JPS63140657U - - Google Patents
Info
- Publication number
- JPS63140657U JPS63140657U JP1987032637U JP3263787U JPS63140657U JP S63140657 U JPS63140657 U JP S63140657U JP 1987032637 U JP1987032637 U JP 1987032637U JP 3263787 U JP3263787 U JP 3263787U JP S63140657 U JPS63140657 U JP S63140657U
- Authority
- JP
- Japan
- Prior art keywords
- field effect
- effect transistor
- emitting diode
- light emitting
- gate
- 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.)
- Pending
Links
- 230000005669 field effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の実施例１の回路図、第２図は
電界効果トランジスタのゲート・ソース間電圧対
ドレイン電流特性、第３図は、発光ダイオードの
電流対光出力特性である。第４図は本考案の実施
例２の回路図、第５図はトランジスタのコレクタ
・エミツタ間電圧対コレクタ電流特性、第６図は
発光ダイオードの電流対光出力特性である。第７
図は、発光ダイオードの従来の駆動回路図、第８
図は発光ダイオードの電流対光出力特性に従来の
変調信号の様子を示したものである。第８図にお
いて、｜ＩＦ１−ＩＦ｜＝｜ＩＦ２−ＩＦ｜の変
調入力電流では｜Ｐ１−Ｐ｜＜｜Ｐ２−Ｐ｜の変
調光出力となり、信号源に追随した変調光出力が
取り出せないことになる。
FIG. 1 is a circuit diagram of Embodiment 1 of the present invention, FIG. 2 is a gate-source voltage versus drain current characteristic of a field effect transistor, and FIG. 3 is a current versus light output characteristic of a light emitting diode. FIG. 4 is a circuit diagram of a second embodiment of the present invention, FIG. 5 is a transistor collector-emitter voltage versus collector current characteristic, and FIG. 6 is a light emitting diode current versus light output characteristic. 7th
The figure is a conventional drive circuit diagram of a light emitting diode, No. 8.
The figure shows the state of a conventional modulation signal in the current vs. light output characteristics of a light emitting diode. In Fig. 8, when the modulation input current is |IF 1 −IF|=|IF 2 −IF|, the modulated light output is |P 1 −P|<|P 2 −P|, and the modulated light output follows the signal source. will not be able to be taken out.
Claims (1)
抵抗を接続したソースフオロア回路と差動増幅器
とを有し、電界効果トランジスタのゲート・ソー
ス間電圧対ドレイン電流の下に凸の非線形領域に
動作点を設定したことを特徴とする発光ダイオー
ドの駆動回路。 It has a source follower circuit and a differential amplifier in which a coupling capacitor and a resistor are connected to a field effect transistor, and the operating point is set in a convex nonlinear region below the gate-source voltage versus drain current of the field effect transistor. A light emitting diode drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987032637U JPS63140657U (en) | 1987-03-05 | 1987-03-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987032637U JPS63140657U (en) | 1987-03-05 | 1987-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63140657U true JPS63140657U (en) | 1988-09-16 |
Family
ID=30839506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987032637U Pending JPS63140657U (en) | 1987-03-05 | 1987-03-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63140657U (en) |
-
1987
- 1987-03-05 JP JP1987032637U patent/JPS63140657U/ja active Pending
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