H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 1/12 (2006.01) H03M 3/04 (2006.01)
Patent
CA 2076098
RD-21541 HIGH-ORDER, PLURAL-BIT-QUANTIZATION SIGMA-DELTA MODULATORS USING SINGLE-BIT DIGITAL-TO-ANALOG CONVERSION FEEDBACK Abstract of the Disclosure A high-order sigma-delta modulator has a single feedback loop including a linear network and a quantizer, which quantizer comprises a plural-bit analog-to-digital converter, a digital comparator and a single-bit digital-to-analog converter. The linear network comprises a cascade of integrators, a second-order resonator, a cascade of second-order resonators or a cascade of second-order resonators with an additional integrator. The loop behaves much the same as a conventional single-feedback-loop, one- bit sigma-delta modulator, inasfar as the feedback signal is concerned. However, a plural-bit preliminary output signal is available, so the truncation error can be determined. The truncation error is cancelled in the ultimate output signal from the high-order sigma-delta modulator, using additional digital circuitry having the a transfer function analogous to the overall transfer function for input signal of the cascade connection of the linear network, plural- bit analog-to-digital converter in the quantizer, and any scaling circuitry therein or thereafter.
Company General Electric
Craig Wilson And Company
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