Data compression system for a photometer

Details Data compression system for a photometer Data compression system for a photometer

G - Physics

01

N

354/29, 73/53

G01N 21/17 (2006.01) G01J 1/16 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1188538

TITLE A DATA COMPRESSION SYSTEM FOR A PHOTOMETER ABSTRACT OF THE DISCLOSURE A data compression system includes a logarithmic ratioing 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.

410166

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