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US 2009/0153380 A1Published application
Current compensation for digital-to-analog converter
AssigneeAtmel Corporation
InventorsThierry Soude, Michel Cuenca, Didier Davino, Daniel Payrard, Frederic Demolli
Life of this patent
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Abstract
A current compensation circuit and an optimized current compensation circuit are disclosed for a Parallel Resistors Architecture (PRA) digital-to-analog converter (DAC). The circuits are used to balance code dependent current consumption of the PRA-DAC.
Claims21
A circuit, comprising:
- a weighted resistive network including a first set of resistive elements;
- a switch network coupled to the weighted resistive network and operable to select one or more resistive elements from the first set of resistive elements in response to an input signal;
- and
- a digital-to-analog converter (DAC) subcircuit coupled to the weighted resistive network,
- wherein the circuit is operable to generate a code dependent compensation current from the input signal that balances a code dependent current consumption from a reference voltage of the first set of resistive elements, such that a sum of the code dependent compensation current and the code dependent current consumption from the reference voltage is substantially independent of the code and substantially equal to a maximum current consumption from the reference voltage of the first set of resistive elements before compensation.
2 more elements
A system comprising:
- a digital-to-analog converter (DAC) having a native code dependent current consumption;
- and
- a compensation circuit coupled to the DAC and operable for configuring a number of resistive elements to generate a code dependent current consumption for balancing the native code dependent current consumption to provide a code independent current consumption within the DAC that is substantially equal to a maximum current consumption within the DAC.
Dependencies are inferred from the claim text.