CHOPPED CIRCUIT WITH AC AND DC RIPPLE ERROR FEEDBACK LOOPS
First Claim
1. A system, comprising:
- a main signal path configured to receive an input signal, comprising;
a first chopping correction circuit configured to chop the input signal at a first frequency to reduce an offset error in the input signal; and
a second chopping correction circuit configured to chop the input signal at a second frequency to further reduce the offset error;
a first feedback loop configured to generate a first compensation signal, which is fed back to the main signal path to mitigate a first chopper ripple error generated by the first chopping correction circuit; and
a second feedback loop configured to generate a second compensation signal, which is fed back to the main signal path to mitigate a second chopper ripple error generated by the second chopping correction circuit.
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Accused Products
Abstract
The present disclosure relate to a sensor system having a low offset error. In some embodiments, the sensor system comprises a sensor configured to generate a sensor signal, which is provided to a main signal path having a first chopping correction circuit and a second chopping correction circuit. The first and second chopping correction circuit chop the sensor signal at first and second frequencies to reduce offset errors, but in doing so generate first and second chopping ripple errors. A first digital offset feedback loop generates a first compensation signal, which is fed back into the main signal path to mitigate the first chopping ripple error. A second digital offset feedback loop generates a second compensation signal, which is fed back into the main signal path to mitigate the second chopping ripple error.
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Citations
20 Claims
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1. A system, comprising:
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a main signal path configured to receive an input signal, comprising; a first chopping correction circuit configured to chop the input signal at a first frequency to reduce an offset error in the input signal; and a second chopping correction circuit configured to chop the input signal at a second frequency to further reduce the offset error; a first feedback loop configured to generate a first compensation signal, which is fed back to the main signal path to mitigate a first chopper ripple error generated by the first chopping correction circuit; and a second feedback loop configured to generate a second compensation signal, which is fed back to the main signal path to mitigate a second chopper ripple error generated by the second chopping correction circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sensor system, comprising:
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a sensor configured to provide a sensor signal corresponding to a physical quantity measured by the sensor to a main signal path; a signal modification circuit configured to receive the sensor signal, to modify the sensor signal, and to generate an output signal; a first chopping correction circuit configured to chop the sensor signal at a first frequency to reduce an offset error of the sensor signal; a first feedback loop configured to generate a first compensation signal based on a first feedback signal received from the main signal path, which mitigates a first chopper ripple error generated by the first chopping correction circuit; a second chopping correction circuit configured to chop the sensor signal at a second frequency to reduce the offset error; and a second feedback loop configured to generate a second compensation signal based on a second feedback signal received from the main signal path, which mitigates a second chopper ripple error generated by the second chopping correction circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of reducing offset errors in a signal, comprising:
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providing an input signal to a main signal path comprising a first chopping correction circuit and a second chopping correction circuit configured to reduce an offset within the input signal; providing a first feedback signal from the main signal path to a first feedback loop and a second feedback signal from the main signal path to a second feedback loop; generating a first compensation signal based upon the first feedback signal that mitigates a first chopper ripple error generated by the first chopping correction circuit; and generating a second compensation signal based upon the second feedback signal that mitigates a second chopper ripple error generated by the second chopping correction circuit. - View Dependent Claims (19, 20)
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Specification