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Patent Searching and Data


Title:
SEMICONDUCTOR SENSOR
Document Type and Number:
Japanese Patent JPH09264798
Kind Code:
A
Abstract:

To provide a semiconductor sensor capable of obtaining high sensitivity digital output for reducing the influence of noise by accurately digitizing and outputting the sensor output with a simple circuit using CMOS technology, and particularly integrating the digitizing circuit with a sensor chip.

To digitize and take out the output of a sensor 11, first CMOS circuit 12a inputted with sensor output Vs and a second CMOS circuit 12b inputted with a triangular signal Vt are commonly connected to an output terminal with the same element parameter and disposed. The output OUT1 is inputted to a comparator 13 having two stages of CMOS inverters 13a, 13b to obtain a pulse width modulation output OUT2 pulsated by a predetermined logic threshold value. Further, the output OUT 2 is passed through an AND gate to be inputted with reference clock in response to the necessity to obtain digital output of pulse number corresponding to the pulse width.


Inventors:
SHIBATA TOSHITAKA
Application Number:
JP7735296A
Publication Date:
October 07, 1997
Filing Date:
March 29, 1996
Export Citation:
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Assignee:
FUJIKURA LTD
International Classes:
G01L1/18; H01L21/8234; H01L27/088; H01L29/84; H03K7/08; H03M1/56; (IPC1-7): G01L1/18; H01L21/8234; H01L27/088; H01L29/84; H03K7/08; H03M1/56
Attorney, Agent or Firm:
Itami Masaru