Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1994-10-21
1997-02-18
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341154, H03M 178, H03K 1300
Patent
active
056045018
ABSTRACT:
There is disclosed a digital-to-analog converter including a resistor string having intermediate taps at resistor junctions as well as resistor-potential junctions. Switching transistors are coupled between a respective intermediate tap and an output node. Decode circuits are capable of switching at least two transistors to be in the on state at the same time to electrically couple more than one intermediate tap to the output node to produce at least one analog output. In one embodiment, one row select line can be energized simultaneously with at least two column select lines. Alternatively, at least two row select lines can be energized simultaneously with one column select line. A DAC in accordance with the present invention is suitable for fabrication in the form of a monolithic integrated circuit and requires less area while maintaining the same degree of resolution as prior art DACs. The DAC also may be used with successive approximation circuitry to provide an analog-to-digital converter.
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Gaffin Jeffrey A.
Jean-Pierre Peguy
Lucent Technologies - Inc.
Smith David L.
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