Circuit and method for calibrating a digital-to-analog converter

Details Circuit and method for calibrating a digital-to-analog converter Circuit and method for calibrating a digital-to-analog converter

1997-10-03

1999-09-21

Hoff, Marc S.

Coded data generation or conversion

Converter calibration or testing

341144, H03M 110

Patent

active

059559802

ABSTRACT:
A high precision DAC (10) incorporates a low precision DAC (18) and current sources (15(A)-15(O)) whose full-scale currents are adjusted to match a reference current generated by an analog calibration circuit (28). An additional low precision DAC (20) and another current source (16) are spares that allow periodic calibration of the high precision DAC (10) to occur in the background without taking the high precision DAC (10) off-line or out of service. A thermometer code generated by a thermometer code circuit (12) is used by a thermometer mapper circuit (13) to enable the most recently calibrated current sources to generate currents having the highest probability for use by the high precision DAC (10).

REFERENCES:
patent: 5021784 (1991-06-01), Groeneveld et al.
patent: 5243347 (1993-09-01), Jackson et al.
patent: 5646619 (1997-07-01), Daubert et al.
patent: 5666118 (1997-09-01), Gersbach

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