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US 7,420,493 B2Granted
Extended range delta-sigma modulator and delta-sigma power converter
AssigneeTexas Instruments Incorporated
InventorJames R. Hochschild
Life of this patent
Estimating the term…
Abstract
Devices, systems, and methods for providing delta-sigma modulation in conjunction with analog-to-digital or digital-to-analog signal conversion are disclosed. The delta-sigma modulator and delta-sigma converter include dynamically-scalable coefficients, which, at relatively low signal amplitudes, allow the delta-sigma modulator and delta-sigma converter to modulate the signals using a first noise transfer function and, at relatively greater signal amplitudes, allow the delta-sigma modulator and delta-sigma converter to modulate the signals using a second noise transfer function.
Claims20
A dynamically-controllable delta-sigma modulating device for providing a range of output amplitudes to at least one of an analog-to-digital converter and a digital-to-analog converter, the modulating device comprising:
- a plurality of summing circuits disposed serially;
- a quantizer block disposed after a last of the plurality of summing circuits, the quantizer block having a feedback loop to each summing circuit of said plurality of summing circuits;
- a plurality of integrator circuits, each of the plurality of integrator circuits being disposed between successive summing circuits of said plurality of summing circuits and between the last of the plurality of summing circuits and said quantizer block;
- a first plurality of multiplier circuits, each of the first plurality of multiplier circuits being disposed between each of the plurality of integrator circuits and an adjacent summing circuit of said plurality of summing circuits and between a last of said plurality of integrator circuits and said quantizer block, each multiplier circuit of said first plurality of multiplier circuits having a first dynamically-scalable coefficient;
- a first resonator feedback loop providing a first resonator feedback via a first resonator coefficient multiplier circuit having a second dynamically-scalable coefficient;
- and
- a second resonator feedback loop providing a second resonator feedback via a second resonator coefficient multiplier circuit having a third dynamically-scalable coefficient;
- wherein each of the dynamically-scalable coefficients can be altered to provide a desired noise transfer function within a band of interest.
5 more elements
A delta-sigma modulator having a range of output amplitudes, the converter comprising:
- a low-pass filter;
- and
- a dynamically-controllable delta-sigma converter, the converter comprising:
- a plurality of summing circuits disposed serially;
- a quantizer block disposed after a last of the plurality of summing circuits, the quantizer block having a feedback loop to each summing circuit of said plurality of summing circuits;
- a plurality of integrator circuits, each integrator circuit of the plurality of integrator circuits being disposed between successive summing circuits of said plurality of summing circuits and between the last of the plurality of summing circuits and said quantizer block;
- a first plurality of multiplier circuits, each multiplier circuit of the first plurality of multiplier circuits being disposed between each integrator circuit of the plurality of integrator circuits and an adjacent summing circuit of said plurality of summing circuits and between a last integrator circuit of said plurality of integrator circuits and said quantizer block, each multiplier circuit of said first plurality of multiplier circuits having a first dynamically-scalable coefficient;
- a first resonator feedback loop providing a first resonator feedback via a first resonator coefficient multiplier circuit having a second dynamically-scalable coefficient;
- and
- a second resonator feedback loop providing a second resonator feedback via a second resonator coefficient multiplier circuit having a third dynamically-scalable coefficient;
- wherein each of the dynamically-scalable coefficients can be altered to provide a desired noise transfer function within a band of interest.
8 more elements
A dynamically-controllable delta-sigma converter having a range of output amplitudes for a delta-sigma modulator, the converter comprising:
- a plurality of summing circuits disposed serially;
- a quantizer block disposed after a last of the plurality of summing circuits, the quantizer block having a feedback loop to each summing circuit of said plurality of summing circuits;
- a plurality of integrator circuits, each integrator circuit of the plurality of integrator circuits being disposed between successive summing circuits of said plurality of summing circuits and between the last of the plurality of summing circuits and said quantizer block;
- a first plurality of multiplier circuits, each multiplier circuit of the first plurality of multiplier circuits being disposed between each integrator circuit of the plurality of integrator circuits and an adjacent summing circuit of said plurality of summing circuits and between a last integrator circuit of said plurality of integrator circuits and said quantizer block, each multiplier circuit of said first plurality of multiplier circuits having a first dynamically-scalable coefficient;
- a first resonator feedback loop providing a first resonator feedback via a first resonator coefficient multiplier circuit having a second dynamically-scalable coefficient;
- and
- a second resonator feedback loop providing a second resonator feedback via a second resonator coefficient multiplier circuit having a third dynamically-scalable coefficient;
- wherein each of the dynamically-scalable coefficients can be altered to provide a desired noise transfer function within a band of interest.
5 more elements
A method of dynamically-controlling delta-sigma signal modulation of at least one of a delta-sigma analog-to-digital or a delta-sigma digital-to-analog converter, to provide an extended range of output amplitudes, the method comprising:
- sampling an input signal amplitude;
- comparing the input signal amplitude to a threshold signal amplitude;
- and
- dynamically-altering a delta-sigma noise transfer function;
- wherein altering the delta-sigma noise transfer function includes altering at least one of a first coefficient and a second coefficient, wherein the first coefficient is applied to an output from each of a plurality of integrators of the at least one delta-sigma analog-to-digital or delta-sigma digital-to-analog converter and the second coefficient is applied to an output from at least one of a plurality of integrators that is fed back to another of the plurality of integrators;
- and
- wherein the method includes transmitting normal mode signals to dynamically scale the first and second coefficients when the amplitude of the input signal does not exceed a threshold value, and transmitting extended range mode signals to dynamically scale said first and second coefficients when the amplitude of the input signal exceeds the threshold value.
4 more elements
Dependencies are inferred from the claim text.