Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-04-21
2008-03-11
Nguyen, Khai M. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S145000, C341S153000, C341S154000, C345S100000
Reexamination Certificate
active
07342527
ABSTRACT:
Disclosed is a digital-to-analog converting circuit including: a reference voltage generating circuit for outputting a plurality of reference voltages having voltage values that differ from one another; a data input control circuit for exercising control based upon a control signal so as to output either one of even-numbered bits or odd-numbered bits and then the other of the even-numbered bits or odd-numbered bits from a multiple-bit digital data signal input thereto; a decoder for successively selecting first and second voltages, inclusive of voltages that are identical, from among the plurality of reference voltages, which are output from the reference voltage generating circuit, in accordance with an output signal from the data input control circuit, and outputting the selected first and second voltages successively to the single terminal; and a differential amplifier, receiving the first and second voltages output from the decoder successively from the single terminal, for outputting from an output terminal an output voltage obtained by externally dividing the first and second voltages at a predetermined prescribed external ratio.
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patent: 2001-34234 (2001-02-01), None
Nec Corporation
Nguyen Khai M.
Sughrue & Mion, PLLC
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