Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2006-09-12
2006-09-12
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S155000
Reexamination Certificate
active
07106239
ABSTRACT:
A time-analog-to-digital converter (TAD) utilizes a time-to-digital approach for analog-to-digital conversion. The TAD includes two voltage-to-delay converters (VDCs), e.g., CMOS inverter chains, in order to increase the dynamic range of the TAD. Each VDC can handle a different range of input voltages. Comparators compare the input signal voltage to reference voltages corresponding to the different ranges of input voltage and a selector selects one of the VDC line outputs based on the range in which the input signal lies. A filter estimates the input signal voltage from a delay signal from the selected output.
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Watanabe, Takamot:An All-Digital Analog-to-Digital Converter With 12-μ V/LSB Using Moving-Average Filtering: IEEE Journal of Solid-State Circuits, vol. 38, No. 1 (Jan. 2005)pp. 120-125.
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Barnie Rexford
Brown Charles D.
Jenckes Kenyon S.
Nguyen Khai
Qualcomm Incorporated
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