公开(公告)号：US11849643B2

公开(公告)日：2023-12-19

申请号：US17216767

申请日：2021-03-30

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John P. Lesso ,  Robert A. Steven

IPC: H01L41/04 ,  H10N30/40 ,  H10N30/20 ,  H10N30/80

CPC classification number: H10N30/40 ,  H10N30/20 ,  H10N30/802

Abstract: Circuitry for estimating a displacement of a piezoelectric transducer in response to a drive signal applied to the piezoelectric transducer, the circuitry comprising: monitoring circuitry configured to be coupled to the piezoelectric transducer and to output a sense signal indicative of an electrical signal associated with the piezoelectric transducer as a result of the drive signal; wherein the circuitry is configured to generate a difference signal based on the drive signal and the sense signal; and wherein the circuitry further comprises processing circuitry configured to apply at least one transfer function to the difference signal to generate a signal indicative of the displacement of the piezoelectric transducer.