System and method for dynamic element matching for delta sigma converters
AssigneeAnalog Devices, Inc.
InventorsAbhishek Bandyopadhyay, Preston S. Birdsong, Adam R. Spirer
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Abstract
Systems and methods for improving the efficiency of a rotational dynamic element matching (DEM) for Delta Sigma converters. In some implementations, the systems and methods are provided for reducing intersymbol interference (ISI) of a Delta Sigma converter. A delta sigma converter architecture can include multiple I-DACs, and the output from each I-DAC can vary from the other l-DACs. Techniques include decreasing mismatch among multiple l-DACs while improving efficiency of rotational dynamic element matching.
Claims20
A system for rotational dynamic element matching in a delta sigma converter, comprising:
- a rotational dynamic element matching (DEM) component configured to receive a data signal, wherein the rotational DEM component has a plurality of elements included in a barrel shifter, a start pointer, and a current pointer, wherein the start pointer and the current pointer point to elements in the same barrel shifter;
- wherein the current pointer shifts in a first direction when the data signal is positive and wherein the current pointer shifts in an opposite direction when the data signal is negative;
- and
- wherein the start pointer is jumped by a fixed value when the current pointer and the start pointer are equal and point to the same DEM element.
A system for converting digital signals into analog signals using sigma-delta modulation, comprising:
- a rotational dynamic element matching (DEM) component configured to receive a data signal, wherein the rotational DEM component has a plurality of elements included in a barrel shifter, a start pointer, and a current pointer, wherein the start pointer and the current pointer point to elements in the same barrel shifter;
- and
- a current digital-to-analog converter configured to convert a rotational DEM component output into an analog signal.
A method for dynamic element matching in a delta sigma converter, comprising:
- receiving a data signal at a rotational dynamic element matching component having a plurality of elements included in a barrel shifter, a start pointer, and a current pointer, wherein the start pointer and the current pointer point to elements in the same barrel shifter;
- shifting the current pointer in a first direction when the data signal is positive;
- shifting the current pointer in an opposite direction when the data signal is negative;
- and
- jumping the start pointer by a fixed value when the current pointer and the start pointer are equal and point to the same element in the barrel shifter.
Dependencies are inferred from the claim text.