Title:
DATA COMPRESSION SYSTEM FOR PHOTOMETER
Document Type and Number:
Japanese Patent JPS5842955
Kind Code:
A
Abstract:
A data compression system includes a logarithmic rationing network configured from only two chopper stabilized operational amplifiers connected to a dual slope analog-to-digital converter having a signal integrate time tint. The system is characterized in that the chopping frequency of the chopper stabilized operational amplifiers is equal to the inverse of an integer number N times the signal integrate time of the converter. For the analog-to-digital converter to average to zero the noise output due to chopping, the chopper stabilized operational amplifiers are driven together at the chopping frequency.
Inventors:
MAIKURU KAPURITO
Application Number:
JP14699182A
Publication Date:
March 12, 1983
Filing Date:
August 26, 1982
Export Citation:
Assignee:
DU PONT
International Classes:
G01J1/16; G01N21/59; H03M1/00; (IPC1-7): G01N21/59
Attorney, Agent or Firm:
Yoshio Kawaguchi
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