JPS6181240U - - Google Patents
Info
- Publication number
- JPS6181240U JPS6181240U JP1984164629U JP16462984U JPS6181240U JP S6181240 U JPS6181240 U JP S6181240U JP 1984164629 U JP1984164629 U JP 1984164629U JP 16462984 U JP16462984 U JP 16462984U JP S6181240 U JPS6181240 U JP S6181240U
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- circuit
- transistor
- current
- 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
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Optical Communication System (AREA)
Description
第1図は本考案による第1の実施例を示す回路
図、第2図は、第1図における直流電流の関係の
みを説明するための回路図、第3図は、第2図の
回路の動作を説明するためのグラフ、第4図は本
考案による第2の実施例を示す回路図、第5図は
従来の代表的な発光素子駆動回路の例を示す回路
図、第6図は、第5図の回路の動作時における電
流の関係を示すグラフ、第7図は従来の直流通過
形駆動回路の例を示す回路図、第8図は、第7図
における直流電流の関係のみを説明するための回
路図、第9図は、第8図の回路の動作を説明する
ためのグラフである。
図において、1,2,7,14はトランジスタ
、3,4,6,8,9〜12,15〜18は抵抗
、5は発光素子、19は同軸ケーブルである。
FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a circuit diagram for explaining only the direct current relationship in FIG. 1, and FIG. 3 is a circuit diagram of the circuit shown in FIG. 2. Graphs for explaining the operation, FIG. 4 is a circuit diagram showing a second embodiment of the present invention, FIG. 5 is a circuit diagram showing an example of a typical conventional light emitting element drive circuit, and FIG. 6 is a circuit diagram showing a second embodiment of the present invention. Figure 5 is a graph showing the current relationship during operation of the circuit, Figure 7 is a circuit diagram showing an example of a conventional DC passing type drive circuit, and Figure 8 explains only the DC current relationship in Figure 7. FIG. 9 is a graph for explaining the operation of the circuit shown in FIG. 8. In the figure, 1, 2, 7, and 14 are transistors, 3, 4, 6, 8, 9 to 12, and 15 to 18 are resistors, 5 is a light emitting element, and 19 is a coaxial cable.
Claims (1)
電気信号により該発光素子を駆動するための直流
通過形インピーダンス回路と、該直流通過形イン
ピーダンス回路の出力側と前記発光素子との並列
接続点に直列に接続され、電流値制御用のトラン
ジスタを介して該発光素子に直流バイアス電流を
供給するための直流電流供給回路とからなる発光
素子の駆動回路において、前記直流電流供給回路
に前記電流値制御用トランジスタを介して流れる
直列電流により電圧降下を生せしめるための抵抗
を接続し、かつ該接続された抵抗より前記発光素
子側の接続点に、前記電流値制御用トランジスタ
を含む回路と並列に第2のトランジスタを含む側
路を接続し、前記電流値制御用トランジスタの制
御入力の調整により前記抵抗に流れる電流値を前
記発光素子に流れる直流バイアス値に等しくし、
前記第2のトランジスタの制御入力の調整により
該側路に流れる直流値を前記直流通過形インピー
ダンス回路に流れる直流値に等しくするようにし
たことを特徴とするバイアス電流モニタ回路を備
えた発光素子の駆動回路。 a light emitting element, an output side connected to the light emitting element,
a DC passing impedance circuit for driving the light emitting element with an electric signal; and a DC passing impedance circuit connected in series to a parallel connection point between the output side of the DC passing impedance circuit and the light emitting element, and connected through a transistor for controlling a current value. and a DC current supply circuit for supplying a DC bias current to the light emitting element, wherein a voltage drop is caused by a series current flowing to the DC current supply circuit via the current value control transistor. A bypass circuit including a second transistor is connected in parallel with the circuit including the current value control transistor to a connection point closer to the light emitting element than the connected resistor, and a bypass circuit including a second transistor is connected in parallel to the circuit including the current value control transistor. adjusting the control input of the value control transistor to make the current value flowing through the resistor equal to the DC bias value flowing through the light emitting element;
A light emitting element equipped with a bias current monitor circuit, characterized in that the DC value flowing through the bypass is made equal to the DC value flowing through the DC passing impedance circuit by adjusting the control input of the second transistor. drive circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984164629U JPH039402Y2 (en) | 1984-11-01 | 1984-11-01 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1984164629U JPH039402Y2 (en) | 1984-11-01 | 1984-11-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6181240U true JPS6181240U (en) | 1986-05-29 |
JPH039402Y2 JPH039402Y2 (en) | 1991-03-08 |
Family
ID=30722490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1984164629U Expired JPH039402Y2 (en) | 1984-11-01 | 1984-11-01 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH039402Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0191484A (en) * | 1987-10-02 | 1989-04-11 | Fujitsu Ltd | Light-emitting element driving circuit |
-
1984
- 1984-11-01 JP JP1984164629U patent/JPH039402Y2/ja not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0191484A (en) * | 1987-10-02 | 1989-04-11 | Fujitsu Ltd | Light-emitting element driving circuit |
Also Published As
Publication number | Publication date |
---|---|
JPH039402Y2 (en) | 1991-03-08 |
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