Apparatus and method for cancellation of offset in gamma spectru

Details Apparatus and method for cancellation of offset in gamma spectru Apparatus and method for cancellation of offset in gamma spectru

1995-08-22

1998-01-06

Williams, Howard L.

Coded data generation or conversion

Converter compensation

H03M 110

Patent

active

057060037

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.

REFERENCES:
patent: 4481597 (1984-11-01), Robbins
patent: 4590458 (1986-05-01), Evans et al.
patent: 4602374 (1986-07-01), Nakamura et al.
patent: 4860010 (1989-08-01), Iwamatsu

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