Title:
LIGHT EMITTING ELEMENT DRIVE CIRCUIT
Document Type and Number:
Japanese Patent JPH05121783
Kind Code:
A
Abstract:
PURPOSE:To enable a light emitting element to output an optical waveform lessened in rise jitter by compensating oscillation delay at the rise time of an optical waveform and improved in fall time by forcibly discharging the stored carrier at the time when the light emitting element transfers from an ON-state to an OFF-state. CONSTITUTION:A light emitting element drive circuit 1 is provided with a retiming circuit 10 which reproduces input NRZ data signal 20 that takes up a binary logic synchronizing with a clock signal 21 and a pulse conversion circuit 11 which converts a reproduction data signal 22 outputted from the retiming circuit 10 into a current pulse signal used for driving a light emitting element 2. A differentiation circuit 12 which shapes reproduction data signals 22 outputted from the retiming circuit 10 in waveform differentiating them at rise and at fall and a direct current bias circuit 13 which enables a differentiation control current pulse 24 where a direct current bias is given to the differentiation shaping waveform signal 23 outputted from the differentiation circuit 12 to overlap the current pulse signal of the pulse conversion circuit 11 are provided.
Inventors:
WATABE NOBUTAKA
Application Number:
JP28250991A
Publication Date:
May 18, 1993
Filing Date:
October 29, 1991
Export Citation:
Assignee:
NEC CORP
International Classes:
H01L33/00; H04B10/2507; H04B10/40; H04B10/50; H04B10/524; H04B10/60; (IPC1-7): H01L33/00; H04B10/04; H04B10/06
Attorney, Agent or Firm:
Uchihara Shin