DRIVER CIRCUIT FOR LASER DIODE
申请(专利)号： JP19870019821
专利号： JPH0459798B2 主分类号： H01S5/06 申请权利人： FUJITSU LTD
公开国代码： JP 优先权国家： JP
摘 要：
PURPOSE:To control LD drive currents under the state of littler temperature change by monitoring a pulse current value, changing the pulse current value into a signal corresponding to a peak current value and controlling the current value of an FET by a differential signal obtained by comparing the signal with a desired pulse control signal.
CONSTITUTION:An FET driver circuit has an FETQ, a bipolar transistor Tr and a capacitor C. A current monitoring circuit 2 has a low resistor R1 inserted into a circuit, through which LD drive currents flow, and an amplifier OP1. The amplifier OP1 outputs the mean value of LD drive pulse currents. Tr, R1, OP1, a mean value/mark rate circuit 4 and an amplifier OP2 constitute a negative-feedback control circuit bringing P to Vc. That is, when currents flowing through R1 are increased, the output P from a dividing circuit 4 is augmented, output voltage
申请日： 1987-01-30 公开公告日： 1992-09-24
分类号： H01S5/06;
H01S5/068 发明设计人： TSUDA TAKASHI;
KITASAGAMI HIROO;
ARAI MASANORI; OONISHI MASARU 申请国代码： JP
优先权： 19870130 JP
1982187
摘 要 附 图：
from the amplifier OP2 drops, the
transistor Tr elevates conductivity and lowers emitter potential, and currents are reduced. When currents are diminished, the process is reversed. 主权项：
权 利 要 求 说 明 书
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DRIVER CIRCUIT FOR LASER DIODE
