High bandwidth hall sensor
AssigneeTexas Instruments Incorporated
InventorsArup Polley, Srinath Ramaswamy, Baher S. Haroun, Rajarshi Mukhopadhyay
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Abstract
A high bandwidth Hall sensor includes a high bandwidth path and a low bandwidth path. The relatively high offset (from sensor offset) of the high bandwidth path is estimated using a relatively low offset generated by the low bandwidth path. The relatively high offset of the high bandwidth path is substantially reduced by combining the output of the high bandwidth path with the output of the low bandwidth path to generate a high bandwidth, low offset output. The offset can be further reduced by including transimpedance amplifiers in the high bandwidth sensors to optimize the frequency response of high bandwidth Hall sensor.
Claims20
A circuit, comprising:
- a first amplifier for generating a first amplified signal in response to a first Hall sensor signal received from a first Hall-effect sensor;
- a second amplifier for generating a second amplified signal in response to a second Hall sensor signal received from a second Hall-effect sensor;
- a third amplifier for generating a subtracted output signal in response to a difference between the first amplified signal and the second amplified signal;
- a filter for generating an offset correction signal in response to the subtracted output signal;
- and
- a fourth amplifier for generating a corrected Hall signal in response to the offset correction signal and in response to the second amplified signal.
A circuit, comprising:
- a first amplifier for generating a high-frequency portion output signal in response to a difference between a first Hall output signal and a second Hall output signal, wherein the second Hall output signal includes higher frequencies than the frequencies included by the first Hall output signal;
- a filter for reducing high-frequency content of the high-frequency portion output signal and generating an offset correction signal;
- and
- a second amplifier for generating a corrected Hall signal in response to a difference between the second Hall output signal and the offset correction signal.
A system, comprising:
- a first Hall-effect sensor for generating a first Hall sensor signal in response to an applied magnetic field;
- a second Hall-effect sensor for generating a second Hall sensor signal in response to the applied magnetic field;
- a first amplifier for generating a first amplified signal in response to the first Hall sensor signal;
- a second amplifier for generating a second amplified signal in response to the second Hall sensor signal;
- a third amplifier for generating a subtracted output signal in response to the first amplified signal and the second amplified signal;
- a filter for generating an offset correction signal in response to the subtracted output signal;
- and
- a fourth amplifier for generating a corrected Hall signal in response to the offset correction signal and in response to the second amplified signal.
A method, comprising:
- generating a first amplified signal in response to a first Hall sensor signal received from a first Hall-effect sensor;
- generating a second amplified signal in response to a second Hall sensor signal received from a second Hall-effect sensor;
- generating a subtracted output signal in response to the first amplified signal and the second amplified signal, wherein the subtracted output signal includes high frequency information generated in response to a magnetic field applied to the second Hall-effect sensor;
- generating an offset correction signal in response to the subtracted output signal;
- and
- generating a corrected Hall signal in response to the offset correction signal and in response to the second amplified signal.
Dependencies are inferred from the claim text.