Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1990-07-10
1992-09-15
Logan, Sharon D.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
H03M 300
Patent
active
051481669
ABSTRACT:
An improved modulator network for an interpolative oversampled (sigma-delta) analog-to-digital converter comprises a second-order modulator, which performs double integration of error between its digital output signal and its analog input signal, and a first-order modulator, which performs single integration of error between its digital output signal and an analog signal supplied thereto from the second-order modulator. The modulators supply their output signals to a digital error cancellation circuit which suppresses in the signal supplied to a decimation filter the quantization noise arising in the second-order modulator. The network exhibits significantly reduced sensitivity to the practical nonidealities that normally limit the resolution of analog-to-digital converters of this type, i.e., component matching, amplifier nonlinearity, finite gain, settling time, and signal dynamic range.
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Longo et al., "A 13 bit ISDN-band Oversampled ADC using Two-Stage Third Order Noise Shaping", IEEE Custom Integrated Circuits Conference, 1988.
IEEE International Symposium on Circuits and Systems, vol. 1 of 3, Portland Hilton, Portland, Oreg., May 8-11, 1989, pp. 247-249.
Davis Jr. James C.
General Electric Company
Logan Sharon D.
Snyder Marvin
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