Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-02-07
2006-02-07
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000, C341S110000
Reexamination Certificate
active
06995701
ABSTRACT:
Multi-channel high resolution segmented resistor string digital-to-analog converters (DACs) suitable for realization in a single integrated circuit. The DACs incorporate a primary resistor string shared by all channels, and one or more additional pluralities of additional resistor strings for additional resolution. The primary resistor string may be buffered to limit the effect of loading thereon by the plurality of resistor strings coupled thereto. Current sources may also be coupled to the resistor strings coupled to the primary resistor string to also avoid loading of the primary resistor string. A trimmable resistor string of fewer bits may be connected to the primary resistor string for laser trimming. In the embodiment disclosed, a plurality of secondary and tertiary resistor strings are used, with leapfrogging minimizing the switches required.
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Churchill Simon Bevan
Mandyam Bharath
Shah Gaurang Arvind
Webb David
Blakely , Sokoloff, Taylor & Zafman LLP
Mai Lam T.
Maxim Integrated Products Inc.
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