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公开(公告)号：US20170357839A1
公开(公告)日：2017-12-14
申请号：US15688639
申请日：2017-08-28
Applicant: Apple Inc.
Inventor： Mohammad Yeke Yazdandoost , Glovanni Gozzini , Jean-Marie Bussat
IPC: G06K9/00
CPC classification number: G06K9/0002
Abstract: An acoustic fingerprint imaging system having a plurality of acoustic elements, each acoustic element including a transducer, and independent drive and sense circuitry is disclosed. Drive circuitry may require higher voltage than low voltage sense circuitry. Many embodiments described herein include a ground shifting controller to apply a voltage bias to the low voltage sense circuitry during a drive operation, in order to prevent electrical damage to the sense circuitry.
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