Noise-shaping converter with digital modulator
AssigneeSilicon Laboratories Inc.
InventorGang Yuan
Life of this patent
Estimating the term…
Abstract
In one aspect, an apparatus includes: a first feedback digital-to-analog converter (DAC) to receive a first feedback signal from a first successive approximation register (SAR) and output a first analog signal; a comparator to compare the first analog signal with a reference voltage; the first SAR to store a digital value based on the comparison and provide the first feedback signal to the first DAC; a second feedback DAC to receive a modulated quantized residual error based on the comparison and output a second analog signal; a second SAR to store a quantized residual error; and a delta-sigma modulator (DSM) to modulate the quantized residual error and provide the modulated quantized residual error to the second feedback DAC.
Claims20
An apparatus comprising:
- a first feedback digital-to-analog converter (DAC) to receive a first feedback signal from a first successive approximation register (SAR) and output a first analog signal;
- a comparator coupled to the first feedback DAC, the comparator to compare the first analog signal with a reference voltage;
- the first SAR coupled to the comparator, the first SAR to store a digital value based on the comparison and provide the first feedback signal to the first feedback DAC;
- a second feedback DAC to receive a modulated quantized residual error based on the comparison and output a second analog signal;
- a second SAR coupled to the comparator, the second SAR to store a quantized residual error;
- and
- a delta-sigma modulator (DSM) coupled to the second SAR, the DSM to modulate the quantized residual error and provide the modulated quantized residual error to the second feedback DAC.
A method comprising:
- converting, during a first cycle of a conversion operation, an input voltage to a digital value;
- converting, during the first cycle of the conversion operation, a residual error of converting the input voltage to the digital value to a quantized error;
- digitally modulating the quantized error to a digitally modulated quantized error;
- and
- removing, during a second cycle of the conversion operation, the residual error using the digitally modulated quantized error.
An apparatus comprising:
- at least one sensor to sense real world information and provide an analog signal based at least in part thereon;
- and
- an analog-to-digital converter (ADC) coupled to the at least one senor to convert the analog signal to a digital value, the ADC comprising:
- an analog domain to receive and convert the analog signal to the digital value;
- and
- a digital domain coupled to the analog domain, the digital domain to receive a quantization error associated with the conversion of the analog signal, modulate the quantization error, and provide the modulated quantization error to the analog domain.
Dependencies are inferred from the claim text.