Mark R May DeceasedTopeka, KS

2012015, Jun 21, 2012

Dec 21, 2010

12/975334

Ken A. Strickland - Buda TX, US
Mark W. May - Austin TX, US
Scott Thomas Haban - Austin TX, US

SILICON LABORATORIES, INC. - Austin TX

H04B 1/10

455307

A circuit includes an input terminal for receiving a radio frequency (RF) signal and a noise mitigation circuit coupled to the input terminal. The noise mitigation circuit is configured to detect a low-frequency noise signature in the RF signal and to automatically adjust an attenuation network to filter low-frequency noise from the RF signal in response to detecting the low-frequency noise signature.

2022033, Oct 20, 2022

Apr 14, 2021

17/230789

- Edinburgh, GB
Mark May - Austin TX, US
Eric B. Smith - Austin TX, US
Zhong You - Austin TX, US

H02P 7/29
H02P 7/03
H02P 7/292
G02B 27/64
G02B 7/09
H04N 5/232

An electronic motor control system provides selectable linear and pulse-width modulated (PWM) operation without generating cross-over distortion. The system includes an output stage that has a pair of push-pull drivers each coupled to a terminal of the motor. The electronic motor control system also includes a pulse-width modulated (PWM) driver for providing pulse-width modulated drive signals to an input of the output stage when the pulse-width modulated mode is selected and a linear amplifier stage that provides a linear analog signal to the input of the output stage in linear mode, so that both drivers are operated to supply the current to the motor. In pulse-width modulated mode, a driver is selected for PWM operation, while the other driver is operated to supply a fixed voltage. A feedback control loop motor current and provides outputs to the pulse-width modulator the linear amplifier stage.

2022032, Oct 13, 2022

Mar 31, 2021

17/218992

- Edinburgh, GB
Jun Yan - Austin TX, US
Xiaofan Fei - Austin TX, US
Mark May - Austin TX, US
John L. Melanson - Austin TX, US

H02M 3/158
H02M 1/00
H03F 3/217

A single-inductor multiple output (SIMO) switched-power DC-DC converter for a class-D amplifier provides outputs that are symmetric about a common-mode input voltage of the amplifier, while remaining asymmetric about a return terminal of the amplifier and switching converter. The DC-DC converter includes an inductive element, a switching circuit that energizes the inductive element from an input source, and a control circuit that controls the switching circuit. The control circuit may have multiple switching modes, and in one of the multiple switching modes, the switching circuit may couple the inductive element between outputs of the converter so that stored energy produces a differential change between the voltages of the outputs. The control circuit may implement a first control loop that maintains a common mode voltage of the pair of outputs at a predetermined voltage independent of the individual voltages of the pair of outputs.

2019037, Dec 12, 2019

Jun 4, 2019

16/431276

- Edinburgh, GB
Mark MAY - Austin TX, US
Saurabh SINGH - Cedar Park TX, US
Ramya BALASUNDARAM - Austin TX, US
Mengde WANG - Austin TX, US
Eric B. SMITH - Austin TX, US

Cirrus Logic International Semiconductor Ltd. - Edinburgh

H03M 3/00
H04N 5/232
H03M 1/50
H03M 1/82
H03M 1/12

A system may include an output stage for driving a load at an output of the output stage, a pulse-width modulation mode path configured to pre-drive the output stage in a first mode of operation, a linear mode path configured to pre-drive the output stage in a second mode of operation and a loop filter coupled at its input to the output of the output stage and coupled at its output to both of the pulse-width modulation mode path and the linear mode path. The pulse-width modulation mode path and the linear mode path may be configured such that a first transfer function between the output of the loop filter and the output of the output stage is substantially equivalent to a second transfer function between the output of the loop filter and the output of the output stage

2019001, Jan 10, 2019

Oct 13, 2017

15/783744

- Edinburgh, GB
Eric B. SMITH - Austin TX, US
Mark MAY - Austin TX, US

Cirrus Logic International Semiconductor Ltd. - Edinburgh

H02M 3/158
H02M 1/14
H03F 3/217
H03F 1/02
G01R 33/385

A system may include a first capacitor, a first switched-mode power supply configured to deliver energy from a power source to the first capacitor at an output load of the first switched-mode power supply, a second capacitor having a capacitance larger than the first capacitor, a second switched-mode power supply configured to deliver energy from the power source or a second power source to the second capacitor and one or more switching elements coupled between the first capacitor and the second capacitor. The system may operate in a plurality of modes, including a first mode in which the first switched-mode power supply transfers energy to the first capacitor and the second capacitor, a second mode in which the second capacitor transfers energy to the first capacitor, and a third mode in which first switched-mode power supply transfers energy to the first capacitor and the second capacitor and the second switched-mode power supply transfers energy to the first capacitor and the second capacitor.

2018033, Nov 22, 2018

May 18, 2017

15/598582

- Edinburgh, GB
Anindya Bhattacharya - Austin TX, US
Axel Thomsen - Austin TX, US
Eric Smith - Austin TX, US
Vamsikrishna Parupalli - Austin TX, US
Mark May - Austin TX, US
Johann Gaboriau - Austin TX, US
Junsong Li - Austin TX, US

Cirrus Logic International Semiconductor Ltd. - Edinburgh

G01R 27/26
H03M 3/00

Sensing electronics may be used to measure capacitance of components, such as speakers in mobile devices. A sensing circuit may include a charge-sense front end with sine wave excitation, an analog-to-digital conversion block, and a digital demodulator. The component being measured by the sensing electronics may be excited by a high-frequency sine wave excitation. The digitization of the output from the component may be performed using a bandpass filter synchronized with the excitation signal by centering the bandpass filter near (e.g., within 5% of) the frequency of the excitation signal.

2015022, Aug 6, 2015

Jan 31, 2014

14/170107

- Austin TX, US
Mark May - Austin TX, US

SILICON LABORATORIES INC. - Austin TX

H04B 1/10

In an embodiment, an apparatus includes a component of a receiver path to receive and process an incoming signal. At least one element of the component is controllable based on a DC output of the component, to compensate for a second order intermodulation product of the apparatus. As one example, the component is a differential amplifier including a first transistor and a second transistor.

2015009, Apr 2, 2015

Sep 27, 2013

14/040000

- Austin TX, US
Russell Croman - Buda TX, US
Mike R. May - Austin TX, US
Mark W. May - Austin TX, US
Navin Harwalkar - Austin TX, US
Tim Stroud - Austin TX, US

SILICON LABORATORIES INC. - Austin TX

H03G 3/30

4552401

A radio receiver and method of operating the same are disclosed. In one embodiment, the radio receiver may include a RF receive path configured to convey a first radio signal within a first band to a radio tuning circuit. The RF receive path may be controllable using a first AGC circuit. The radio receiver may also include a loop-through path configured to convey a second radio signal within a second band between an input and an output of the radio receiver. The second band may be different from the first band. The loop-through path may be controllable using a second AGC circuit.