Direct current offset calibration for digital-to-analog conversion
AssigneeQUALCOMM Incorporated
InventorsBeomsoo PARK, Ashok SWAMINATHAN, Negar RASHIDI
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Abstract
Certain aspects of the present disclosure provide techniques and apparatus for digital-to-analog conversion. An example apparatus generally includes a digital-to-analog converter (DAC), an incremental analog-to-digital converter (IADC) having a first input coupled to a first output of the DAC, and a controller coupled to the DAC and the IADC. The controller is configured to determine a direct current (DC) offset associated with the DAC using the IADC and control a mission-mode digital input signal of the DAC based on the DC offset.
Claims20
An apparatus for digital-to-analog conversion, comprising:
- a digital-to-analog converter (DAC);
- an incremental analog-to-digital converter (IADC) having a first input coupled to a first output of the DAC;
- and
- a controller coupled to the DAC and the IADC, wherein the controller is configured to:
- determine a direct current (DC) offset associated with the DAC using the IADC;
- and
- control a mission-mode digital input signal of the DAC based on the DC offset.
A method for digital-to-analog conversion, comprising:
- generating, via a digital-to-analog converter (DAC), a first output current based on a calibration-mode digital input signal;
- generating, via an incremental analog-to-digital converter (IADC), a first digital output signal based on the first output current;
- determining a direct current (DC) offset associated with the DAC based on the first digital output signal;
- and
- adjusting a mission-mode digital input signal for the DAC based on the DC offset.
An apparatus for digital-to-analog conversion, comprising:
- a digital-to-analog converter (DAC) including a first output and a second output;
- and
- an incremental analog-to-digital converter (IADC) including a switch circuit, a first input selectively coupled to the first output of the DAC or the second output of the DAC via the switch circuit, and a second input selectively coupled to the first output of the DAC or the second output of the DAC via the switch circuit.
Dependencies are inferred from the claim text.