Method and apparatus for extending the resolution of a sigma-del

Details Method and apparatus for extending the resolution of a sigma-del Method and apparatus for extending the resolution of a sigma-del

1994-04-04

1995-04-25

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341131, 341164, H03M 302, H03M 120, H03M 150

Patent

active

054103100

ABSTRACT:
A sigma-delta technique is used to generate a digital representation of the incoming analog signal amplitude. The integration stage of the converter holds an analog error term relative to the ratio of an incoming analog input signal to a reference voltage. The incoming analog signal is disconnected at the end of the conversion. The error term is monitored through a comparator as charge packets are applied to the input of the integration stage. The number of charge packets needed to have the error term cross zero provides information which can be used to extend the resolution of the analog to digital converter.

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Cheung, Peter Y. K. and See, Eric S. K., "A Comparison of Decimation Filter Architectures for Sigma-Delta A/D Converters." 1991 IEEE International Symposium on Circuits and Systems, vol. 3 of 5, (Jun. 1991); pp. 1637-1640.

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