Signal processing circuit for reducing ripple in an output signal of a spinning current hall sensor and signal processing method
AssigneeInfineon Technologies AG
InventorsYongjia Li, Umberto Aracri, Mario Motz
Life of this patent
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Abstract
Signal processing circuit for a Hall sensor and signal processing method. Signal processing circuits for four-phase spinning Hall magnetic field sensors, corresponding methods and corresponding magnetic field sensor apparatuses are provided. In this case, a correction signal (c) is generated on the basis of a first feedback signal (fb1) and a second feedback signal (fb2), wherein the first feedback signal (fb1) is provided with a shorter signal propagation time than the second feedback signal (fb2).
Claims20
A signal processing circuit, comprising:
- a combiner configured to receive a first output signal from a four-phase spinning current Hall sensor and a correction signal, and combine the first output signal and the correction signal to form a corrected signal;
- a main signal path configured to receive the corrected signal and output a second output signal;
- a second signal path that branches off from a node within the main signal path and is configured to provide a first feedback signal, wherein the second signal path has a shorter signal propagation time than the main signal path;
- and
- a processing device configured to receive the first feedback signal and the second output signal as a second feedback signal, and generate the correction signal for reducing ripple in the first output signal based on the first feedback signal and the second output signal used by the processing device as the second feedback signal.
A magnetic field sensor apparatus, comprising:
- a signal processing circuit;
- and
- a four-phase spinning current Hall sensor,
- wherein the signal processing circuit comprises:
- a combiner configured to receive a first output signal from the four-phase spinning current Hall sensor and a correction signal, and combine the first output signal and the correction signal to form a corrected signal;
- a main signal path configured to receive the corrected signal and output a second output signal;
- a second signal path that branches off from a node within the main signal path and is configured to provide a first feedback signal, wherein the second signal path has a shorter signal propagation time than the main signal path;
- and
- a processing device configured to receive the first feedback signal and the second output signal as a second feedback signal, and generate the correction signal for reducing ripple in the first output signal based on the first feedback signal and the second output signal used by the processing device as the second feedback signal.
A signal processing method, comprising:
- combining a first output signal from a four-phase spinning current Hall sensor and a correction signal to form a corrected signal, wherein the first output signal is a four-phase spinning current Hall signal;
- providing the corrected signal to a main signal path;
- outputting a second output signal from an output of the main signal path;
- providing the second output signal as a second feedback signal from the output of the main signal path;
- providing a first feedback signal which is diverted from a node within the main signal path, wherein the first feedback signal is provided with a shorter signal propagation time than the second feedback signal;
- and
- generating the correction signal for reducing ripple in the first output signal based on the first feedback signal and the second feedback signal.
Dependencies are inferred from the claim text.