Dual sense amplifier structure for video RAMDACs

Details Dual sense amplifier structure for video RAMDACs Dual sense amplifier structure for video RAMDACs

1991-05-01

1993-05-25

Heyman, John S.

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36523003, 36523005, 36523008, 36518905, 365201, G11C 1300

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active

052146081

ABSTRACT:
A dual sense amplifier structure and a method are provided in a RAMDAC, to allow the video path to be probed digitally during testing. Each of the two sets of sense amplifiers in the dual sense amplifier structure can be individually enabled to provide the same output data to both a color value register accessible over a data port and the digital-to-analog converters for interface with an analog display. In one embodiment, the sense amplifiers which provide color values to a data port interfaced with the CPU are implemented by simpler circuits than the sense amplifiers which used to provide the color values to the DACs.

REFERENCES:
patent: 4868548 (1989-09-01), Gelvin
patent: 4905189 (1990-02-01), Brunolli
patent: 4954987 (1990-09-01), Auvinen et al.
patent: 4990915 (1991-02-01), Kondoh et al.
patent: 5001671 (1991-03-01), Koo et al.

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