Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1994-08-18
1998-11-24
DeBoer, Todd E.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341144, 341154, H03M 162
Patent
active
058413847
ABSTRACT:
A digital-to-analog converter (DAC) for generating a high-precision analog output signal corresponding to a non-linear function, such as a sine function, of a digital input quantity, without the need for large numbers of precision current generators. Binary weighted current sources provide currents that, when selectively combined to provide a single output current, are approximately equivalent to the non-linear function of the digital input quantity, and an interpolation network provides an interpolation current that is added to the output current. The interpolation network may be selected to provide linear or non-linear interpolation between output current values. In other disclosed embodiments, multiple interpolation networks are used, either to provide different interpolation techniques for different ranges of input values, or to be connected effectively in series to provide for still greater accuracy without using additional current sources. In accordance with a related technique, the weighted current sources are derived from a relatively small number of identical current sources. Some of the identical current sources are connected to binary division networks to provide successively smaller binary fractions of the identical currents, and a summing network selectively combines the identical currents and the binary fractions of the identical currents, to provide multiple outputs weighted as needed for the non-linear DAC.
REFERENCES:
patent: 4338592 (1982-07-01), Wilensky
patent: 4396907 (1983-08-01), Wintzer et al.
patent: 5243347 (1993-09-01), Jackson et al.
patent: 5283580 (1994-02-01), Brooks et al.
Herman Ray Michael
McKay Anthony Lenardo
Yang Neng-Tze
Alkov Leonard A.
Deboer Todd E.
Denson-Low Wanda K.
Hughes Electronics
Lindeen III Gordon R.
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