Analog to digital converter comprising an asynchronous sigma del

Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder

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341159, H03M 300

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active

060879688

ABSTRACT:
An analog to digital converter comprises an asynchronous sigma-delta modulator generating an asynchronous duty cycle modulated square wave, sampling means to synchronously sample the asynchronous square wave and a decimating digital filter to convert the samples from the sampling means into a desired PCM-format.

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Shinichi Fukuda, "A New Digital PLL for the Class I Partial Response Channel," IEEE Transactions, Sep. 1996.
Engel Roza, "Poly-Phase Sigma-Delta Modulation," IEEE Transactions, Nov. 1997.
"Analog-to-Digital Conversion via Duty-Cycle Modulation", by Engel Roza, IEEE Transactions on Circuits and Systems, vol. 44, No. 11, Nov. 1997, pp. 907-914.
"The Application of Delta Modulation to Analog-to-PCM Encoding", by David J. Goodman, The Bell System Technical Journal, vol. 48, No. 2, Feb. 1969, pp. 321-343.
"Asynchronous Delta Sigma Modulation", by C.J. Kikkert et al., Proceedings of the IREE, vol. 36, Apr. 1975, pp. 83-87.
"Recursive Bitstream Conversion", by Engel Roza, IEEE Transactions on Circuits and Systems, vol. 40, No. 2, Feb. 1993, pp. 65-72.

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