Title:
LIGHT-EMITTING DEVICE
Document Type and Number:
Japanese Patent JPH03180079
Kind Code:
A
Abstract:
PURPOSE:To improve the linearity of conversion of a light signal in relation to an input signal by providing a linearity error of an emission efficiency characteristic of a light-emitting means and a linearity error in a reverse characteristic thereto and by making them offset each other. CONSTITUTION:An amplified output S1 obtained by amplifying an input voltage signal VIN of a preamplifier 9 with a gain A and an offset output SO become the base power of N-P-N transistors 10 and 11 forming a differential couple, respectively. In this way, a voltage-current conversion characteristic of a voltage-current converting means has a linearity error in a reverse characteristic to the linearity error of an emission efficiency characteristic of a light-emitting means 4 in a prescribed current range of a current signal. Therefore the linearity errors of the two characteristics offset each other and the linearity error of the conversion rate of a light signal in relation to the input voltage signal diminishes. Thereby the linearity of the conversion characteristic from the input voltage signal to the light signal is improved.
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Inventors:
KATO NAOYUKI
Application Number:
JP31952389A
Publication Date:
August 06, 1991
Filing Date:
December 08, 1989
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H01L33/00; H04B10/2507; (IPC1-7): H01L33/00; H04B10/18
Attorney, Agent or Firm:
Masuo Oiwa (2 outside)