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US 8,912,939 B2Granted
String DAC leakage current cancellation
AssigneeAnalog Devices Technology
InventorDennis A. Dempsey
Life of this patent
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Abstract
Embodiments of the present invention may provide a multi-string DAC with leakage current cancellation. A leakage cancellation circuit may be coupled to output node(s) of the—multi-string DAC. The leakage cancellation circuit may replicate leakage current present at the coupled output node(s) and generate a corresponding complementary signal, a leakage cancellation signal. The leakage cancellation signal may be injected into the coupled output node(s) to cancel (or reduce) the net impact of the leakage current.
Claims18
A string digital to analog converter (DAC), comprising:
- at least two impedance strings selectively coupled to each other via switches;
- and
- a leakage cancellation circuit coupled to an output node to replicate a leakage current present at the output node based on a detected voltage at the output node, to generate a complementary signal of the leakage current and to output the complementary signal.
A method, comprising:
- detecting a voltage signal at an output node in a multi-string DAC;
- replicating a leakage current at the output node based on the detected voltage;
- generating a cancellation signal that is complementary to the leakage current;
- and
- outputting the cancellation signal so that the leakage current and the cancellation signal destructively interfere.
2 more elements
Dependencies are inferred from the claim text.