公开(公告)号：US10116215B2

公开(公告)日：2018-10-30

申请号：US14612889

申请日：2015-02-03

Applicant: Cirrus Logic, Inc.

Inventor： Eric Swanson ,  John L. Melanson ,  John C. Tucker ,  Eric J. King

IPC: H02M3/158 ,  H03F1/02 ,  H03F3/181 ,  H03F3/217

Abstract: A switching power stage for producing an output voltage to a load may include a power converter and a controller. The power converter may include a power inductor and plurality of switches arranged to sequentially operate in a plurality of switch configurations. The controller may be configured to, based on a measured parameter associated with the switching power stage, select a selected operational mode of the power converter from a plurality of operational modes, and sequentially apply switch configurations from the plurality of switch configurations to selectively activate or deactivate each of the plurality of switches in order to transfer electrical energy from an input source of the power converter to the load in accordance with the selected operational mode.

公开(公告)号：US10036670B2

公开(公告)日：2018-07-31

申请号：US15162325

申请日：2016-05-23

Applicant: CIRRUS LOGIC, INC.

Inventor： Anindya Bhattacharya ,  Tim Green ,  Jing Bai

IPC: G01K3/00 ,  G01K3/10 ,  G01K7/42 ,  G01K3/02

CPC classification number: G01K3/10 ,  G01K3/02 ,  G01K7/427

Abstract: A peak junction temperature monitoring system for a semiconductor device includes a peak power dissipation sensor for sensing the peak power dissipation in the device. A temperature sensor senses an average temperature of the device, and a peak junction temperature computation circuit generates a signal representative of a peak junction temperature based on input from the peak power dissipation sensor and the temperature sensor.

公开(公告)号：US09980070B2

公开(公告)日：2018-05-22

申请号：US15593170

申请日：2017-05-11

Applicant: Cirrus Logic, Inc.

Inventor： Samuel Ponvarma Ebenezer ,  Seth Suppappola ,  Clifton Cordes

IPC: H04R29/00 ,  H04R1/08 ,  H04R1/32 ,  H04R3/00 ,  G01R31/3167 ,  G01R31/319 ,  G01R31/317 ,  G01R25/00

CPC classification number: H04R29/006 ,  G01R25/00 ,  G01R31/3167 ,  G01R31/31701 ,  G01R31/31901 ,  G01R31/31905 ,  H04R1/083 ,  H04R1/326 ,  H04R3/005 ,  H04R29/004 ,  H04R29/005

Abstract: Test apparatus measuring relative frequency response of first and second microphones includes a rotatable carrier. First and second microphones are sealingly clamped against a mounting surface of the carrier aligned with first and second apertures therein, such apertures lying equidistant from, and on opposite sides of, the carrier's axis of rotation. The carrier initially positions the first microphone closest to an audible signal source, and the responses of the microphones to an audible excitation signal are measured. The carrier is rotated 180 degrees, and the measurements are repeated. Elongated strips of gasket material are used to align the microphones and to form a seal with the carrier. When microphones are mounted deep within an audio device, the audio device is sealingly clamped against a mounting plate, sequentially aligning the mounting plate aperture with first and second apertures of the audio device housing corresponding to first and second microphones disposed therein.

公开(公告)号：US20180040315A1

公开(公告)日：2018-02-08

申请号：US15786701

申请日：2017-10-18

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra ,  Ali Abdollahzadeh Milani ,  Jeffrey Alderson

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/178 ,  G10K2210/108 ,  G10K2210/3012 ,  G10K2210/3017 ,  G10K2210/30231 ,  G10K2210/3028 ,  G10K2210/30391 ,  G10K2210/3226 ,  G10K2210/507 ,  G10K2210/508 ,  G10K2210/511 ,  G10K2210/512 ,  G10L21/0208 ,  G10L21/0364 ,  H04R1/1083

Abstract: A personal audio device, such as a wireless telephone, includes noise canceling that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. The anti-noise signal is adaptively generated to minimize the ambient audio sounds at the error microphone. A processing circuit that performs the adaptive noise canceling (ANC) function also filters one or both of the reference and/or error microphone signals, to bias the adaptation of the adaptive filter in one or more frequency regions to alter a degree of the minimization of the ambient audio sounds at the error microphone.

公开(公告)号：US09847706B2

公开(公告)日：2017-12-19

申请号：US13829945

申请日：2013-03-14

Applicant: Cirrus Logic, Inc.

Inventor： Lingli Zhang ,  Dan Shen ,  Johann Gaboriau

IPC: H02M1/15 ,  H02M3/158 ,  H03K17/16

CPC classification number: H02M1/15 ,  H02M3/1588 ,  H03K17/162 ,  H03K2217/0063 ,  Y02B70/1466

Abstract: In accordance with embodiments of the present disclosure, systems and methods may include an input configured to indicate a switching node voltage of a switching node of a power converter comprising a first switch device coupled at its non-gate terminals between a ground voltage and the switching node and a second switch device coupled at its non-gate terminals between an output supply node and the switching node. The systems and methods may also include a predriver circuit coupled to the input and a gate terminal of the first switch device, the predriver circuit configured to drive an input voltage signal to the gate terminal of the first switch device and configured to select an effective impedance of the gate terminal of the first switch device based on the input.

公开(公告)号：US09807503B1

公开(公告)日：2017-10-31

申请号：US15272169

申请日：2016-09-21

Applicant: Cirrus Logic, Inc.

Inventor： Bryant E. Sorensen ,  Jon D. Hendrix ,  John L. Melanson

IPC: H03G5/00 ,  G10K11/16 ,  H04R3/04 ,  G10K11/178 ,  H04R1/10 ,  H04R5/033 ,  H03G5/16 ,  H04R3/00

CPC classification number: H04R3/04 ,  G10K11/178 ,  G10K11/17815 ,  G10K11/17853 ,  G10K11/17879 ,  G10K2210/1081 ,  G10K2210/3014 ,  G10K2210/3022 ,  G10K2210/3026 ,  G10K2210/3028 ,  G10K2210/3045 ,  G10L21/0208 ,  H03G5/165 ,  H04R1/1083 ,  H04R3/005 ,  H04R5/033 ,  H04R2410/05 ,  H04R2499/11

Abstract: In accordance with embodiments of the present disclosure, an adjustable equalization filter may have a response that generates an equalized source audio signal from a source audio signal to account for effects of changes in an electro-acoustical path of the source audio signal to a transducer. An equalizer coefficient control block may adapt the response of the adjustable equalization filter in response to changes in a response of a secondary path estimate filter for modeling the electro-acoustical path of a source audio signal through the transducer, wherein a response of the secondary path estimate filter is adapted in conformity with an error microphone signal indicative of the acoustic output of the transducer.

公开(公告)号：US09768689B1

公开(公告)日：2017-09-19

申请号：US14183096

申请日：2014-02-18

Applicant: Cirrus Logic, Inc.

Inventor： Ullas Pazhayaveetil ,  Jeffrey May ,  Gautham D. Kamath ,  Michael Kost

IPC: H02M3/158 ,  H02M3/156

CPC classification number: H02M3/158 ,  G01R21/06 ,  G01R27/2611 ,  G06F1/3203 ,  H02M3/156 ,  H03F3/187 ,  H03F3/2175 ,  H03G3/004

Abstract: Thermal levels in an inductor of a boost converter may be managed by implementing peak current limits for the boost converter. For example, an inductor may be allowed to conduct above a certain peak current limit for a certain period of time before the current is reduced by a controller to a low current limit. The controller may hold the low current limit in place for a certain period of time, after which the current through the inductor is allowed to again exceed the low current limit. However, if the high current limit is again exceeded or sustained for a certain period of time, the low current limit may be again imposed by the controller.

公开(公告)号：US09705458B1

公开(公告)日：2017-07-11

申请号：US14812405

申请日：2015-07-29

Applicant: Cirrus Logic, Inc.

Inventor： John Christopher Tucker ,  Daniel John Allen ,  John L. Melanson ,  Ammisetti Prasad

IPC: H03G3/00 ,  H03G3/30 ,  H03F3/183

CPC classification number: H03G3/004 ,  H02M3/07 ,  H03F1/0227 ,  H03F1/025 ,  H03F3/183 ,  H03F2200/03 ,  H03F2200/211 ,  H03F2200/507 ,  H03G3/20 ,  H03G3/3031

Abstract: An energy-efficient consumer device audio power output stage with gain control provides improved battery life and reduced power dissipation without clipping the audio output signal. A control circuit controls a power supply that supplies the power supply rails to the power amplified output stage. The voltage of the power supply rails is controlled in conformity with an input audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The gain applied to the audio input signal is reduced for a predetermined time period when a higher output voltage of the power supply is selected, to avoid clipping the audio output signal.

公开(公告)号：US09704472B2

公开(公告)日：2017-07-11

申请号：US14101893

申请日：2013-12-10

Applicant: Cirrus Logic, Inc.

Inventor： Nitin Kwatra

IPC: G10K11/178 ,  H04R1/10 ,  H04R25/00

CPC classification number: G10K11/178 ,  G10K11/17817 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1081 ,  H04R1/1083 ,  H04R25/00 ,  H04R2460/01 ,  H04R2460/15

Abstract: Systems and methods of the present disclosure include analyzing and comparing transfer functions associated with a plurality of electro-acoustic paths for transducers of a personal audio device to determine proximity of the transducers to respective ears of a listener of the personal audio device, quality of acoustic seals associated with the transducers, and for one or more other purposes.

公开(公告)号：US09680488B2

公开(公告)日：2017-06-13

申请号：US15050857

申请日：2016-02-23

Applicant: Cirrus Logic, Inc.

Inventor： Tejasvi Das ,  John L. Melanson ,  John C. Tucker ,  Xiaofan Fei

IPC: H03M1/78 ,  H03M1/00 ,  H03M1/08 ,  H03M1/66 ,  H03M1/70 ,  H03M1/68 ,  H03M3/00

CPC classification number: H03M1/002 ,  H03M1/0845 ,  H03M1/66 ,  H03M1/662 ,  H03M1/68 ,  H03M1/70 ,  H03M1/785 ,  H03M3/32 ,  H03M3/392 ,  H03M3/414 ,  H03M3/416 ,  H03M3/50

Abstract: In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths including a first processing path and a second processing path, a digital-to-analog stage output, and a controller. The first processing path may include a first digital-to-analog converter for converting the digital input signal into a first intermediate analog signal, the first digital-to-analog converter configured to operate in a high-power state and a low-power state. The second processing path may include a second digital-to-analog converter for converting a digital input signal into a second intermediate analog signal. The digital-to-analog stage output may be configured to generate an analog signal comprising a sum of the first intermediate analog signal and the second intermediate analog signal. The controller may be configured to operate the first digital-to-analog converter in the lower-power state when a magnitude of the digital input signal is below a threshold magnitude.