Delta-Sigma DAC

Details Delta-Sigma DAC Delta-Sigma DAC

2008-03-18

2008-03-18

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000

Reexamination Certificate

active

07345608

ABSTRACT:
A Delta-Sigma DAC is provided, comprising an interpolator, a Delta-Sigma modulator, a FIR filter and an analog filter. The interpolator oversamples a n-bit digital signal to generate a n-bit oversampled signal. The Delta-Sigma modulator coupled to the output of interpolator shapes the n-bit oversampled digital signal to generate a shaped digital signal. The FIR filter coupled to the Delta-Sigma modulator filters the shaped digital signal to generate an analog audio signal. The analog filter coupled to the FIR filter amplifies the analog audio signal to generate a audible signal.

REFERENCES:
patent: 4181895 (1980-01-01), Yoshida
patent: 4975963 (1990-12-01), Liberman
patent: 5537081 (1996-07-01), Naokawa et al.
patent: 6323795 (2001-11-01), Yang et al.
patent: 6531973 (2003-03-01), Brooks et al.
patent: 6816097 (2004-11-01), Brooks et al.
patent: 6950049 (2005-09-01), Brooks et al.

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