Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1992-11-06
1994-05-03
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341119, H03M 114
Patent
active
053091574
ABSTRACT:
An analog to digital converter (ADC) includes a primary folder circuit for mapping an analog input voltage to a folder output voltage, a voltage reference circuit for generating a plurality of reference voltages and a first array of comparators. Each of the comparators in the first comparator array includes a first input terminal to which is applied the ADC's analog input voltage and a second input terminal held at one of the reference voltages. The outputs of the comparators correspond to most significant bits of a digital representation of the analog input voltage. A plurality of reference folder circuits convert a plurality of the reference voltages into a corresponding plurality of comparison voltages. The ADC also includes a second array of comparators, each of which includes a first input terminal to which is applied the primary folder's output voltage and a second input terminal held at one of the plurality of comparison voltages. The outputs of the comparators of the second array of comparators correspond to the least significant bits of a digital representation of the analog input voltage.
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"A Monolithic 8-Bit Video A/D Converter"; R. Van de Grift et al.; IEEE Journal of Solid-State Circuits, vol. SC-19, No. 3, Jun. 1984; pp. 374-378.
"An 8.noteq.bit Video ADC Incorporating Folding and Interpolation Techniques"; R. Van de Grift et al.; IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987; pp. 944-953.
National Semiconductor Corporation
Williams Howard L.
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