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Title:
LIGHT TO PWM CONVERTER
Document Type and Number:
Japanese Patent JP2005260954
Kind Code:
A
Abstract:

To provide an optical/digital converter which has simple circuit configuration and whose cost is reduced.

With regard to conversion of light intensity to digital signal, the current output of a photodiode representing light intensity is converted to a voltage and provided as one input to a comparator. A sawtooth generator feeds the signal to the other input of the comparator. The output of the comparator is a pulse width modulated (PWM) digital signal where the pulse width is proportional to light intensity. The sawtooth generator can be synchronized to an external source.


Inventors:
Jaffar, Rizal
Len-li, Kevin Lim
Lee, Joon Chok
Application Number:
JP2005000064004
Publication Date:
September 22, 2005
Filing Date:
March 08, 2005
Export Citation:
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Assignee:
AGILENT TECHNOL INC
International Classes:
H03K7/08; G01J1/44; G02F7/00; H01J40/14; H04B10/04; H04B10/06; H04B10/142; H04B10/152; (IPC1-7): H04B10/04; H03K7/08; H04B10/06; H04B10/142; H04B10/152
Attorney, Agent or Firm:
古谷 聡
溝部 孝彦
西山 清春