True background calibration of pipelined analog digital converters
First Claim
1. A system for calibrating a pipeline Analog-to-Digital converter (ADC), the system comprising:
- an ideal pipeline stage that receives an input voltage of a pipeline stage and provides an ideal residue voltage;
an error function that receives a residue voltage of the pipeline stage and provides a residue voltage estimate; and
a correction algorithm that optimizes at least one parameter associated with the error function, so that the residue voltage estimate is approximately equal to the ideal residue voltage.
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Abstract
Systems and methods are provided for performing a background calibration technique on one or more stages of a pipeline Analog-to-Digital Converter (ADC). The systems and methods employs a slow but accurate analog-to-digital converter or a slow but accurate ideal pipeline stage to correct for the residue errors in a non-ideal pipeline stage using an error function and a correction algorithm. The correction algorithm determines optimal parameters of the error function, so that the error function can be utilized to compensate for errors in the ADC. The correction algorithm and results can be applied in the digital domain or in the analog domain.
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Citations
28 Claims
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1. A system for calibrating a pipeline Analog-to-Digital converter (ADC), the system comprising:
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an ideal pipeline stage that receives an input voltage of a pipeline stage and provides an ideal residue voltage;
an error function that receives a residue voltage of the pipeline stage and provides a residue voltage estimate; and
a correction algorithm that optimizes at least one parameter associated with the error function, so that the residue voltage estimate is approximately equal to the ideal residue voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for calibrating a pipeline Analog-to-Digital converter (ADC) having a plurality of pipeline stages, the system comprising:
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a calibrator comprising an ideal pipeline stage that receives an input voltage of a pipeline stage, and an error function correction component that receives a residue voltage of the pipeline stage, the ideal pipeline stage provides an ideal residue voltage to the error correction component which optimizes at least one parameter associated with an error function that can be applied to the pipeline stage to compensate for errors associated with the pipeline stage; and
a switch bank that switches the calibrator amongst the plurality of stages for performing calibration associated with a respective stage. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A system for calibrating a pipeline Analog-to-Digital converter (ADC), the system comprising:
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means for determining an ideal residue voltage from an input voltage of a pipeline stage;
means for providing a residue voltage estimate of an error function; and
means for optimizing at least one parameter associated with the error function, so that the residue voltage estimate is approximately equal to the ideal residue voltage. - View Dependent Claims (20, 21, 22)
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23. A background calibration method for calibrating a pipeline Analog-to-Digital Converter (ADC), the method comprising:
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sampling an input signal to a pipeline stage;
determining an ideal residual voltage of the pipeline stage;
providing an initial residual voltage estimate of an error function;
executing a correction algorithm to optimize at least one parameter of the error function; and
applying the error function with the at least one optimized parameter to the pipeline stage to correct for errors associated with the pipeline stage. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification