JPS61149362U - - Google Patents
Info
- Publication number
- JPS61149362U JPS61149362U JP3276385U JP3276385U JPS61149362U JP S61149362 U JPS61149362 U JP S61149362U JP 3276385 U JP3276385 U JP 3276385U JP 3276385 U JP3276385 U JP 3276385U JP S61149362 U JPS61149362 U JP S61149362U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- operational amplifier
- current conversion
- conversion transistor
- input terminal
- 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
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は、本考案による半導体レーザ駆動電流
モニタ回路の一実施例の回路図、第２図は従来例
の回路図である。
１……半導体レーザ、２……パルス信号電圧―
電流変換トランジスタ、３……バイアス制御電流
―電圧変換トランジスタ、４……パルス信号電流
―電圧変換抵抗（第１の抵抗）、５……バイアス
制御電流―電圧変換抵抗（第２の抵抗）、６……
加算回路を構成する抵抗（第３の抵抗）、７……
加算回路を構成する抵抗（第４の抵抗）、８……
電圧シフト用抵抗（第７の抵抗）、９……コンデ
ンサ、１０……加算回路を構成する抵抗（第５の
抵抗）、１１……加算回路を構成する抵抗（第６
の抵抗）、１２……演算増幅器。
FIG. 1 is a circuit diagram of an embodiment of a semiconductor laser drive current monitor circuit according to the present invention, and FIG. 2 is a circuit diagram of a conventional example. 1...Semiconductor laser, 2...Pulse signal voltage-
Current conversion transistor, 3... Bias control current-voltage conversion transistor, 4... Pulse signal current-voltage conversion resistor (first resistor), 5... Bias control current-voltage conversion resistor (second resistor), 6 ……
Resistor (third resistor) forming the adder circuit, 7...
Resistor (fourth resistor) forming the adder circuit, 8...
Voltage shift resistor (seventh resistor), 9... Capacitor, 10... Resistor forming the adder circuit (fifth resistor), 11... Resistor forming the adder circuit (sixth resistor).
resistance), 12... operational amplifier.
Claims (1)
たパルス信号電圧―電流変換トランジスタおよび
バイアス制御電圧―電流変換トランジスタと、前
記パルス信号電圧―電流変換トランジスタのエミ
ツタと負電源の間、前記バイアス制御電圧―電流
変換トランジスタのエミツタと前記負電源との間
にそれぞれ接続された第１、第２の抵抗からなり
、アノードが地気に接地された前記半導体レーザ
を駆動する半導体レーザ駆動回路において、 演算増幅器と、前記パルス信号電圧―電流変換
トランジスタのエミツタと前記演算増幅器の非反
転入力端子の間に接続された第３の抵抗と、前記
バイアス制御電圧―電流変換トランジスタのエミ
ツタと前記演算増幅器の非反転入力端子の間に接
続された第４の抵抗と、前記演算増幅器の出力端
子と反転入力端子との間に接続された第５の抵抗
、および前記演算増幅器の反転入力端子と前記負
電源との間に接続された第６の抵抗とよりなる加
算回路と、 前記演算増幅器の非反転入力端子と地気との間
に接続された第７の抵抗とコンデンサを備え、 前記第５の抵抗と前記第６の抵抗の抵抗の比が
、前記第７の抵抗と前記第３の抵抗および前記第
４の抵抗の並列値との比に等しく、かつ前記第３
の抵抗と前記第４の抵抗の抵抗値が等しくなるよ
うに、各抵抗が選定されていることを特徴とする
半導体レーザ駆動電流モニタ回路。[Claims for Utility Model Registration] A pulse signal voltage-current conversion transistor and a bias control voltage-current conversion transistor whose collector is connected to the cathode of a semiconductor laser, and between the emitter of the pulse signal voltage-current conversion transistor and a negative power supply. , a semiconductor laser drive for driving the semiconductor laser, which includes first and second resistors respectively connected between the emitter of the bias control voltage-current conversion transistor and the negative power supply, and whose anode is grounded to the ground. The circuit includes: an operational amplifier; a third resistor connected between the emitter of the pulse signal voltage-current conversion transistor and a non-inverting input terminal of the operational amplifier; an emitter of the bias control voltage-current conversion transistor and the a fourth resistor connected between the non-inverting input terminal of the operational amplifier; a fifth resistor connected between the output terminal and the inverting input terminal of the operational amplifier; and the inverting input terminal of the operational amplifier. an adding circuit including a sixth resistor connected between the negative power supply; and a seventh resistor and a capacitor connected between the non-inverting input terminal of the operational amplifier and the ground; The ratio of the resistance of the fifth resistor to the sixth resistor is equal to the ratio of the seventh resistor to the parallel value of the third resistor and the fourth resistor, and
A semiconductor laser drive current monitor circuit, wherein each resistor is selected so that the resistance value of the resistor of the fourth resistor is equal to the resistance value of the fourth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3276385U JPH0349410Y2 (en) | 1985-03-07 | 1985-03-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3276385U JPH0349410Y2 (en) | 1985-03-07 | 1985-03-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61149362U true JPS61149362U (en) | 1986-09-16 |
| JPH0349410Y2 JPH0349410Y2 (en) | 1991-10-22 |
Family
ID=30534581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3276385U Expired JPH0349410Y2 (en) | 1985-03-07 | 1985-03-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0349410Y2 (en) |
-
1985
- 1985-03-07 JP JP3276385U patent/JPH0349410Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0349410Y2 (en) | 1991-10-22 |
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