A/D converter calibration
AssigneeTelefonaktiebolaget LM Ericsson
InventorBengt Erik Jonsson
Life of this patent
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Abstract
A pipeline stage in a multi-bit/stage pipeline A/D converter is calibrated by switching a set of D/A converter unit-segments in the stage to predetermined states to produce a first digital signal. A second digital signal is produced by switching a predetermined unit-segment in the set to its complementary state and keeping the states of the other unit-segments in the set unchanged. The unit-segment is then associated with a calibration coefficient representing the deviation of the difference between the first and second digital signals from an expected difference between the first and second digital signals. This process is repeated for each unit-segment that is to be calibrated.
Claims14
A method of calibrating a pipeline stage in a multi-bit/stage pipeline A/D converter, comprising the steps of:
- switching a set of D/A converter unit-segments in the stage to predetermined states for producing a first digital signal from the A/D converter;
- switching a predetermined unit-segment in the set to its complementary state, keeping the states of the other unit-segments in the set unchanged, for producing a second digital signal from the A/D converter;
- associating the predetermined unit-segment with a calibration coefficient representing the deviation of the difference between the first and second digital signals from an expected difference between the first and second digital signals;
- and
- repeating the previous steps for each unit-segment that is to be calibrated.
An apparatus for calibrating a pipeline stage in a multi-bit/stage pipeline A/D converter, comprising:
- means for switching a set of D/A converter unit-segments in the stage to predetermined states for producing a first digital signal from the A/D converter;
- means for switching a predetermined unit-segment in the set to its complementary state, keeping the states of the other unit-segments in the set unchanged, for producing a second digital signal from the A/D converter;
- means for associating the predetermined unit-sternest with a calibration coefficient representing the deviation of the difference between the first and second digital signals from an expected difference between the first and second digital signals;
- and
- means for repeating the previous steps for each unit-segment that is to be calibrated.
Dependencies are inferred from the claim text.