Current comparator offset calibration in digital-to-analog converter calibrations
AssigneeQUALCOMM Incorported
InventorsTongyu SONG, Derui KONG
Life of this patent
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Abstract
In an aspect of the disclosure, a method and an apparatus are provided for calibrating a current comparator circuit associated with a DAC element. The apparatus receives an output of a current comparator module, determines calibration data using a finite state machine (FSM) based on the output of the current comparator module, and reduces an offset current at an input of the current comparator module based on the calibration data from the FSM.
Claims20
An apparatus for calibrating a digital-to-analog converter (DAC) element, comprising:
- a current comparator module coupled to the DAC element, the current comparator module configured to calibrate a current source corresponding to the DAC element;
- and
- a calibration module coupled to the current comparator module and configured to reduce an offset current of the current comparator module, the calibration module comprising:
- a finite state machine (FSM) configured to receive feedback from the current comparator module and to generate calibration data based on the feedback, and
- a comparator DAC configured to reduce an offset current of the current comparator module based on the calibration data from the FSM.
A method of calibrating a digital-to-analog converter (DAC) element:
- receiving an output of a current comparator module;
- determining calibration data using a finite state machine (FSM) based on the output of the current comparator module;
- and
- reducing an offset current at an input of the current comparator module based on the calibration data from the FSM.
An apparatus for calibrating a digital-to-analog converter (DAC) element:
- means for receiving an output of a current comparator module;
- means for determining calibration data using a finite state machine (FSM) based on the output of the current comparator module;
- and
- means for reducing an offset current at an input of the current comparator module based on the calibration data from the FSM.
Dependencies are inferred from the claim text.