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Abstract
This paper presents a 1st order sigma-delta-modulator with μ-law coding for
dynamic compression of audio signals. The nonlinearity is located in the
feedback loop of the modulator and does not require an internal multibit A/D
converter. The modulator requires just one opamp, one comparator, and a
minimum of digital logic to generate a four bit feedback and to ensure a
stable operation. The μ-law-function for μ=255 is approximated by a
standardised piecewise linear 16 segment function which is commonly used
in telecommunication. The chip has been designed and fabricated in a
standard 1.5μm n-well CMOS process, occupies a die area of 2 mm2, and has
been successfully tested. |
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eetop公众号
创芯大讲堂
创芯人才网
发表于 2007-1-12 22:57:21
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