Digital-to-analog converter with improved performance and method

Details Digital-to-analog converter with improved performance and method Digital-to-analog converter with improved performance and method

1992-03-30

1993-06-15

Logan, Sharon D.

Coded data generation or conversion

Converter compensation

341143, H03M 106, H03M 300

Patent

active

052203263

ABSTRACT:
A digital-to-analog converter (20) with improved performance includes an offset/scaler (23), a sigma-delta modulator (25), and an analog summing network (26). In one embodiment, the offset/scaler (23) scales an input signal by a predetermined amount, such as three-quarters, to compensate for nonlinearities in a transfer characteristic of the sigma-delta modulator (25). In another embodiment, the sigma-delta modulator (25) is a sufficiently-resolved sigma-delta modulator. The offset/scaler (23) provides an offset to the sufficiently-resolved sigma-delta modulator (25) sufficient to force a coarse bit thereof into an idle pattern.

REFERENCES:
patent: 4897856 (1990-01-01), Cukier et al.
patent: 5057840 (1991-10-01), Ledzius et al.

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