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US 10,473,691 B2Granted
Offset cancellation device for micro-electromechanical system
AssigneeSTMicroelectronics S.r.l.
InventorFabio Romano
Life of this patent
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Abstract
The present disclosure is directed to a system that includes a sensor and a signal conditioner coupled to the sensor. The signal conditioner includes signal processing circuitry coupled to the sensor and offset cancellation circuitry. The offset cancellation circuitry includes a sign detector configured to output a high signal or a low signal based on a sign of an output signal from the signal processing circuitry, an integrator coupled to the sign detector, and a divider coupled to the integrator and to an input of the signal processing circuitry.
Claims8
A system, comprising:
- a micro-electromechanical system;
- and
- an offset cancellation device coupled to the micro-electromechanical system, the offset cancellation device including:
- a signal detector configured to receive a first analog signal from the micro-electromechanical system and to output a first digital signal;
- and
- a feedback loop coupled to the signal detector, the feedback loop being configured to provide a second analog signal to the signal detector based on the first digital signal, the signal detector being configured to combine the first and second analog signals, the feedback loop being configured to:
- calculate a first average of the first digital signal over a first interval and multiply the first average by a first scalar in a first mode;
- and
- calculate a second average of the first digital signal over a second interval and multiply the second average by a second scalar in a second mode, the first interval being smaller than the second interval, and the first scalar being greater than the second scalar.
6 more elements
Dependencies are inferred from the claim text.