Method of calibrating an analog-to-digital converter and a circuit implementing the same
AssigneeAgilent Technologies, Inc.
InventorsKenneth D. Poulton, Robert M. R. Neff, Matthew S. Holcomb, James Kang
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Abstract
A method of calibrating a high-speed analog to digital converter and an ADC that implements the method. Multiple linear regression analysis is used to calibrate the stages of a pipeline ADC to compensate for variations in gain from stage to stage and optionally to compensate for harmonic distortion. Current amplifiers each having gain of about 1.6 are used for low power consumption, minimal surface area requirements, and rapid sampling speed. Weighting factors are stored in lookup tables to minimize the number of adders required to generate the output digital word.
Claims15
A method of calibrating an analog-to-digital converter comprising:
- applying an analog calibration signal to the analog-to-digital converter to obtain a plurality of codes;
- performing multiple linear regression analysis on the codes to generate a plurality of weighting factors;
- and
- storing the weighting factors.
A method of converting an analog input signal into a digital output signal, comprising:
- applying an analog calibration signal to an analog-to-digital converter to obtain a plurality of codes;
- performing multiple linear regression analysis on the codes to generate a plurality of weighting factors;
- storing the weighting factors;
- applying the analog input signal to the analog-to-digital converter to obtain a plurality of radix bits;
- and
- using the stored weighting factors to convert the radix bits into the digital output signal.
An analog-to-digital converter comprising:
- a plurality of current-mode pipeline stages that provide a plurality of radix bits according to an analog input signal;
- and
- a radix conversion circuit that receives the radix bits and converts them into a digital output signal according to a plurality of weighting factors derived by multiple linear regression analysis of a calibration signal.
Dependencies are inferred from the claim text.