DAC with digitally-programmable gain and sync level generation

Details DAC with digitally-programmable gain and sync level generation DAC with digitally-programmable gain and sync level generation

1994-05-23

1996-10-29

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341136, H03M 166

Patent

active

055700900

ABSTRACT:
An integrated-circuit (IC) chip formed with a D/A converter (DAC) having a digitally-programmable circuit for setting the full-scale output range of the DAC by controlling its gain. The IC chip further includes analog sync level generator circuitry for driving computer graphics CRTs. The sync level generator circuitry is integrated with the DAC circuitry in such a way that the sync signal levels track changes made to the full-scale operating output range of the DAC and also track with changes in operating conditions such as varying temperature, supply voltage and RSET resistance in the DAC current control circuitry.

REFERENCES:
patent: 4168528 (1979-09-01), Comer
patent: 4607248 (1986-08-01), Botka et al.
patent: 4701694 (1987-10-01), Penney et al.
patent: 4982192 (1991-01-01), Murooka
patent: 5218364 (1993-06-01), Kumazawa et al.

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