公开(公告)号：US11606642B2

公开(公告)日：2023-03-14

申请号：US17343479

申请日：2021-06-09

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Anthony S. Doy ,  Eric J. King

IPC: H04R3/00 ,  H03K17/687 ,  H03F3/217

Abstract: The application describes a switched driver (401) for outputting a drive signal at an output node (402) to drive a load such as a transducer. The driver receives respective high-side and low-side voltages (VinH, VinL) defining an input voltage at first and second input nodes and has connections for first and second capacitors (403H, 403L). A network of switching paths is configured such that each of the first and second capacitors can be selectively charged to the input voltage, the first input node can be selectively coupled to a first node (N1) by a path that include or bypass the first capacitor, and the second input node can be selectively coupled to a second node (N2) by a path that includes or bypasses the second capacitor. The output node (402) can be switched between two switching voltages at the first or second nodes. The driver is selectively operable in different operating modes, where the switching voltages are different in each of said modes.

公开(公告)号：US11204670B2

公开(公告)日：2021-12-21

申请号：US17142484

申请日：2021-01-06

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Siddharth Maru ,  Tejasvi Das ,  Luke LaPointe ,  Srdjan Marijanovic ,  Zhong You ,  Drew Kinney ,  Anthony S. Doy ,  Eric J. King

IPC: G06F3/041 ,  G06F3/044 ,  G06F3/045 ,  G01D5/243 ,  G01D5/20

Abstract: A system may include a resistive-inductive-capacitive sensor, a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to at a plurality of periodic intervals, measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor. The system may also include a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency and a driving amplitude, wherein at least one of the driving frequency and the driving amplitude varies among the plurality of periodic intervals.

公开(公告)号：US11102583B1

公开(公告)日：2021-08-24

申请号：US16829286

申请日：2020-03-25

Applicant: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR, LTD.

Inventor： Anthony S. Doy ,  Jeffrey A. May

IPC: H04R9/02 ,  H03G5/16 ,  H04R3/00

Abstract: An audio power output circuit provides a pair of output signals to an audio output transducer that has two different voice coils. Using a measured or predicted position of the voice coil assembly with respect to the transducer's magnetic field, a processing circuit generates the pair of signals such that a first relationship between a first one of the pair of output signals and an audio input signal and a second relationship between a second one of the pair of the output signals vary with the position of the voice coil. Offset in the Dynamic Mean Position (DMP) can be compensated for without adding low frequency or direct current components that compromise the dynamic range of the transducer. The efficiency, acoustic output power and/or linearity of the acoustic output of the transducer may be optimized by tailoring the first and second relationship to a particular target performance.

公开(公告)号：US10948313B2

公开(公告)日：2021-03-16

申请号：US16455462

申请日：2019-06-27

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Michael A. Kost ,  Bruce E. Duewer ,  Tejasvi Das ,  Matthew Beardsworth ,  Anthony S. Doy

IPC: G01D5/14 ,  G01D5/24 ,  G01D5/20 ,  G01D5/16

Abstract: A system may include at least one resistive-inductive-capacitive sensor and a control circuit configured to maintain timing parameters for operation of the at least one resistive-inductive-capacitive sensor and vary at least one of the timing parameters to control a spectrum associated with the at least one resistive-inductive-capacitive sensor, wherein the spectrum comprises one of a sensor activity spectrum of the at least one resistive-inductive-capacitive sensor and a current usage spectrum associated with electrical current delivered to the at least one resistive-inductive-capacitive sensor from a source of electrical energy.

公开(公告)号：US10785567B1

公开(公告)日：2020-09-22

申请号：US16903044

申请日：2020-06-16

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Nicholas Roche ,  Anthony S. Doy ,  Itisha Tyagi

IPC: H04R3/00 ,  H04R17/00 ,  H04R29/00

Abstract: A method of fabricating a piezoelectric transducer may include interleaving a plurality of layers of piezoelectric material with a plurality of conductive layers including a first conductive layer, one or more second conductive layers, and one or more third conductive layers, coupling the first conductive layer to a first electrode, wherein an electrical impedance of the first conductive layer varies as a function of a temperature internal to the piezoelectric transducer, and such that a measurement signal indicative of the electrical impedance is generated at the first electrode, coupling the one or more second conductive layers to a second electrode, and coupling the one or more third conductive layers to a third electrode, such that an electrical driving signal driven to the second electrode and the third electrode causes mechanical vibration of the piezoelectric transducer as a function of the electrical driving signal.