Semiconductor light emitting device driving circuit

半導体発光素子駆動回路

Abstract

PURPOSE: To prevent the pulse width of an output optical signal from being narrowed in a semiconductor light emitting element driving circuit using a bias current lower than a threshold current. CONSTITUTION: There are provided a first differential amplifier circuit a for receiving an input signal, a pair of level shift circuits C 1 , C 2 for respectively independently level-shifting a pair of outputs from the first differential amplifier circuit (a) a second differential amplifier circuit (d) for receiving outputs from the level shift circuits C 1 , C 2 , and a switch circuit(b)for receiving a driving signal outputted from the second differential amplifier circuit (d). COPYRIGHT: (C)1993,JPO&Japio
(57)【要約】 【目的】 閾値電流よりも低いバイアス電流を使用した 半導体発光素子駆動回路において、出力光信号のパルス 幅が狭くなることを防止する。 【構成】 入力信号を受ける第1差動増幅回路Aと、該 第1差動増幅回路Aの1対の出力を各々独立してレベル シフトする1対のレベルシフト回路C 1 、C 2 と、該レ ベルシフト回路C 1 、C 2 の出力を受ける第2差動増幅 回路Dと、該第2差動増幅回路Dの出力する駆動信号を 受けるスイッチ回路Bとを備える。

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Cited By (7)

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    EP-1503429-A4December 06, 2006Rohm Co LtdDispositif de commande d'elements electroluminescents et dispositif electronique pourvu d'un element electroluminescent
    US-6822403-B2November 23, 2004Rohm Co., Ltd.Light emitting element drive device and electronic device having light emitting element
    US-6949892-B2September 27, 2005Rohm Co., Ltd.Light emitting element drive device and electronic device light emitting element
    US-8358080-B2January 22, 2013Canon Kabushiki KaishaLight emitting element driving circuit
    WO-03096435-A1November 20, 2003Rohm Co., Ltd.Light emitting element drive device and electronic device having light emitting element
    WO-03096436-A1November 20, 2003Rohm Co., Ltd.Dispositif d'attaque a element electroluminescent et dispositif electronique dote d'un element electroluminescent