Multi-bit monotonic quantizer and linearized delta-sigma modulator based analog-to-digital and digital-to analog conversion
OwnerDuane L. Abbeyinventor
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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.
Claims20
An analog-to-digital converter modulator, comprising:
- means for modulating an analog input signal;
- means for quantizing an output received from said modulating means;
- means, coupled to said quantizing means, for mapping an output of said quantizing means from a three state code to a two state code;
- means, coupled to said mapping means, for delaying an output of said quantizing means;
- and
- means for providing a linearized feedback signal from said delaying means to said modulating means wherein an analog signal is converted to a digital signal having enhanced linearity and being represented by a predetermined number of bits.
A digital-to-analog converter modulator, comprising:
- means for modulating a digital input signal being represented by a predetermined number of bits;
- means for mapping an output of said modulating means from a two state signal to a three state signal;
- and
- at least one or more means for converting a three state signal output from said mapping means from a digital signal to an analog signal wherein one converting means is provided per each of the predetermined number of three state bits.
An analog-to-digital converter, comprising:
- means for receiving an analog input signal;
- means for quantizing the analog input signal into a tri-state signal at a predetermined sample rate;
- and
- means for mapping the tri-state signal into a bi-state signal whereby an output signal is provided, the output signal being represented by a predetermined number of bits.
Dependencies are inferred from the claim text.