Analog to digital conversion method and apparatus
First Claim
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1. Apparatus for converting an analog input signal applied thereto to a digital output signal, said apparatus comprising:
- analog to digital conversion means, said conversion means being adapted to convert an analog signal applied thereto to a digital signal so long as the magnitude of said analog signal lies within an acceptable range for said analog to digital conversion means;
means for scaling the analog signal applied to said analog to digital conversion means, said scaling means being adapted when necessary to (1) perform at least one adjustment step with respect to said analog input signal applied to said apparatus and thereby generate an adjusted analog signal lying within said range, and to (2) apply said adjusted analog signal to said analog to digital conversion means;
means for calibrating said scaling means by determining the effect of the performance of said scaling means upon the digital signal produced by said analog to digital conversion means and for producing a digital signal in accordance therewith wherein said calibration means comprises;
means for determining the effect of the performance of a single adjustment step by said scaling means upon the digital signal produced by said analog to digital conversion means and for generating a digital signal in accordance therewith;
means for storing said digital signal generated by said determining means; and
,means for multiplying said stored digital value by a digital value indicative of the number of adjustment steps required by said scaling means; and
,means for performing at least one mathematical operation with respect to said digital signal produced by said calibrating means and said digital signal produced by said analog to digital conversion means, the result of said mathematical operation being the digital output signal of said apparatus.
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Abstract
An analog to digital conversion method and apparatus includes the use of a scaling circuit 15 to scale the magnitude of an analog signal D applied to ADC 4 to within an acceptable input range. A calibration circuit 16 generates a signal M indicative of the effect of the scaling circuit 15 upon a digital signal E produced by the ADC 4. An adder 14 adds the calibration signal M and the digital signal E of ADC 4 to yield a digital output signal N which is the digital representation of measured analog input signal A.
18 Citations
6 Claims
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1. Apparatus for converting an analog input signal applied thereto to a digital output signal, said apparatus comprising:
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analog to digital conversion means, said conversion means being adapted to convert an analog signal applied thereto to a digital signal so long as the magnitude of said analog signal lies within an acceptable range for said analog to digital conversion means; means for scaling the analog signal applied to said analog to digital conversion means, said scaling means being adapted when necessary to (1) perform at least one adjustment step with respect to said analog input signal applied to said apparatus and thereby generate an adjusted analog signal lying within said range, and to (2) apply said adjusted analog signal to said analog to digital conversion means; means for calibrating said scaling means by determining the effect of the performance of said scaling means upon the digital signal produced by said analog to digital conversion means and for producing a digital signal in accordance therewith wherein said calibration means comprises; means for determining the effect of the performance of a single adjustment step by said scaling means upon the digital signal produced by said analog to digital conversion means and for generating a digital signal in accordance therewith; means for storing said digital signal generated by said determining means; and
,means for multiplying said stored digital value by a digital value indicative of the number of adjustment steps required by said scaling means; and
,means for performing at least one mathematical operation with respect to said digital signal produced by said calibrating means and said digital signal produced by said analog to digital conversion means, the result of said mathematical operation being the digital output signal of said apparatus. - View Dependent Claims (2, 3)
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4. A method for converting an analog input signal to a digital output signal, said method comprising the steps of:
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using an analog to digital conversion means to convert an analog signal to a digital signal, said conversion means being adapted to convert an analog signal applied thereto to a digital signal so long as said analog signal lies within an acceptable input range for said analog to digital conversion means; scaling said analog signal applied to said analog to digital conversion means using scaling means, said scaling means being adapted when necessary to (1) perform at least one adjustment step with respect to said analog input signal applied to said apparatus and thereby generate an adjusted analog signal lying within said range, and (2) apply said adjusted analog signal to said analog to digital conversion means; calibrating said scaling means by determining the effect of the performance of said scaling means upon the digital signal produced by said analog to digital conversion means and for producing a digital signal in accordance therewith said calibrating step including the steps of; determining the effect of the performance of a single adjustment step by said scaling means upon the digital signal produced by said analog to digital conversion means and generating a digital signal in accordance therewith; storing said digital signal generated by said determining means; and
,multiplying said stored digital value by a digital value indicative of the relative number of adjustment steps required by said scaling means; and
,performing at least one mathematical operation with respect to said digital signal produced by said calibrating means and said digital signal produced by said analog to digital conversion means, the result of said mathematical operation being the digital output signal of said apparatus. - View Dependent Claims (5, 6)
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Specification