Methods and apparatus for sigma-delta modulator having selectable OSR with optimal resonator coefficient
First Claim
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1. A programmable sigma-delta modulator (SDM) circuit, comprising:
- a first input to select a first one of a plurality of oversampling ratio (OSR) values;
a clock input to receive a clock signal; and
a module to provide a plurality of resonator coefficient values, each of the plurality of resonator coefficient values corresponding to one of the OSR values,wherein the SDM circuit includes a third-order single-stage configuration with an inverse-Chebyshev noise transfer function.
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Abstract
A programmable Sigma-Delta Modulator (SDM) includes a first input to select an oversampling rate (OSR), which has a corresponding resonator coefficient value to provide an optimal notch in the Noise Transfer Function (NTF).
36 Citations
1 Claim
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1. A programmable sigma-delta modulator (SDM) circuit, comprising:
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a first input to select a first one of a plurality of oversampling ratio (OSR) values; a clock input to receive a clock signal; and a module to provide a plurality of resonator coefficient values, each of the plurality of resonator coefficient values corresponding to one of the OSR values, wherein the SDM circuit includes a third-order single-stage configuration with an inverse-Chebyshev noise transfer function.
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Specification
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Current AssigneeIntrinsix Corp. (CEVA Incorporated)
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Original AssigneeIntrinsix Corp. (CEVA Incorporated)
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InventorsKozak, Mucahit, Petilli, Eugene Michael
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Primary Examiner(s)WILLIAMS, HOWARD L
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Application NumberUS11/745,094Publication NumberTime in Patent Office533 DaysField of Search341/143US Class Current341/143CPC Class CodesH03M 3/448 by removing part of the zer...H03M 3/498 Variable sample rate
