Front-end sampling for analog-to-digital conversion
First Claim
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1. An analog-to-digital converter comprising:
- an input to receive an input signal;
a quantizer, coupled to the input, to sample the input signal, and a residue generator, coupled to the quantizer and adapted to separately sample the input signal;
wherein sampling characteristics of the residue generator substantially match sampling characteristics of the quantizer.
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Abstract
An analog-to-digital converter including a quantizer and a residue generator, both of which sample an input voltage in parallel. The sampling characteristics of each of the residue generator and the quantizer are designed to substantially match one another. This converter may be used as a low-power ADC front-end circuit that does not require a dedicated sampleand-hold circuit. The front-end circuit consists of two substantially-matched sampling networks, one for the residue generator and the other for the quantizer, inside the first stage of the converter.
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Citations
12 Claims
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1. An analog-to-digital converter comprising:
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an input to receive an input signal;
a quantizer, coupled to the input, to sample the input signal, and a residue generator, coupled to the quantizer and adapted to separately sample the input signal;
wherein sampling characteristics of the residue generator substantially match sampling characteristics of the quantizer. - View Dependent Claims (2)
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3. A method of sampling an input voltage comprising:
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using a quantizer, sampling the input voltage; and
using a residue generator operatively connected to receive an output from the quantizer, having sampling characteristics substantially matching sampling characteristics of the quantizer, also sampling the input voltage. - View Dependent Claims (4)
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5. An analog-to-digital converter, comprising:
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a residue generator;
a quantizer;
each of the residue generator and the quantizer having a sampling network connected to sample a same analog input signal and the sampling networks having substantially matched sampling characteristics;
an output from the quantizer operatively connected to provide an input to the residue generator; and
the residue generator being configured and arranged to generate a residue signal from the quantizer output and samples from the residue generator sampling network. - View Dependent Claims (6, 7, 8, 9)
the quantizer sampling network comprising a sample-and-hold circuit for each of said comparators.
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9. A pipelined analog-to-digital converter comprising a first stage, one or more intermediate stages each of which receives as input a residue signal output from an immediately preceding stage, a final stage which converts a residue output signal from a next-to-final stage into a corresponding digital signal and correction logic which receives each stage'"'"'s output and generates a corresponding digital word;
- and at least the first stage being an analog-to-digital converter according to claim 5 or claim 6.
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10. In an analog-to-digital converter having a residue generator, the improvement comprising:
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a quantizer;
each of the residue generator and the quantizer having a sampling network connected to sample a same analog input signal and the sampling networks having substantially matched sampling characteristics;
an output from the quantizer operatively connected to provide an input to the residue generator; and
the residue generator being configured and arranged to generate a residue signal from the quantizer output and samples from the residue generator sampling network. - View Dependent Claims (11, 12)
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Specification