公开(公告)号：US10117020B2

公开(公告)日：2018-10-30

申请号：US15131886

申请日：2016-04-18

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jaimin Mehta ,  James Thomas Deas ,  Stephen T. Hodapp ,  Brian Parker Chesney

IPC: H03G11/00 ,  H04R3/00 ,  H04R29/00 ,  H04R19/00

Abstract: A system may include control circuitry for detecting a plosive event associated with a microphone transducer and in response to the plosive event, causing restoration of acoustic sense operation of the microphone transducer and a processing circuit associated with the microphone transducer. A system for configuring a filter having at least two frequency response configurations to achieve an effective frequency response configuration intermediate to the at least two frequency response configurations may include control circuitry for rapidly switching between the at least two frequency response configurations such that a weighted average frequency response of the filter corresponds to the effective frequency response configuration.

公开(公告)号：US20180270588A1

公开(公告)日：2018-09-20

申请号：US15916597

申请日：2018-03-09

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Hynek Saman ,  James Thomas Deas

IPC: H04R19/04 ,  H04R19/00 ,  H03F3/187 ,  H03F3/45

CPC classification number: H04R19/04 ,  H03F1/26 ,  H03F3/187 ,  H03F3/45475 ,  H03F3/45636 ,  H03F3/505 ,  H03F2200/03 ,  H03F2200/213 ,  H04R19/005 ,  H04R2201/003

Abstract: This applications relates to methods and apparatus for amplifying signals from capacitive transducers, in particular MEMS transducers such as MEMS capacitive microphones. An amplifier circuit has a transducer biasing node (102) for outputting a transducer bias voltage for biasing the capacitive transducer (101) and a signal node (103) for receiving the input signal (Vin). An amplifier arrangement (108) comprising a feedback resistor network (304, 305) provides an amplified output signal (Vout). A voltage buffer (306) provides a buffered bias voltage at a buffer node (307) which is connected to a terminal of the feedback resistor network, to at least partly define the quiescent level of the output signal. The buffer node (307) is electrically coupled to the transducer biasing node (102) via a capacitance (106) which may form part of a bias filter.