Analog to digital conversion using differential dither
AssigneeRaytheon Company
InventorsIan S. Robinson, James Toplicar, John G. Heston
Life of this patent
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Abstract
An analog-to-digital conversion system includes two quantizers having a least significant bit arranged in a parallel pair. An input circuit coupled to the quantizers provides an analog input signal to the quantizers. A dither generator coupled to the quantizers provides an analog differential dither signal for perturbing quantization of the analog input signal. A combiner coupled to the quantizers adds respective outputs of the quantizers to obtain a linearized digital representation of the analog input signal.
Claims18
An analog-to-digital conversion system, comprising:
- a first quantizer and a second quantizer arranged in a parallel pair, the quantizers having a least significant bit (LSB) size;
- an input circuit coupled to the quantizers and operational to provide an analog input signal to the quantizers;
- a dither generator coupled to the quantizers and operational to provide an analog differential dither signal for perturbing quantization of the analog input signal;
- and
- a combiner coupled to the quantizers and operational to add respective outputs of the quantizers to obtain a linearized digital representation of the analog input signal.
A method of analog-to-digital conversion comprising:
- configuring an input circuit to receive an analog input signal;
- coupling the input circuit to a first quantizer and a second quantizer, the quantizers being arranged in parallel and having a least significant bit (LSB) size;
- coupling a dither generator and a combiner to the quantizers;
- transmitting the analog input signal to the quantizers;
- operating the dither generator to provide an analog differential dither signal to the quantizers for perturbing quantization of the analog input signal;
- and
- operating the combiner to add respective outputs of the quantizers to obtain a linearized digital representation of the analog input signal.
Dependencies are inferred from the claim text.