Method and structure for providing a digitally controlled...

Details Method and structure for providing a digitally controlled... Method and structure for providing a digitally controlled...

1998-04-21

2001-02-13

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S147000

Reexamination Certificate

active

06188343

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to digital voltage control. In particular, the present invention relates to using digital-to-analog converters to perform a power series approximation of a non-linear function of an input signal.
SUMMARY OF THE INVENTION
The present invention provides a method and a circuit for creating a non-linear function of an input voltage, based on a power series approximation. In one embodiment, a circuit of the present invention includes: (a) a first multiplying digital-to-analog converter (mDAC) receiving a reference voltage and a digital value, to provide a first output voltage proportional to the input reference voltage and the digital value; (b) a second mDAC receiving the first output voltage and the same digital value to provide a second output voltage proportional to the reference voltage and a square of said digital value; and (c) a summing circuit receiving the first and second output voltages and the reference voltage to provide a weighted sum of these voltages. Weighting factors can be provided by fixed gain amplifiers for each of the reference voltage, and the first and second output voltages, to create coefficients to better approximate the non-linear function. Additional higher order terms can be obtained by similarly cascading additional mDACs.
The present invention is better understood upon consideration of the detailed description below and the accompanying drawings.


REFERENCES:
patent: 3183342 (1965-05-01), Wortzman
patent: 5483151 (1996-01-01), Yamashita

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