Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2011-08-23
2011-08-23
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C375S242000
Reexamination Certificate
active
08004441
ABSTRACT:
A digital-to-analog (DAC) converter that includes a plurality of dynamically operated slave digital-to-analog (DAC) converters, each having a switched current mirror and a storage capacitor, and a static master digital-to-analog (DAC) converter in communication with the plurality of dynamically operated slave DAC converters, that distributes a current to at least one of the plurality of slave DAC converters such that voltage across the storage capacitor of the at least one slave DAC converter controls the switch current mirror so that the at least one slave DAC converter outputs currents that are equivalent to digital codes applied to the static master DAC converter. A ring counter is used to periodically refresh the charges on the storage capacitors that are lost by leakage. In addition to the periodic updates, an end user may perform immediate updates of selected slave DACs if necessary, via the ring counter.
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Beukema Troy J.
Kossel Marcel A.
Toifl Thomas
Weiss Jonas
Cantor & Colburn LLP
International Business Machines - Corporation
Kaufman Stephen
Mai Lam T
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