Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1995-01-12
1998-11-17
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
333173, H03M 300
Patent
active
058382704
ABSTRACT:
An oversampled modulator (FIGS. 1 and 4) for operation in a frequency band from DC to a finyite frequency having a transfer function containing a plurality of zeros, at least two of which are disposed in the frequency band at a location other than at DC. The transfer function can have a plurality of zeros in the frequency band at a location other than at DC and at the same frequency. The second order version of the oversampled modulator has the transfer function: ##EQU1## where
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patent: 5392042 (1995-02-01), Pellon
patent: 5500645 (1996-03-01), Ribner et al.
Brandt et a.l., "A CMOS Oversampling A/D Converter with 12-Bit Resolution Rates above 1 MHZ," Sep. 25, 1990, pp. 1-5.
Candy et al., "Oversampling Methods for A/D and D/A Conversion," pp. 1-25, IEEE Press.
Ribner, "A Comparison of Modulator Networks for High-Order Oversampled .SIGMA..DELTA. Analog-to-Digital Converters," IEEE Transactions on Circuits and Systems, vol. 38, No. 2, Feb. 1991, pp. 145-159.
Brady III W. James
Donaldson Richard L.
Texas Instruments Incorporated
Williams Howard L.
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