Method and system for calibrating electronic devices using polynomial fit calibration scheme
First Claim
1. A method for calibrating the magnitude of a parameter used to adjust an output characteristic of an electronic device in accordance with the magnitude of an input signal, said method comprising the steps of:
- generating a plurality of test data points each comprising a particular input signal magnitude and a corresponding particular parameter calibration value, the output characteristic of said device when said parameter is set to said particular calibration value being the appropriate characteristic for an input signal of said particular magnitude;
determining the value for coefficients of an equation of predetermined form such that said equation with said coefficients defines a curve that substantially follows a plot of said plurality of test data points; and
storing said coefficients in said electronic device, wherein a calibrated parameter value is provided when said electronic device evaluates said equation with said stored coefficients using the detected magnitude of said input signal.
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Abstract
A system and method calibrates the magnitude of a parameter used to adjust an output characteristic of an electronic device in accordance with the magnitude of an input signal. The system generates a plurality of test data points. Each data point includes a test input signal magnitude and the corresponding parameter value which, when applied by the device, produces the correct output level for an input having the test magnitude. The data points are generated by a calibration control system which sets the test signal magnitude and then adjusts the parameter value until the correct output level is detected. The test data points are analyzed to determine the value for coefficients of an equation of predetermined form that defines a curve that substantially follows a plot of said plurality of test data points. The coefficients are stored in the electronic device. When the electronic device evaluates the equation using the stored coefficients and the detected magnitude of an actual input signal, the result is the appropriate parameter value for producing a calibrated output.
54 Citations
9 Claims
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1. A method for calibrating the magnitude of a parameter used to adjust an output characteristic of an electronic device in accordance with the magnitude of an input signal, said method comprising the steps of:
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generating a plurality of test data points each comprising a particular input signal magnitude and a corresponding particular parameter calibration value, the output characteristic of said device when said parameter is set to said particular calibration value being the appropriate characteristic for an input signal of said particular magnitude;
determining the value for coefficients of an equation of predetermined form such that said equation with said coefficients defines a curve that substantially follows a plot of said plurality of test data points; and
storing said coefficients in said electronic device, wherein a calibrated parameter value is provided when said electronic device evaluates said equation with said stored coefficients using the detected magnitude of said input signal. - View Dependent Claims (2, 3, 4, 5)
(a) applying a test input signal having a predetermined magnitude to said device;
(b) measuring said output characteristic as generated by said device in response to said test signal;
(c) adjusting the value of said parameter controlling said output characteristic until the measured output characteristic complies with a predetermined output characteristic;
(d) storing the predetermined magnitude of said applied test input signal and said parameter value as a test data point; and
(e) repeating steps (a)-(d) with an applied test input signal having a different predetermined magnitude.
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3. The method of claim 1, wherein said step of determining comprises the steps of:
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passing said plurality of test data points to a curve solving system; and
receiving said coefficients in response from said curve solving system.
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4. The method of claim 3, wherein said curve solving system provides an error measure indicating how closely said equation with said coefficients follows a plot of said plurality of test data points.
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5. The method of claim 4, further comprising the steps of:
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comparing said error measure with a predetermined error limit; and
indicating a potential defect in said electronic device when said error measure exceeds said predetermined limit.
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6. A method of calibrating the power output for a mobile cellular unit to the strength of a signal received from a base station, the power output of said unit being determined by the value of a signal applied to an output amplifier, said method comprising the steps of:
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generating a plurality of test data points each comprising a particular received signal strength value and a corresponding signal parameter value, the correct output power for said particular received signal strength value being provided by said unit when a signal having said corresponding signal parameter value is applied to said output amplifier;
determining the value for coefficients of an equation of predetermined form such that said equation with said coefficients defines a curve that substantially follows a plot of said plurality of test data points; and
storing said coefficients in said electronic device, wherein a calibrated signal parameter value is provided when said unit evaluates said equation with said stored coefficients using a detected received signal strength value. - View Dependent Claims (7)
(a) applying a test base station signal having a predetermined power level to said unit;
(b) measuring the output power as generated by said device in response to said test base station signal;
(c) adjusting the value of said signal parameter until the measured output power substantially equals a predetermined output power level appropriate for a unit receiving a base station signal having a power level equal to said predetermined power level;
(d) storing the predetermined power level and said signal parameter value as a test data point; and
(e) repeating steps (a)-(d) using a different predetermined power level.
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8. A system for calibrating the magnitude of a parameter used to adjust an output characteristic of an electronic device in accordance with the magnitude of an input signal, comprising:
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a signal generator for producing a test input signal of predetermined magnitude;
a signal detector for detecting the magnitude of said output characteristic;
a calibration control system providing said predetermined magnitude for test input signal to said signal generator and receiving said detected magnitude of said output characteristic from said signal detector and comprising;
at least one control input for adjusting the magnitude of said parameter in said device until the detected magnitude of said output characteristic substantially equals a calibration magnitude appropriate for the predetermined magnitude of said test input signal; and
a memory for storing a plurality of test data points each comprising the predetermined magnitude of said test input signal and the magnitude of said parameter in said device when the detected magnitude of said output characteristic substantially equals said calibration magnitude;
a curve solving system for receiving said plurality of test data points and providing coefficients of an equation of predetermined form, said equation with said coefficients defining a curve that substantially follows a plot of said plurality of test data points;
said calibration control system further comprising a data connection for writing said coefficients into a memory in said electronic device.
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9. A system for calibrating the magnitude of a parameter used to adjust an output characteristic of an electronic device in accordance with the magnitude of an input signal, said system comprising:
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means for generating a plurality of test data points each comprising a particular input signal magnitude and a corresponding particular parameter calibration value, the output characteristic of said device when said parameter is set to said particular calibration value being the appropriate characteristic for an input signal of said particular magnitude;
means for determining the value for coefficients of an equation of predetermined form such that said equation with said coefficients defines a curve that substantially follows a plot of said plurality of test data points; and
means for storing said coefficients in said electronic device, wherein a calibrated parameter value is provided when said electronic device evaluates said equation with said stored coefficients using the detected magnitude of said input signal.
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Specification