Multi-bit monotonic quantizer and linearized delta-sigma modulator based analog-to-digital and digital-to analog conversion
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United States of America Patent
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Jul 1, 2003
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app pub date -
Aug 26, 1999
filing date -
Aug 26, 1999
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Abstract
Multi-bit, monotonic quantizer and linearized delta-sigma modulator based analog-to-digital converter (ADC) modulators and digital-to-analog converter (DAC) modulators are disclosed. A folded monotonic quantizer provides tri-state to bi-state mapping such that three state bits may be utilized but are not required to be transported and stored. The multi-bit ADC and DAC modulators provide linearized, spurious free outputs that require less power and utilize lower oversampling ratios to provide wider bandwidths at high-performance, spurious-free dynamic ranges, making them ideally suitable for use in direct sampling receivers and direct digital transmitters.
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