Residual error sampling and correction circuits in inl dac calibrations
AssigneeQUALCOMM Incorporated
InventorsTongyu SONG, Derui KONG
Life of this patent
Estimating the term…
Abstract
In an aspect of the disclosure, a method and an apparatus are provided for calibrating a DAC. The apparatus calibrates a first DAC element, provides a residual current error resulting from the calibration, the residual current error being a difference between a calibrated current source of the first DAC element and a reference current source, stores the residual current error of the calibrated first DAC element in a first memory module using at least first and second storage elements coupled to a differential amplifier, and calibrates a second DAC element using the stored residual current error.
Claims22
An apparatus for calibrating a digital-to-analog converter (DAC), comprising:
- a current comparator module configured to calibrate a first DAC element;
- a charging module configured to provide a residual current error resulting from the calibration, the residual current error being a difference between a calibrated current source of the first DAC element and a reference current source;
- and
- a first memory module comprising at least first and second storage elements coupled to a differential amplifier, the first memory module configured to store the residual current error using the at least first and second storage elements and to provide the stored residual current error for calibration of a second DAC element.
A method of calibrating a digital-to-analog converter (DAC), comprising:
- calibrating a first DAC element;
- providing a residual current error resulting from the calibration, the residual current error being a difference between a calibrated current source of the first DAC element and a reference current source;
- storing the residual current error of the calibrated first DAC element in a first memory module using at least first and second storage elements coupled to a differential amplifier;
- and
- calibrating a second DAC element using the stored residual current error.
An apparatus for calibrating a digital-to-analog converter (DAC), comprising:
- means for calibrating a first DAC element;
- means for providing a residual current error resulting from the calibration, the residual current error being a difference between a calibrated current source of the first DAC element and a reference current source;
- means for storing the residual current error of the calibrated first DAC element using at least first and second storage elements coupled to a differential amplifier;
- and
- means for calibrating a second DAC element using the stored residual current error.
Dependencies are inferred from the claim text.