Analog-to-digital conversion system with second order noise shaping and a single amplifier
AssigneeTexas Instruments Incorporated
InventorsRahmi Hezar, Oguz Altun
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Abstract
A analog-to-digital converters and second order noise shaping systems are presented for providing a noise shaped analog feedback signal to a A/D converter in an analog-to-digital conversion system. The noise shaping system comprises a first order integrator having a single amplifier, and a digital error feedback system comprising a digital signal processing system, in which the digital error feedback system provides an analog feedback signal to the A/D converter with second order noise shaping with respect to a quantization error associated with the A/D converter.
Claims24
An analog-to-digital conversion system, comprising:
- a first A/D converter providing a first digital output according to a system analog input and according to a noise shaped first analog feedback signal;
- and
- a noise shaping system with respect to quantization noise associated with said converter of an order N having less than N integrator amplifiers, the noise shaping system being coupled to the first A/D converter and providing the first analog feedback signal according to the first digital output, the first analog feedback signal being noise shaped by the noise shaping system to an order N with respect to a quantization error associated with the first A/D converter, wherein N is an integer greater than 1.
A noise shaping system for providing a noise shaped first analog feedback signal to a first A/D converter in an analog-to-digital conversion system, the noise shaping system comprising:
- a first DAC coupled with the first A/D converter, the first DAC providing an analog first DAC output according to a first digital output;
- a delta sigma modulator coupled with the first DAC, the delta sigma modulator providing a second digital output according to a difference between the first DAC output and a system analog input;
- and
- a digital error feedback system coupled with the delta sigma modulator, the digital error feedback system providing the first analog feedback signal to the first A/D converter according to the second digital output.
A noise shaping system of an order N for providing a noise shaped analog feedback signal to a first A/D converter in an analog-to-digital conversion system, the noise shaping system comprising:
- a DAC receiving a first digital output from the first A/D converter, the DAC providing an analog DAC output according to the first digital output;
- a second A/D converter coupled with the DAC, the second A/D converter comprising less than N integrator amplifiers and providing a second digital output according to a difference between the DAC output and a system analog input, N being an integer greater than 1;
- and
- a digital error feedback system coupled with the second A/D converter, the digital error feedback system providing a noise shaped analog feedback signal to the first A/D converter according to the second digital output, wherein the first analog feedback signal is noise shaped by the digital error feedback system to order N with respect to a quantization error associated with the first A/D converter.
A second order noise shaping system for providing a noise shaped analog feedback signal to an A/D converter in an analog-to-digital conversion system, the noise shaping system comprising:
- a second order integrator having a single amplifier;
- and
- a digital error feedback system comprising a digital signal processing system, the digital error feedback system providing an analog feedback signal to the A/D converter with second order noise shaping with respect to a quantization error associated with the A/D converter.
Dependencies are inferred from the claim text.