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US 2003/0194047 A1Published application
Multiple-output counters for analog-to-digital and digital-to-analog conversion
AssigneeNone recorded
InventorCharles Douglas Murphy
Life of this patent
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AssigneeNone recorded
InventorCharles Douglas Murphy
Estimating the term…
A machine used for digital counting which can provide multiple output counts. The machine is particularly useful in analog-to-digital (A/D) converters and in digital-to-analog (D/A) converters. The multiple output counts can change in different directions or in the same direction, and are generated using shared circuitry. The invention exploits properties of counting systems to allow A/D and D/A conversions in convenient digital number formats or in multiple different formats. The invention can be used in integrating converters to help eliminate errors such as comparator offset and dielectric absorption while converting and to increase the conversion rate.
A machine used for digital counting, comprising:
The machine of claim 11 further including means for complementing the sign bit of a representation of a value of said first output count to obtain the sign bit for the representation of the corresponding value of said second output count.
Dependencies are inferred from the claim text.
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Output circuits: with parallel read-out
Pulse technique
Term end not estimated
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1. Field of Invention
In the drawings, closely related figures have the same number but different alphabetic suffixes.
FIG. 1 shows a table of 4-bit signed integers in three systems of representation similar to that in “The Art of Electronics”, second edition on page 477.
FIG. 2A shows a preferred embodiment of the invention with simultaneous counting up and counting down in four-bit two's complement.
10 a two's complement upward counter
12 a first output
14 a second output