DRIVE CIRCUIT

• Main Authors: MOTO AKIHIRO, TANAKA KEIJI
• Format: Patent
• Language: English; Japanese
• Published: 26.05.2016
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES USING STIMULATED EMISSION; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

PROBLEM TO BE SOLVED: To reduce an optical output signal's degradation caused by the optical output signal's relaxation oscillation at the 0 level.SOLUTION: A drive circuit 3 for outputting shunt drive current Ish for driving a light-emitting device LD according to an input signal comprises; a main signal generation circuit 4 for generating a main signal Ic1 for controlling ON/OFF of the light-emitting device LD according to the input signal; and an auxiliary signal generation circuit 5 for generating an auxiliary signal Ic2 that starts rising later than time at which the main signal Ic1 starts rising, at the time of the shunt drive current Ish raising and has amplitude smaller than that of the main signal Ic1. The drive circuit combines the main signal Ic1 and the auxiliary signal Ic2 to output the shunt drive current Ish.SELECTED DRAWING: Figure 1 【課題】光出力信号の０レベルでの緩和振動による光出力信号の劣化を低減すること。【解決手段】駆動回路３は、入力信号に応じて発光素子ＬＤを駆動するためのシャント駆動電流Ｉｓｈを出力する駆動回路であって、入力信号に応じて発光素子ＬＤのオン・オフを制御するための主信号Ｉｃ１を生成する主信号生成回路４と、シャント駆動電流Ｉｓｈの立ち上がりにおいて、主信号Ｉｃ１が立ち上がり始める時間よりも遅れて立ち上がりを開始し、主信号Ｉｃ１の振幅よりも小さい振幅を有する補助信号Ｉｃ２を生成する補助信号生成回路５と、を備え、主信号Ｉｃ１と補助信号Ｉｃ２とを合成することによってシャント駆動電流Ｉｓｈを出力する。【選択図】図１