスを用いた
受信回路の一例を第１図に示す。図において、線
路１から来た信号は、トランスを通りアツテネー
タ３を介して増幅器４に伝達される。ここで増幅
器の入力インピーダンスはシステムで要求される
特性インピーダンスと同じ値になつている。この
様な従来の構成で実装の小形化を計るとトランス
が小形になる為にトランスの伝達周波数特性、不
整合減衰特性、歪特性が劣化してしまう欠点があ
つた。この主な原因は、トランスの励磁インダク
タンスが小さくなる為である。 An example of a receiving circuit using a transformer for coupling with a conventional communication line is shown in FIG. In the figure, a signal coming from a line 1 is transmitted to an amplifier 4 via an attenuator 3 through a transformer. Here, the input impedance of the amplifier is set to the same value as the characteristic impedance required by the system. In this conventional configuration, when trying to downsize the packaging, the transformer becomes smaller, which has the disadvantage that the transmission frequency characteristics, mismatch attenuation characteristics, and distortion characteristics of the transformer deteriorate. The main reason for this is that the excitation inductance of the transformer becomes smaller.
本考案の目的は、従来技術の欠点をなくし、小
形のトランスを用いて、伝達周波数特性、不整合
減衰特性歪特性の劣化しないトランス結合受信回
路を提供するものである。 An object of the present invention is to eliminate the drawbacks of the prior art and provide a transformer-coupled receiver circuit that uses a small transformer and does not deteriorate transmission frequency characteristics, mismatched attenuation characteristics, and distortion characteristics.
本考案は、トランスの２次側の負荷インピーダ
ンスをシステムに要求される特性インピーダンス
よりも小さくすることにより、励磁インダクタン
スの低下による特性劣化を避けるものである。 The present invention avoids characteristic deterioration due to a decrease in excitation inductance by making the load impedance on the secondary side of the transformer smaller than the characteristic impedance required for the system.
第２図は本考案の一実施例を示す。線路１から
の信号は、アツテネータ３を通り入力抵抗５を介
してトランス５を通り帰環抵抗６を帰還路にもつ
増幅器７に加えられる。この時トランス２の負荷
インピーダンスは、増幅器の電圧増幅度をＡとす
れば、ミラー効果によりR2／（HA）となる。こ
こではR2は帰還抵抗の値である。この様に本考
案の構成にすればトランスの負荷抵抗が小さくな
るのでトランスに加わる電圧が小さくなり歪が改
善される。また励磁インダクタンスによる低域し
や断の周波数は、負荷インピーダンスに比例する
ので本考案の様に負荷インピーダンスを下げる
と、しや断周波数も下がるので伝達周波数特性も
改善される。不整合減衰量は本考案の場合ほぼ抵
抗５で決定されるので、励磁インダクタンスの影
響がなくなり良好な値になる。本考案の別の実施
例は第３図に示す様にアツテネータ３と抵抗器５
を平衡形にする事もできる。また第４図に別の実
施例を示す。ここでトランジスタ８は、交流等価
回路であり直流バイアスは省略してある。 FIG. 2 shows an embodiment of the present invention. The signal from the line 1 passes through an attenuator 3, an input resistor 5, a transformer 5, and is applied to an amplifier 7 having a feedback resistor 6. At this time, if the voltage amplification degree of the amplifier is A, the load impedance of the transformer 2 becomes R2/(HA) due to the Miller effect. Here R 2 is the value of the feedback resistor. As described above, with the configuration of the present invention, the load resistance of the transformer is reduced, so the voltage applied to the transformer is reduced, and distortion is improved. Furthermore, the frequency of low frequency shearing caused by the excitation inductance is proportional to the load impedance, so if the load impedance is lowered as in the present invention, the shearing frequency will also be lowered, and the transmission frequency characteristics will also be improved. In the case of the present invention, the amount of mismatch attenuation is almost determined by the resistor 5, so the influence of the excitation inductance is eliminated and a good value is obtained. Another embodiment of the present invention is as shown in FIG.
can also be made into an equilibrium form. Another embodiment is shown in FIG. Here, the transistor 8 is an AC equivalent circuit, and a DC bias is omitted.
以上述べた様に本考案によれば、トランス自体
に特別な変更をせずに小形トランスを用いて、伝
達周波数特性、不整合減衰特性、歪特性の良好な
トランス結合受信回路が構成され、伝送装置の小
形化が可能となる利点がある。 As described above, according to the present invention, a transformer-coupled receiving circuit with good transmission frequency characteristics, mismatched attenuation characteristics, and distortion characteristics is constructed using a small transformer without making any special changes to the transformer itself. This has the advantage that the device can be made smaller.
第１図は、従来技術の説明図、第２図、第３
図、第４図は本考案の一実施例の説明図である。
１……線路、２……トランス、３……アツテネ
ータ、４……増幅器、５……抵抗器、６……抵抗
器、７……増幅器、８……トランジスタ、９……
抵抗器。
Figure 1 is an explanatory diagram of the prior art, Figures 2 and 3.
FIG. 4 is an explanatory diagram of an embodiment of the present invention. 1... Line, 2... Transformer, 3... Attenuator, 4... Amplifier, 5... Resistor, 6... Resistor, 7... Amplifier, 8... Transistor, 9...
Resistor.
Claims (1)
の通信線と結合するトランス結合受信回路におい
て、トランスの１次側に抵抗器を直列に接続し、
そのトランスの２次側に、このシステムに要求さ
れる特性インピーダンスよりも低い値の入力イン
ピーダンスを有する増幅器を接続して構成した事
を特徴とするトランス結合受信回路。 In a transformer-coupled receiving circuit that uses a transformer in a wired communication system to couple with the communication line, a resistor is connected in series to the primary side of the transformer,
1. A transformer-coupled receiving circuit comprising: an amplifier having an input impedance lower than the characteristic impedance required for the system; connected to the secondary side of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9361081U JPS58533U (en) | 1981-06-26 | 1981-06-26 | Transformer coupled receiver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9361081U JPS58533U (en) | 1981-06-26 | 1981-06-26 | Transformer coupled receiver circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58533U JPS58533U (en) | 1983-01-05 |
| JPS6347094Y2 true JPS6347094Y2 (en) | 1988-12-06 |
Family
ID=29888570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9361081U Granted JPS58533U (en) | 1981-06-26 | 1981-06-26 | Transformer coupled receiver circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58533U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0621939B2 (en) * | 1986-03-07 | 1994-03-23 | 富士写真フイルム株式会社 | Photo printing equipment |
-
1981
- 1981-06-26 JP JP9361081U patent/JPS58533U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58533U (en) | 1983-01-05 |
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