Noise limitation of a signal dependent multibit digital to analog signal conversion
AssigneeTexas Instrument Incorporated
InventorsSandeep Oswal, Jagannathan Venkataraman
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Abstract
Several methods and a system of noise limitation of a signal dependent multibit digital to analog signal conversion are disclosed. An exemplary embodiment provides a method that includes receiving an output of a multibit analog to digital circuit of a continuous time sigma delta converter. The method further includes limiting a noise generation by adaptively selecting a digital to analog converter element out of a plurality of digital to analog converter elements in accordance with an input signal magnitude. In addition, the method includes implementing a selected digital to analog converter element to generate an analog signal.
Claims20
A method, comprising:
- receiving an output of a multibit analog to digital converter circuit of a continuous time sigma delta converter;
- limiting a noise generation by adaptively selecting a digital to analog converter element out of a plurality of digital to analog converter elements in accordance with an input signal magnitude;
- and
- implementing a selected digital to analog converter element to generate an analog signal.
A system, comprising:
- an integrator circuit of a continuous time sigma delta converter;
- a multibit analog to digital converter circuit coupled to the integrator circuit, wherein the multibit analog to digital circuit generates a digital signal when it receives an integrator signal from the integrator circuit;
- a digital to analog converter circuit coupled to the multibit analog to digital converter circuit and the integrator circuit, wherein a digital to analog converter element is adaptively selected out of a plurality of digital to analog converter elements in accordance with a digital signal magnitude to limit a noise generation.
A method comprising:
- using between two bits and sixteen bits of a multibit analog to digital converter circuit to generate a digital output;
- receiving the digital output in a digital to analog converter;
- limiting a noise generation by adaptively selecting a digital to analog converter element comprised of a capacitor out of a plurality of digital to analog converter elements in accordance with an input signal magnitude, wherein each capacitor is comprised of substantially the same capacitance;
- implementing a selected digital to analog converter element to generate an analog signal;
- decoupling an extraneous digital to analog converter element from the continuous time sigma delta converter input;
- converting a digital signal below a threshold level to an analog signal using less than all of the elements of the digital to analog converter;
- and
- generating a combined signal by merging the analog signal with an input signal, wherein the combined signal is received by an integrator circuit of the continuous time sigma delta converter, wherein the output of the integrator circuit is coupled to an input of the multibit analog to digital converter circuit.
Dependencies are inferred from the claim text.