Digital-to-analog converter which uses a sigma-delta modulation

Details Digital-to-analog converter which uses a sigma-delta modulation Digital-to-analog converter which uses a sigma-delta modulation

1996-08-08

1998-07-28

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

341143, H03M 302

Patent

active

057867798

ABSTRACT:
A digital-to-analog (D/A) converting apparatus for converting digital data to an analog signal is provided. Specifically, the apparatus contains a sampling rate converting circuit, an interpolator, a digital sigma-delta demodulation circuit, and an analog D/A converter. The converting circuit inputs and converts the digital data into sampled digital data. Then the interpolator interpolates the sampled digital data to produce interpolated data. Also, the interpolator has an infinite impulse response (IIR) filter which performs an IIR filtering operation based on the sampled digital data to produce the interpolated data. The demodulation circuit inputs the interpolated data, performs a sigma-delta demodulation operation on the interpolated data, and outputs corresponding demodulated data. Then, the analog D/A converter converts the demodulated data to the analog signal. By using the interpolator and the demodulation circuit, the structure of the converting apparatus is relatively simple. Accordingly, the apparatus can be easily integrated to produce a compact device.

REFERENCES:
patent: 5489903 (1996-02-01), Wilson et al.
patent: 5512895 (1996-04-01), Madden et al.
patent: 5654711 (1997-08-01), Fujimori

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