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US 7,405,681 B2Granted
A/D converter calibration test sequence insertion
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsBengt Erik Jonsson, Christer Alf Jansson
Life of this patent
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Abstract
An A/D converter stage including an A/D sub-converter connected to a D/A sub-converter (12) is calibrated by a method that inserts a calibration test sequence into the D/A sub-converter. This is accomplished by forcing (SW) the comparators (COMP1-COMP7) of the A/D sub-converter to generate and insert the sequence into the D/A sub-converter.
Claims4
An A/D converter stage comprising:
- a D/A sub-converter;
- an A/D sub-converter comprising comparators and connected to the D/A sub-converter;
- and
- means for modifying comparator thresholds of the comparators of the A/D sub-converter for generating and inserting a calibration test sequence into the D/A sub-converter.
1 more element
An A/D converter stage comprising:
- a D/A sub-converter
- an A/D sub-converter comprising comparators and connected to the D/A sub-converter;
- and
- means for modifying comparator input signals to the comparators of the A/D sub-converter for generating and inserting a calibration test sequence into the D/A sub-converter.
1 more element
An A/D converter stage comprising:
- a D/A sub-converter;
- an A/D sub-converter comprising comparators and connected to the D/A sub-converter;
- and
- means for modifying comparator offset adjustments of the comparators of the A/D sub-converter for generating and inserting a calibration test sequence into the D/A sub-converter.
1 more element
An A/D converter comprising:
- an A/D sub-converter comprising plural comparators;
- a D/A sub-converter connected to output terminals of the plural comparators;
- a calibration test sequence generator for generating a calibration test sequence;
- a control switch configured to control application of the calibration test sequence to input terminals of the plural comparators whereby the D/A sub-converter produces a calibration sample, and wherein the control switch is configured to modify at least one of the following for generating said calibration test sequence:
- comparator thresholds;
- comparator input signals;
- and comparator offset adjustments.
4 more elements
Dependencies are inferred from the claim text.