Optics: measuring and testing – By dispersed light spectroscopy
Patent
1985-02-22
1987-06-02
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
250207, 250214AG, 356326, G01J 342, H01J 3912
Patent
active
046698779
ABSTRACT:
A digital gain controlled current to voltage amplifier having particular utility for interfacing with and forming part of a spectrophotometer system with a photomultiplier tube being responsive to light for producing an analog current proportional to the intensity thereof. The digital gain controlled current to voltage amplifier incorporates a current switched multiplying digital-to-analog converter inside its feedback loop. In this manner, the feedback loop impedance may be maintained constant as its gain is varied under control of a software programmed microcomputer.
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Mitra, "An Introduction to Digital and Analog Integrated Circuits and Applications", Harper & Row, 1980, pp. 236-237, 437-438, 474.
Cummings Ronald G.
Grimes Edwin T.
Masselle Francis L.
McGraw Vincent P.
The Perkin-Elmer Corporation
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