Method for correcting non-linearities of an output signal of an electrical component, particularly a measuring transducer
First Claim
1. A method for correcting non-linearities of an electrical output signal of an electrical component with the aid of a characteristics map that is defined by discrete interpolation points and stored in a characteristics-map memory, comprising:
- performing an A/D conversion of at least one analog signal influencing the non-linearities of the electrical output signal;
over-sampling the at least one analog signal;
shifting a quantization noise in the at least one analog signal out of a signal-frequency range toward higher frequencies, wherein the A/D conversion, over-sampling, and shifting is performed by a delta-sigma modulator;
addressing the characteristics-map memory storing the characteristics map using an output signal of the delta-sigma modulator;
ascertaining the interpolation points of the characteristics map that are adjacent as a function of the at least one analog signal which is used to address the characteristics map; and
performing an interpolation between the ascertained adjacent interpolation points using a noise in the at least one analog signal based on the quantization noise to ascertain an output signal of the characteristics map.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for correcting non-linearities of an output signal of an electrical component with the aid of a characteristics map that is defined by discrete interpolation points. In this context, the adjacent interpolation points of the characteristics map are ascertained as a function of at least one signal influencing the non-linearities of the output signal. Interpolation is carried out between these interpolation points, and a corresponding correction signal is ascertained as a function of the or each signal by an interpolation. The output signal of the electrical component is corrected as a function of the correction signal. To improve the correction of non-linear transfer characteristics and/or temperature responses of the electrical component, it is proposed that the or each signal for addressing the characteristics map be high-pass filtered, and the correction signal be ascertained as a function of the or each signal by the interpolation and a subsequent low-pass filtering.
-
Citations
15 Claims
-
1. A method for correcting non-linearities of an electrical output signal of an electrical component with the aid of a characteristics map that is defined by discrete interpolation points and stored in a characteristics-map memory, comprising:
-
performing an A/D conversion of at least one analog signal influencing the non-linearities of the electrical output signal;
over-sampling the at least one analog signal;
shifting a quantization noise in the at least one analog signal out of a signal-frequency range toward higher frequencies, wherein the A/D conversion, over-sampling, and shifting is performed by a delta-sigma modulator;
addressing the characteristics-map memory storing the characteristics map using an output signal of the delta-sigma modulator;
ascertaining the interpolation points of the characteristics map that are adjacent as a function of the at least one analog signal which is used to address the characteristics map; and
performing an interpolation between the ascertained adjacent interpolation points using a noise in the at least one analog signal based on the quantization noise to ascertain an output signal of the characteristics map. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A digital sensor evaluation circuit of an electrical component for correcting non-linearities of an electrical output signal of the electrical component, the evaluation circuit comprising:
-
a characteristics-map memory in which discrete interpolation points of a characteristics map are stored;
a delta-sigma modulator for A/D conversion of at least one signal affecting the non-linearities of the output signal of the electrical component, for oversampling the at least one signal, and for shifting a quantization noise in the at least one signal out of a signal-frequency range toward higher frequencies;
an arrangement for addressing the characteristics-map memory using an output of the delta-sigma modulator, and for addressing the characteristics map using the at least one signal;
an arrangement for ascertaining the interpolation points of the characteristics map that are adjacent as a function of at least one signal;
an arrangement for ascertaining an output signal of the characteristics map as a function of the at least one signal by an interpolation between interpolation points of the characteristic map using a noise of the at least one signal based on the quantization noise; and
an arrangement for correcting the output signal of the electrical component as a function of the output signal of the characteristics map. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A measuring transducer for converting one of physical quantities and chemical quantities, detected by a sensor, into an electrical output signal, comprising:
a digital sensor evaluation circuit for correcting non-linearities of an the electrical output signal, the evaluation circuit including;
a characteristics-map memory in which discrete interpolation points of a characteristics map are stored, a delta-sigma modulator for A/D conversion of at least one signal affecting the non-linearities of the electrical output signal, for oversampling the at least one signal, and for shifting a quantization noise in the at least one signal out of a signal-frequency range toward higher frequencies, an arrangement for addressing the characteristics-map memory using an output of the delta-sigma modulator, and for addressing the characteristics map using the at the least one signal, an arrangement for ascertaining the interpolation points of the characteristics map that are adjacent as a function of at least one signal, an arrangement for ascertaining a corresponding correction signal as a function of the at least one signal by an interpolation between interpolation points of the characteristic map using a noise of the at least one signal based on the quantization noise, and an arrangement for correcting the output signal of the electrical component as a function of the output signal of the characteristics map.
-
14. A storage medium for storing a computer program that when executed on a computing element achieves a performance of:
-
performing an A/D conversion of at least one analog signal influencing the non-linearities of the electrical output signal;
over-sampling the at least one analog signal;
shifting a quantization noise in the at least one analog signal out of a signal-frequency range toward higher frequencies, wherein the A/D conversion, over-sampling, and shifting is performed by a delta-sigma modulator;
addressing the characteristics-map memory storing the characteristics man using an output signal of the delta-sigma modulator;
ascertaining the interpolation points of the characteristics map that are adjacent as a function of the at least one analog signal which is used to address the characteristics map; and
performing an interpolation between the ascertained adjacent interpolation points using a noise in the at least one analog signal based on the quantization noise to ascertain an output signal of the characteristics map; and
correcting the output signal of the electrical component as a function of the output signal of the characteristics map. - View Dependent Claims (15)
-
Specification