The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 1998
Filed:
Aug. 22, 1995
Applicant:
Inventor:
Philip L Kurkoski, Houston, TX (US);
Assignee:
Schlumberger Technology Corporation, Sugar Land, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341118 ;
Abstract
A method and apparatus is disclosed for removing offsets and temperature induced offset drifts of electronic devices of gamma ray spectroscopy apparatus. A flash ADC circuit is used to digitize output signals from a detector assembly. The bit stream of the least significant bit lead of the ADC circuit is first integrated to produce a D.C. level proportional to the duty cycle of the bit stream appearing on such bit lead. Such D.C. level is fed back to be summed with the D.C. level of the output lead from the detector assembly, thereby canceling offset voltages from the detector assembly and associated amplifiers.