Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2007-11-20
2007-11-20
Mai, Lam T. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S155000, C704S222000
Reexamination Certificate
active
11388397
ABSTRACT:
The quantizers of delta sigma modulators in the signal processing systems described herein use a reduced set of comparators for quantization by predetermining and maintaining a maximum per cycle deviation d between a loop filter output signal VLF(t) and a predicted quantizer output signal qest. In at least one embodiment, a maximum quantizer level deviation d is defined in terms of a number of quantization levels. Thus, the number of comparators in a quantizer needed to quantize the quantizer input signal Vin(t) is based on the maximum quantizer level deviation d. In addition to using fewer comparators than available quantization output levels N, the quantizers can use an even number of comparators M, in contrast to comparable conventional reduced comparator ADC tracking quantizer designs using M+1 number of comparators, where N and Mare integers and M<N.
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International Search Report and Written Opinion for PCT/US2007/063660 dated Jul. 26, 2007.
Chambers Kent B.
Cirrus Logic Inc.
Hamilton & Terrile LLP
Mai Lam T.
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