Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1997-05-05
1999-03-30
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
327199, H03K 524, H03M 136, H03M 714
Patent
active
058894870
ABSTRACT:
The number of input latching comparators in a flash analog-to-digital converter is significantly reduced by merging the input latching function into exclusive OR gates used in the converter's decoding section. A latching exclusive OR gate used for this purpose employs resonant tunneling diodes as the latching devices, with hysteresis and impedance elements connected to ensure that the gate latches in a logic state that corresponds to the input analog signal. The latching logic gates operate in a current mode, enabling updated logic states to be latched in response to a periodic clock signal.
REFERENCES:
patent: 5140188 (1992-08-01), Burns
patent: 5721503 (1998-02-01), Burns et al.
Cocoran et al., "A 400MHz 6b ADC", IEEE International Solid-State Circuit Conference, Feb. 24, 1994, pp. 294-296.
van de Grift et al., "An 8b 50MHz Video ADC with Folding and Interpolation Techniques", IEEE International Solid-State Circuits Conference, 1987, pp. 94, 95, 354.
Van de Plassche, "An 8-bit 100-MHz Full Nyquist Analog-to-Digital Converter", IEEE Journal of Solid State Circuits, vol. 23, No. 6, Dec. 1988, pp. 1334-1344.
Burns Lawrence M.
Stanchina William E.
Gudmestad Terje
Hughes Electronics Corporation
Jean-Pierre Peguy
Sales M. W.
Williams Howard L.
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