System for calibrating analog-to-digital converter

Details System for calibrating analog-to-digital converter System for calibrating analog-to-digital converter

1994-09-29

1997-04-15

Gaffin, Jeffrey A.

Coded data generation or conversion

Converter calibration or testing

341118, 341172, H03M 110

Patent

active

056214065

ABSTRACT:
A calibrating system calibrates an analog-to-digital converter which has an integrator and first and second reference current sources. A quantity of charge is accumulated in the integrator. The quantity of charge is removed from the integrator by applying the first and second reference currents to the integrator for first and second time periods until the accumulated charge reaches a threshold level. The quantity of charge is reaccumulated in the integrator and again removed by applying the first and second reference currents for third and fourth time periods wherein the first and second time periods are different from the third and fourth time periods. The relative magnitude of the first and second reference currents is determined based on the first, second, third and fourth time periods.

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"Isolation Amplifier Based on Sigma Delta Moduation", National Aeronatuics and Space Administration Tech Briefs, Technical Support Package, vol. 18(7), Jul. 1994.
"High Speed A/D Converter With Variable Integrating Time", by Yada, Honjoand Hirose, IEEE, Catalog No. 86CH2271-5, 17 Jul. 1986, pp. 144-147.

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