Flash analog-to-digital converter with latching exclusive or gat

Details Flash analog-to-digital converter with latching exclusive or gat Flash analog-to-digital converter with latching exclusive or gat

1994-10-26

1998-02-24

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327 78, 327195, 327570, 326 52, H03K 524, H03K 3315

Patent

active

057215030

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: 4999528 (1991-03-01), Keech
patent: 5140188 (1992-08-01), Burns
patent: 5221866 (1993-06-01), Takatsu
patent: 5347175 (1994-09-01), Laug et al.
Corcoran et al., "A 400MHz 6b ADC", IEEE International Solid-State Circuit Conference, Feb. 24, 1984, 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 100MHz Full Nyquist Analog-to-Digital Converter", IEEE Journal of Solid State Circuits, vol. 23, No. 6, Dec. 1988, pp. 1334-1344.

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