Magnetometer
AssigneeRobert Bosch GmbH
InventorGuido De Sandre
Life of this patent
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Abstract
A magnetometer includes a measurement value transducer that supplies a signal to a first amplifier device; a summation element that reduces an output signal range of an output signal of the first amplifier device; a second amplifier device that amplifies an output signal of the summation element; a low-pass filter filtering an output signal of the second amplifier device; an analog-digital converter converting output of the filter into digital form; and a correction element that divides the digital signal by a correction factor that corresponds to the defined gain factor of the second amplifier device and adds a digital correction signal to the quotient to form a resulting signal, where a scope of the correction signal corresponds to the defined attenuation of the output signal of the first amplifier device.
Claims9
A magnetometer, comprising:
- a measurement value transducer;
- a first amplifier;
- a summator;
- a second amplifier;
- an analog-digital converter;
- and
- a corrector;
- wherein:
- the measurement value transducer is configured to supply a signal to the first amplifier to output a first amplified output signal;
- the summator is configured to reduce an output signal range of the first amplified output signal of the first amplifier in a predefined manner to output a summation output signal;
- the second amplifier is configured to amplify the summation output signal of the summator in a predefined manner to output a second amplified output signal;
- a low-pass filter is configured to output, based on the second amplified output signal, a filtered output signal;
- the analog-digital converter is configured to output a digital signal based on the filtered output signal;
- the corrector is configured to divide the digital signal by a correction factor that corresponds to a predefined gain factor of the second amplifier to obtain a quotient, and add a digital correction signal to the quotient to obtain a resulting magnetometer signal;
- and
- a scope of the correction signal corresponds to a predefined attenuation of the first amplified output signal.
A method for a magnetometer, the method comprising:
- supplying an output signal of a measurement value transducer to a first amplifier;
- reducing a range of a first amplified output signal output by the first amplifier;
- a second amplifier amplifying the reduced range of the first amplified output signal to produce an amplified attenuated residual signal;
- a low-pass filter removing high-frequency portions of the amplified attenuated residual signal to produce a filtered signal;
- an analog-digital converter converting the filtered signal to a digital signal;
- a corrector dividing the digital signal by a correction factor that corresponds to a predefined gain factor of the second amplifier to obtain a quotient, and adding a digital correction signal to the quotient to obtain a resulting magnetometer signal, wherein a scope of the correction signal corresponds to a predefined attenuation of the first amplified output signal.
Dependencies are inferred from the claim text.