Current sensing and background calibration to match two...

Details Current sensing and background calibration to match two... Current sensing and background calibration to match two...

2011-07-12

2011-07-12

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S155000

Reexamination Certificate

active

07978105

ABSTRACT:
In one embodiment, a first resistor ladder includes a first voltage across the first resistor ladder. A second resistor ladder includes a second voltage across the second resistor ladder. A third resistor ladder includes a third voltage across the third resistor ladder. The calibrator receives the first voltage and third voltage and adjusts a current through the third resistor ladder to adjust the third voltage based on the received first voltage and third voltage. A buffer is configured to provide buffering for the third resistor ladder from the second resistor ladder. The third voltage of the third resistor ladder is stable even though the second voltage of the second resistor ladder is changing.

REFERENCES:
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patent: 6956512 (2005-10-01), San et al.
patent: 7046179 (2006-05-01), Taft et al.
patent: 7119730 (2006-10-01), San et al.
patent: 7321327 (2008-01-01), San et al.
patent: 7358876 (2008-04-01), Oo et al.

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