Process and apparatus for conversion of an N-bit digital data wo

Details Process and apparatus for conversion of an N-bit digital data wo Process and apparatus for conversion of an N-bit digital data wo

1995-09-05

1997-06-24

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, H03M 150

Patent

active

056421176

ABSTRACT:
The process of converting a digital data word having N-bits into an analog voltage value includes decrementing or incrementing a counter word (B) having N-bits from a respective maximum or minimum value to form a series of decremented or incremented values, synchronizing the decrementing or incrementing of the counter word (B) to a time course of an analog reference voltage (U.sub.ramp) having a ramp-shaped time dependence, evaluating a logical connection function of the decremented or incremented values of the counter word (B) with a digital data word (A) to determine when one of the decremented or incremented values of the counter word (B) is equal to a complement of the digital data word (A) and setting an output analog voltage value (U.sub.column) equal to the analog reference voltage (U.sub.ramp) as soon as the decremented or incremented value of counter word (B) equal to the complement of data word (A) is reached.

REFERENCES:
patent: 3267429 (1966-08-01), Strohmeyer
patent: 3422423 (1969-01-01), Kaszynski et al.
patent: 3594765 (1971-07-01), Maurepas et al.
patent: 3648275 (1972-03-01), Bower
patent: 4139840 (1979-02-01), Mogi
R.G. Stewart, et al, "A 9V Polysilicon LCD with Integrated Gray-Scale Drivers", SID 90 Digest, 1990, pp. 319-322.

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