Xin Zhao

US Patent:

57268550, Mar 10, 1998

Filed:

Aug 15, 1995

Appl. No.:

8/515761

Inventors:

Gerard Mourou - Ann Arbor Twp. MI
Alan Braun - Ann Arbor MI
Jean-Claude Diels - Albuquerque NM
Marcel Bouvier - Ann Arbor MI
Xin Miao Zhao - Austin TX

Assignee:

The Regents of The University Of Michigan - Ann Arbor MI
The University of New Mexico - Albuquerque NM

International Classification:

H01H 322

US Classification:

361213

Abstract:

An apparatus and method for enabling the creation of multiple extended conduction paths in the atmosphere including a chirped-pulse amplification laser system having a high peak-power laser capable of transmitting through the atmosphere a high-peak power ultrashort laser pulse. The laser pulse is configured to have a rough spacial profile and is of sufficient energy to create multiple electrically conductive ionized channels in the atmosphere.

US Patent:

20220329212, Oct 13, 2022

Filed:

Jun 16, 2021

Appl. No.:

17/348982

Inventors:

- Edinburgh, GB
Xin Zhao - Austin TX, US
Jing Bai - Austin TX, US
John L. Melanson - Austin TX, US
Ku He - Austin TX, US
Wai-Shun Shum - Austin TX, US
Xiaofan Fei - Austin TX, US
Alan M. Morton - Austin TX, US

International Classification:

H03F 1/32
H04R 3/02
H04R 29/00
H03F 3/183

Abstract:

An amplification system with an output driver stage for providing an output signal to acoustic output transducers such as speakers or haptic output devices removes signal distortion caused by output stage non-linearities by pre-distorting an input signal. The system includes the output driver stage, an input stage for receiving the input signal, and a processing block that receives the input signal and provides an output signal to the output driver stage. The processing block includes a pre-distortion circuit that applies a pre-distortion function to the input signal to generate the output signal if a signal level of the input signal is greater than a threshold amplitude, and if the signal level is less than or equal to the threshold amplitude, generates the output signal from the input signal by bypassing the pre-distortion circuit.

US Patent:

20220284877, Sep 8, 2022

Filed:

Dec 2, 2021

Appl. No.:

17/540376

Inventors:

- Edinburgh, GB
Kemal S. Demirci - Dallas TX, US
David M. Olivenbaum - Austin TX, US
Amar Vellanki - Cedar Park TX, US
Xin Zhao - Austin TX, US
Wai-Shun Shum - Austin TX, US
Xiaofan Fei - Austin TX, US

International Classification:

G10K 11/178
H04R 3/00

Abstract:

An audio processing system reduces perception of audible artifacts due to changes in an element in an audio channel of the audio processing system. The system reproduces an audio input signal and produces an audio output signal with the audio channel. The channel has an adjustable or selectable element that, responsive to a control signal, changes a characteristic of the audio processing channel, which generates a transient in the audio output signal. The systems include a level detector for measuring a signal level of the audio input signal and a controller responsive to an output of the level detector to determine a masking time interval available from the audio output signal due to signal content in the audio input signal. The controller generates the control signal to change the characteristic of the audio processing channel so that at least a portion of the transient occurs in the masking time interval.

US Patent:

20230082721, Mar 16, 2023

Filed:

Nov 3, 2022

Appl. No.:

17/980429

Inventors:

- Edinburgh, GB
Michael A. KOST - Cedar Park TX, US
Anthony S. DOY - Los Gatos CA, US
Tejasvi DAS - Austin TX, US
Siddharth MARU - Austin TX, US
Xin ZHAO - Austin TX, US
Matthew BEARDSWORTH - Austin TX, US
Bruce E. DUEWER - Round Rock TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

G01R 27/28
G01R 27/26
G01R 27/02
G01H 13/00
G01L 9/00
G06F 3/01

Abstract:

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

US Patent:

20200386804, Dec 10, 2020

Filed:

Oct 21, 2019

Appl. No.:

16/658755

Inventors:

- Edinburgh, GB
Siddharth MARU - Austin TX, US
Xin ZHAO - Austin TX, US
Matthew BEARDSWORTH - Cedar Park TX, US
Michael A. KOST - Austin TX, US
John L. MELANSON - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

G01R 29/18

Abstract:

A system may include a sensor having a variable phase response, a dummy impedance having a known phase response, and a measurement circuit communicatively coupled to the sensor and configured to measure first phase information associated with the sensor, measure second phase information associated with the dummy impedance, and determine a phase response of the measurement circuit based on a comparison of the first phase information to the second phase information.

US Patent:

20200271706, Aug 27, 2020

Filed:

Jul 19, 2019

Appl. No.:

16/517046

Inventors:

- Edinburgh, GB
Michael A. KOST - Cedar Park TX, US
Anthony S. DOY - Los Gatos CA, US
Tejasvi DAS - Austin TX, US
Siddharth MARU - Austin TX, US
Xin ZHAO - Austin TX, US
Matthew BEARDSWORTH - Austin TX, US
Bruce E. DUEWER - Round Rock TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

G01R 27/28
G01L 9/00
G01H 13/00
G01R 27/26

Abstract:

A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.

US Patent:

20200177167, Jun 4, 2020

Filed:

Feb 7, 2020

Appl. No.:

16/784392

Inventors:

- Edinburgh, GB
Tejasvi DAS - Austin TX, US
Xin ZHAO - Austin TX, US
Lei ZHU - Austin TX, US
Xiaofan FEI - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

H03K 3/01
H03K 17/687

Abstract:

A driver system may include a first n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a first terminal of a supply voltage and configured to drive the output when the first n-type field-effect transistor is activated, a second n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a second terminal of the supply voltage and configured to drive the output when the second n-type field-effect transistor is activated, a high-side capacitor coupled to the output of the driver system, and a low-side capacitor coupled to the second terminal of the supply voltage, wherein the high-side capacitor and the low-side capacitor are configured to track and correct for mismatches between a first resistance of the first n-type field-effect transistor and a second resistance of the second n-type field-effect transistor.

US Patent:

20200058326, Feb 20, 2020

Filed:

Aug 14, 2018

Appl. No.:

16/103288

Inventors:

- Edinburgh, GB
Tejasvi Das - Austin TX, US
Xin Zhao - Austin TX, US
Xiaofan Fei - Austin TX, US

Assignee:

Cirrus Logic International Semiconductor Ltd. - Edinburgh

International Classification:

G11B 27/034
G11B 27/19

Abstract:

A polymorphic playback system is disclosed in which one or more parameters of a signal path of the polymorphic playback system are varied based on one or more characteristics of a playback signal processed by the signal path, wherein the polymorphic playback system may include a lower-latency detection filter, a higher-latency detection filter, and a control subsystem that uses the lower-latency detection filter for detecting the one or more first characteristics of the playback signal and uses the higher-latency detection filter for detecting the one or more second characteristics of the playback signal.