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US 2010/0164765 A1Published application
DAC calibration circuits and methods
OwnerMasaya Miyahara, Hasnain Lakdawalainventors
Life of this patent
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Abstract
Provided is a DAC with tuning circuitry in accordance with some embodiments for tuning current sources in the DAC. The DAC may be used for a sigma-delta converter in some embodiments.
Claims19
A chip, comprising:
- a digital to analog converter having current sources;
- and
- a tuning circuit having an integrator to form an integral feedback loop to tune the current sources to reduce the errors between them.
A method, comprising:
- tuning a first and a second current source in a sigma-delta converter DAC by adjusting the current for one of the first and second sources in response to zeroing the error between the sources using a proportional integral feedback loop.
A system, comprising:
- a host processor;
- and
- a wireless interface card having a transmitter, the transmitter including a sigma-delta converter including a digital to analog converter having current sources, and a tuning circuit having an integrator to form an integral feedback loop to tune the current sources to reduce the errors between them.
Dependencies are inferred from the claim text.