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US 5,396,241 AGranted
Method and apparatus for digitally controlled linearization of an analog signal
AssigneeKaman Instrumentation Corporation
InventorsGregory H. Ames, Austin L. Widener
Life of this patent
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Abstract
A method and apparatus for linearizing an analog signal. The signal is converted into a digital form and digital gain and offset words are fetched based upon the value of the measurement signal and any other parameters which affect linearity, such as temperature for example. The digital gain and offset words are converted to analog values and inserted into an analog signal path of the measurement signal.
Claims13
A linearizing device comprising:
- an analog signal path;
- a digital processor, an output of said digital processor being coupled to said analog signal path;
- an analog to digital convertor having an output which is coupled to said digital processor;
- a measurement signal generating device coupled to said analog to digital convertor and said analog signal path;
- and
- a memory device associated with said digital processor, said memory device containing predetermined data which corresponds to a linearizing correction of an analog measurement signal which is generated by said measurement signal generating device, said linearizing correction being inserted into said analog signal path by said digital processor based upon the value of said measurement signal.
3 more elements
A linearizing device comprising:
- an analog signal path;
- a digital processor;
- an analog to digital convertor having an output which is coupled to said digital processor, an output of said digital processor being coupled to said analog signal path;
- a measurement signal generating device, which generates a measurement signal, coupled to said digital processor and said analog signal path;
- and
- means for determining a linearizing correction for an output of said measurement signal generating device, said means for determining being operatively connected to said digital processor, said linearizing correction being inserted into said analog signal path by said digital processor based upon the value of an output of said measurement signal generating device.
3 more elements
A method of linearizing an analog measurement signal, comprising the steps of:
- branching said measurement signal into an analog signal path and a control path;
- converting said measurement signal in said control path into a digital signal;
- retrieving digital gain and offset control words based upon a value of said digital signal;
- converting said gain and offset control words into analog gain and offset values respectively;
- combining said gain and offset values into said measurement signal in said analog signal path so as to linearize said measurement signal.
2 more elements
Dependencies are inferred from the claim text.