Method of forming a transducer controller and circuit therefor
AssigneeSemiconductor Components Industries, LLC
InventorsJiri Kutej, Pavel Horsky
Life of this patent
Estimating the term…
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.
Claims20
A method of forming a transducer controller comprising:
- configuring a transducer controller to form a drive signal at a first frequency that forms a drive period and a drive half-period;
- configuring the transducer controller to drive a transducer with the drive signal for a first portion of a drive half-period;
- configuring the transducer controller to sense a reverberation voltage formed by the transducer for a second portion of the drive half-period;
- configuring the transducer controller to measure portions of the reverberation voltage and estimate a phase error between the first frequency and a resonant frequency of the transducer;
- and
- configuring the transducer controller to adjust the first frequency to a second frequency that reduces the phase error.
A method of forming a transducer controller comprising:
- configuring the transducer controller to form a drive signal at a first frequency that forms a drive period and a drive half-period;
- configuring the transducer controller to drive a transducer with the drive signal for a first portion of a drive half-period;
- configuring the transducer controller to sense in a second portion of the drive half-period a reverberation signal formed by the transducer in response to the drive signal;
- configuring the transducer controller to determine a phase error between the first frequency and a frequency of the reverberation signal;
- and
- configuring the transducer controller to adjust the first frequency to a second frequency that reduces the phase error.
A method of forming a transducer controller comprising:
- configuring the transducer controller to form a drive signal at a first frequency that forms a drive period and a drive half-period;
- configuring the transducer controller to drive a transducer with the drive signal for a at least first portion of the drive half-period;
- configuring the transducer controller to sense in a second portion of the drive half-period a reverberation signal formed by the transducer in response to the drive signal wherein the transducer controller is configured to ignore the reverberation signal responsively to transitions of the drive signal;
- configuring the transducer controller to determine a phase error between the first frequency and a frequency of the reverberation signal;
- and
- configuring the transducer controller to adjust the first frequency to a second frequency that is closer to a reverberation frequency of the transducer than the first frequency.
Dependencies are inferred from the claim text.