Method of forming a transducer controller and circuit therefor
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United States of America Patent
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Jan 15, 2019
Grant Date -
Jan 25, 2018
app pub date -
Oct 4, 2016
filing date -
Oct 21, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
In one embodiment, a transducer controller is configured to form a drive signal with a first frequency to drive a transducer. The drive signal has a period and a half-period and drives the transducer for a first portion of the half-period. The transducer controller is configured to, for a second portion of the half-period, sense a voltage formed by the transducer, measure portions of the voltage and estimate a phase error between the first frequency and a resonant frequency of the transducer, and to adjust the first frequency to a second frequency that reduces the phase error.
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