Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2011-06-07
2011-06-07
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S144000
Reexamination Certificate
active
07956782
ABSTRACT:
In general, this disclosure is directed to a differential current-mode sigma-delta digital-to-analog converter (SD DAC) with improved accuracy and reduced offset and gain errors. In one example, the SD DAC may include a current source configured to provide a differential current. The SD DAC may further include a switching network configured to adjust a polarity of the differential current according to a bit within the bit-stream to produce a differential current signal. The SD DAC may further include a current-to-voltage converter configured to convert the differential current signal to a differential voltage signal. In additional examples, the differential current source may include one or more source degeneration resistances. In further examples, the current-to-voltage converter may include a fully-differential operational amplifier. A low pass filter may be included within the current-to-voltage converter and/or coupled to the output of the current-to-voltage converter.
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Honeywell International , Inc.
Jean-Pierre Peguy
Shumaker & Sieffert P.A.
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