Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2011-08-16
2011-08-16
Williams, Howard (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
Reexamination Certificate
active
07999710
ABSTRACT:
A relatively low frequency chopping operation is applied to a delta-sigma ADC to reduce DC offsets resulting from non-ideal component operation. Sequential chopping takes place outside a closed loop and may include an inverted polarity feedback for a part of the chopping period. Nested chopping involves chopping within the closed loop, and may include an inverted polarity feedback and a time shift. The feedback compensation for sequential and nested chopping permits the correct polarity feedback to be provided at the desired time in conjunction with sampling and quantization events. Integrating capacitor(s) may be swapped in relative polarity during nested chopping to preserve residual conversion information for the desired polarity. The ADC operation is non-temperature dependent and avoids modification to the useful signal, resulting in higher accuracy.
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Bakkaloglu Bertan
Lum-Shue-Chan Brian Phillip
Matthews Wallace Edward
Brady III Wade J.
Patti John J.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
Williams Howard
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