Adaptively calibrating analog-to-digital conversion
First Claim
1. An arrangement for calibrating an analog-to-digital conversion, said arrangement comprising:
- an analog-to-digital converter adapted for receiving an analog signal and producing a digital signal;
a recursive estimator configured for computing at least one parameter related to said analog signal from said digital signal; and
an adaptive filter configured for receiving said at least one parameter and said digital signal and producing therefrom a digital representation of said analog signal, said adaptive filter adapting to a change of said at least one parameter.
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Abstract
A method, arrangement, and system enable adaptive calibration of an analog-to-digital converter (ADC) from reference signals with unknown parameter(s) that may vary (e.g., a varying frequency). An analog reference signal s(t) is supplied to an ADC to be calibrated. The output x(n) of the ADC is used by a, e.g., sine-wave reconstruction filter to reconstruct an estimate ŝ(n) of the sampled instances of the signal s(t). A recursive frequency estimator within the sine-wave reconstruction filter produces a frequency estimate of the analog reference signal s(t) from the signal x(n). An adaptive reconstruction filter uses this frequency estimate and the signal x(n) to produce the estimate ŝ(n). When a convergence detector determines that the adaptive reconstruction filter has converged, the estimate ŝ(n) is used to alter values that are stored in a correction table. During functional operation of the ADC, the correction table is used to correct the output values of the ADC.
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Citations
47 Claims
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1. An arrangement for calibrating an analog-to-digital conversion, said arrangement comprising:
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an analog-to-digital converter adapted for receiving an analog signal and producing a digital signal;
a recursive estimator configured for computing at least one parameter related to said analog signal from said digital signal; and
an adaptive filter configured for receiving said at least one parameter and said digital signal and producing therefrom a digital representation of said analog signal, said adaptive filter adapting to a change of said at least one parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for calibrating an analog-to-digital conversion, said method comprising the steps of:
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converting an analog reference signal to a digital signal;
recursively estimating at least one parameter related to said analog reference signal from said digital signal; and
adaptively reconstructing a digital representation of said analog reference signal from said digital signal and said at least one parameter, said step of adaptively reconstructing comprising the step of adapting to a change of said at least one parameter. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An arrangement for calibrating an analog-to-digital conversion, said arrangement comprising:
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an analog-to-digital converter adapted for receiving an analog calibration signal and producing a digital signal;
a recursive estimator configured for computing a first parameter related to said analog calibration signal from said digital signal;
an adaptive filter configured for receiving said first parameter and said digital signal and producing therefrom a digital representation of said analog calibration signal, said adaptive filter adapting to a change in said first parameter; and
a correction table for storing at least one value therein, said at least one value based, at least in part, on said digital representation of said analog calibration signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A method for calibrating an analog-to-digital conversion, said method comprising the steps of:
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converting an analog calibration signal to a digital signal;
recursively estimating a first parameter related to said analog calibration signal from said digital signal;
adaptively reconstructing a digital representation of said analog calibration signal from said digital signal and said first parameter, said step of adaptively reconstructing adapting to a change in said first parameter; and
storing at least one value in a correction table, said at least one value based, at least in part, on said digital representation, if said step of adaptively reconstructing has converged. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. An arrangement for calibrating analog-to-digital conversion, said arrangement comprising:
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an analog-to-digital converter, said analog-to-digital converter adapted to receive an analog input and to produce a digital output, said analog input corresponding to at least one parameter;
a recursive estimator, said recursive estimator configured to receive said digital output and to estimate a first version of said at least one parameter therefrom; and
an adaptive filter, said adaptive filter associated with a second version of said at least one parameter, said adaptive filter configured to receive said digital output and said first version of said at least one parameter, said adaptive filter further configured to determine at least one value based on, at least in part, said digital output and at least one of said first version of said at least one parameter and said second version of said at least one parameter. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification