US 12,445,782 B2
Piezoelectric mems device for producing a signal indicative of detection of an acoustic stimulus
Robert John Littrell, Belmont, MA (US); Ronald Gagnon, Boston, MA (US); and Karl Grosh, Boston, MA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Mar. 27, 2023, as Appl. No. 18/190,719.
Application 18/190,719 is a continuation of application No. 15/930,530, filed on May 13, 2020, granted, now 11,617,041.
Application 15/930,530 is a continuation of application No. 16/081,015, granted, now 10,715,922, issued on Jul. 14, 2020, previously published as PCT/US2017/019996, filed on Feb. 28, 2017.
Claims priority of provisional application 62/442,221, filed on Jan. 4, 2017.
Claims priority of provisional application 62/301,481, filed on Feb. 29, 2016.
Prior Publication US 2023/0308808 A1, Sep. 28, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 17/00 (2006.01); H04R 3/00 (2006.01); H04R 3/04 (2006.01); H04R 17/02 (2006.01)
CPC H04R 17/025 (2013.01) [H04R 3/00 (2013.01); H04R 3/04 (2013.01); H04R 17/02 (2013.01); H04R 2201/003 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A device comprising:
a piezoelectric micro electro-mechanical systems (MEMS) transducer having an output;
a controllable switch having a control input and configured to provide power to one of a first output or a second output;
a detection circuit banded over a frequency range and having a signal input coupled to the output of the piezoelectric MEMS transducer, wherein the detection circuit is further coupled to the first output of the controllable switch, wherein the detection circuit is configured to produce a first signal at an output of the detection circuit based on an acoustic level of the piezoelectric MEMS transducer exceeding a threshold level; and
a second circuit coupled to the second output of the controllable switch and the piezoelectric MEMS transducer,
wherein the controllable switch is configured to alternate between providing power to the detection circuit via the first output of the controllable switch and providing power to the second circuit via the second output of the controllable switch based on the first signal.