Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2006-08-01
2009-12-08
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S155000
Reexamination Certificate
active
07629911
ABSTRACT:
A high-precision ΔΣ modulator reduces nonlinear noise due to the use of a multibit DAC and has little hardware and power consumption. A digital signal is DA converted and fed back to a subtraction circuit supplied with an analog signal. The DAC used in this feedback circuit uses a DAC (DWADAC) that includes a weighted pointer so that input digital signals are supplied in order to a plurality of segment elements that construct the DAC. In this DWADAC, the construction and number of the pointer is set based on the type and order of the filter disposed before the ADC.
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Hao San et al., “A Noise-Shaping Algorithm of Multi-bit DAC Nonlinearities in Complex Bandpass ΔΣAD Modulators”, IEICE TRANS. Fundamentals, vol. E87-A. No. 4, Apr. 2004, pp. 792-800.
Hao San et al., “An Element Rotation for Multi-bit, DAC Nonlinearities in Complex Bandpass ΔΣAD Modulators”, Proceedings of the 17thInternational Conference on VLSI Design (VLSID'04), 2004, pp. 151-156.
Hagiwara Hiroyuki
Kobayashi Haruo
Motozawa Atsushi
San Hao
Hogan & Hartson LLP
National University Corporation Gunma University
Nguyen Khai M
LandOfFree
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