Coded data generation or conversion – Converter calibration or testing
Patent
1986-10-06
1989-01-17
Sloyan, T. J.
Coded data generation or conversion
Converter calibration or testing
341122, 341158, 341166, H03M 138
Patent
active
047990414
ABSTRACT:
A recirculating type analog to digital converter is disclosed which has an auto-zero mode that is introduced prior to each conversion cycle. The loop is based on an arrangement of operational amplifiers and FET switches, and further includes a comparator circuit, a reference voltage source and a microprocessor which are coupled to the loop. Also coupled to appropriate points in the loop are three time gated integrator circuits which generate analog signals which respectively compensate for offset voltages of operational amplifiers in the loop, the offset voltage of the comparator circuit which is coupled to this loop, and the gain of the loop. The compensating signals which are generated in the auto-zero mode are applied to the loop during the conversion cycle.
REFERENCES:
patent: 3495238 (1970-02-01), Gabriel
patent: 3588881 (1971-06-01), Gordon
patent: 4315253 (1982-02-01), Tytus
patent: 4337456 (1982-06-01), Deffendall et al.
patent: 4385286 (1983-05-01), Haque
patent: 4529965 (1985-07-01), Lee
patent: 4590458 (1980-05-01), Evans et al.
patent: 4593268 (1986-06-01), Blauschild
patent: 4602374 (1986-07-01), Nakamura et al.
Applied Automation, Inc.
Bogatie George E.
Sloyan T. J.
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