Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2011-03-08
2011-03-08
Williams, Howard (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C323S316000, C327S543000
Reexamination Certificate
active
07903011
ABSTRACT:
A differential current-mode sigma-delta digital-to-analog converter (SD DAC) and a method for generating positive and negative reference voltages in a sigma-delta digital analog converter are described. The SD DAC includes a low pass filter (LPF) having a first and second input. The SD DAC further includes a first resistance and a second resistance coupled together at a common node. The first resistance may be coupled to the first input of the LPF and the second resistance may be coupled to the second input of the LPF. Additionally, the SD DAC includes a current supply and a switching network for supplying current from the current supply to the first and second resistances. The current supply and the resistances operate to generate a first voltage and a second voltage at the first and second inputs of the LPF.
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Shumaker & Sieffert P.A.
Williams Howard
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