A 113-dB DSD audio ADC using a density-modulated dithering scheme

A stereo audio delta-sigma A/D converter is implemented to support both the standard pulse-code modulation audio and the direct stream digital (DSD) output format. It provides all the standard audio rates up to 192 kHz. A sixth-order, single-bit modulator is employed to achieve the noise performance...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2003-01, Vol.38 (1), p.114-119
Main Authors: Wang, C.B., Ishizuka, S., Liu, B.Y.
Format: Article
Language:English
Subjects:
Analog-digital conversion
CMOS process
Converters
Delta modulation
Digital modulation
Dithering
Dynamic range
Format
Harmonic distortion
Modulation
Modulators
Noise levels
Pulse modulation
Pulse width modulation converters
Stability
Streaming media
Total harmonic distortion
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Summary:A stereo audio delta-sigma A/D converter is implemented to support both the standard pulse-code modulation audio and the direct stream digital (DSD) output format. It provides all the standard audio rates up to 192 kHz. A sixth-order, single-bit modulator is employed to achieve the noise performance as well as the bitstream output required by the DSD format. A novel density-modulated dithering scheme is utilized to dramatically reduce the tone level in the signal band without compromising the stability of the high-order modulator. This analog-to-digital converter achieves a dynamic range of 113 dB and a total harmonic distortion +N of 105 dB. It is fabricated in a 0.35-/spl mu/m CMOS process with a die size of 10.5 mm/sup 2/.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2002.806260