Wolfson Microelectronics plc

Class-D amplifier circuits

#2 | 2015-03-12 ✅ Patent 9,287,834 granted on 2016-03-15

US20150071466A1

Read-out for MEMS capacitive transducers

#3 | 2015-01-08 ✅ Patent 9,362,875 granted on 2016-06-07

US20150008962A1

Signal envelope processing

#4 | 2014-10-16 ✅ Patent 9,148,722 granted on 2015-09-29

US20140307910A1

Microphone biasing circuitry and method thereof

#5 | 2014-07-10 ✅ Patent 8,803,261 granted on 2014-08-12

US20140191344A1

MEMS process and device

#6 | 2014-06-19 ✅ Patent 9,301,041 granted on 2016-03-29

US20140169584A1

Headphone device

#7 | 2014-06-12 ✅ Patent 8,987,844 granted on 2015-03-24

US20140161290A1

MEMS device and process

#8 | 2014-06-12 ✅ Patent 9,473,098 granted on 2016-10-18

US20140159816A1

Amplifier circuit

#9 | 2014-06-05 ✅ Patent 9,245,515 granted on 2016-01-26

US20140153733A1

Earphone

#10 | 2014-06-05 ✅ Patent 9,306,448 granted on 2016-04-05

US20140152388A1

Amplifier circuit and methods of operation thereof

#11 | 2014-04-24 ✅ Patent 9,716,476 granted on 2017-07-25

US20140112500A1

DC offset compensation

#12 | 2014-04-24 ✅ Patent 9,558,729 granted on 2017-01-31

US20140112492A1

Digital circuit arrangements for ambient noise-reduction

#13 | 2014-04-17 ✅ Patent 9,224,382 granted on 2015-12-29

US20140105413A1

Noise cancellation

#14 | 2014-03-27 ✅ Patent 8,737,171 granted on 2014-05-27

US20140084396A1

MEMS device and process

#15 | 2013-12-05 ✅ Patent 8,742,970 granted on 2014-06-03

US20130321190A1

Analogue-to-digital converter

#16 | 2013-11-28 ✅ Patent 9,300,212 granted on 2016-03-29

US20130314062A1

DC-DC converters operable in a discontinuous switching mode

#17 | 2013-10-03 ✅ Patent 8,698,256 granted on 2014-04-15

US20130256816A1

MEMS process and device

#18 | 2013-09-19 ✅ Patent 9,020,157 granted on 2015-04-28

US20130243214A1

Active noise cancellation system

#19 | 2013-09-12 ✅ Patent 8,843,227 granted on 2014-09-23

US20130237285A1

Wireless cellular telephone with audio codec

#20 | 2013-08-22 ✅ Patent 9,154,868 granted on 2015-10-06

US20130216060A1

Noise cancellation system

#21 | 2013-08-01 ✅ Patent 9,424,849 granted on 2016-08-23

US20130197920A1

Data transfer

#22 | 2013-05-23 ✅ Patent 9,281,827 granted on 2016-03-08

US20130129114A1

Clock generator

#23 | 2013-05-23 ✅ Patent 8,957,731 granted on 2015-02-17

US20130127531A1

Amplifier circuit with offset control

#24 | 2013-05-16 ✅ Patent 8,854,132 granted on 2014-10-07

US20130120063A1

Amplifier circuit

#25 | 2012-12-27 ✅ Patent 8,508,288 granted on 2013-08-13

US20120326771A1

Charge pump circuit and methods of operation thereof

#26 | 2012-09-27 ✅ Patent 8,514,025 granted on 2013-08-20

US20120242413A1

Amplifier circuit and method of amplifying a signal in an amplifier circuit

#27 | 2012-07-05 ✅ Patent 8,644,523 granted on 2014-02-04

US20120170765A1

Digital circuit arrangements for ambient noise-reduction

#28 | 2012-06-21 ✅ Patent 8,624,669 granted on 2014-01-07

US20120154032A1

DC offset compensation

#29 | 2012-04-26 ✅ Patent 8,831,238 granted on 2014-09-09

US20120099736A1

Noise cancellation system

#30 | 2012-03-15 ✅ Patent 8,331,581 granted on 2012-12-11

US20120065754A1

Pattern detection circuitry

#31 | 2011-11-10 ✅ Patent 8,159,200 granted on 2012-04-17

US20110273151A1

DC-DC converter circuits, and methods and apparatus including such circuits

#32 | 2011-09-29 ✅ Patent 8,660,277 granted on 2014-02-25

US20110235827A1

Amplifier circuit and methods of operation thereof

#33 | 2011-09-15 ✅ Patent 8,198,941 granted on 2012-06-12

US20110221533A1

Amplifier circuit and method of amplifying a signal in an amplifier circuit

#34 | 2011-09-15 ✅ Patent 8,537,957 granted on 2013-09-17

US20110221487A1

Clock synchroniser

#35 | 2011-06-02 ✅ Patent 8,682,250 granted on 2014-03-25

US20110130176A1

Noise cancellation system

#36 | 2011-05-19 ✅ Patent 8,279,012 granted on 2012-10-02

US20110115563A1

Amplifier circuit and methods of operation thereof

#37 | 2011-05-05 ✅ Patent 8,183,931 granted on 2012-05-22

US20110103619A1

Amplifier circuit and methods of operation thereof

#38 | 2011-04-21 ✅ Patent 8,546,170 granted on 2013-10-01

US20110089504A1

MEMS process and device

#39 | 2011-03-03 ✅ Patent 8,824,703 granted on 2014-09-02

US20110055877A1

Amplifier circuit

#40 | 2011-03-03 ✅ Patent 8,541,993 granted on 2013-09-24

US20110050185A1

DC-DC converters operable in a discontinuous switching mode

#41 | 2011-01-27 ✅ Patent 8,612,779 granted on 2013-12-17

US20110022859A1

Power management apparatus and methods

#42 | 2011-01-27 ✅ Patent 8,607,036 granted on 2013-12-10

US20110022826A1

Power management apparatus and methods

#43 | 2011-01-27 ✅ Patent 8,638,155 granted on 2014-01-28

US20110018588A1

Level-shifter circuit

#44 | 2011-01-27 ✅ Patent 8,513,933 granted on 2013-08-20

US20110018516A1

DC-DC converter with low side switch control

#45 | 2011-01-27 ✅ Patent 8,519,691 granted on 2013-08-27

US20110018515A1

Current limiting for DC-DC converters

#46 | 2011-01-27 ✅ Patent 8,729,880 granted on 2014-05-20

US20110018507A1

Switched power regulator with error signal estimation and presetting

#47 | 2010-12-23 ✅ Patent 8,670,571 granted on 2014-03-11

US20100322432A1

Frequency control based on device properties

#48 | 2010-12-16 ✅ Patent 8,433,430 granted on 2013-04-30

US20100317397A1

Cellular wireless telephone and audio codec therefor

#49 | 2010-12-09 ✅ Patent 8,841,737 granted on 2014-09-23

US20100308425A1

MEMS device and process

#50 | 2010-12-02 ✅ Patent 8,645,444 granted on 2014-02-04

US20100306297A1

IIR filter for reducing the complexity of multiplying elements

#51 | 2010-11-04 ✅ Patent 8,264,273 granted on 2012-09-11

US20100277152A1

Charge pump circuit and methods of operation thereof

#52 | 2010-10-21 ✅ Patent 8,737,633 granted on 2014-05-27

US20100266137A1

Noise cancellation system with gain control based on noise level

#53 | 2010-09-30 ✅ Patent 8,482,088 granted on 2013-07-09

US20100244162A1

MEMS device with reduced stress in the membrane and manufacturing method

#54 | 2010-09-02 ✅ Patent 8,687,826 granted on 2014-04-01

US20100219888A1

Amplifier circuit

#55 | 2010-09-02 ✅ Patent 8,643,382 granted on 2014-02-04

US20100219839A1

Apparatus and method for testing a capacitive transducer and/or associated electronic circuitry

#56 | 2010-08-12 ✅ Patent 8,751,025 granted on 2014-06-10

US20100205412A1

Control sequencer

#57 | 2010-08-05 ✅ Patent 8,472,636 granted on 2013-06-25

US20100195842A1

Ambient noise reduction arrangements

#58 | 2010-08-05 ✅ Patent 8,373,506 granted on 2013-02-12

US20100194479A1

Amplifier circuit and methods of operation thereof

#59 | 2010-08-05 ✅ Patent 8,427,121 granted on 2013-04-23

US20100194359A1

Multi-output DC-DC converter

#60 | 2010-07-01 ✅ Patent 8,750,539 granted on 2014-06-10

US20100166229A1

Charge pump circuits

#61 | 2010-07-01 ✅ Patent 8,699,726 granted on 2014-04-15

US20100166228A1

Apparatus and method for biasing a transducer

#62 | 2010-07-01 ✅ Patent 8,581,356 granted on 2013-11-12

US20100164068A1

Semiconductor structures for biasing devices

#63 | 2010-06-24 ✅ Patent 7,856,804 granted on 2010-12-28

US20100155864A1

MEMS process and device

#64 | 2010-04-29

US20100105447A1

AMBIENT NOISE REDUCTION

#65 | 2010-04-15 ✅ Patent 7,948,405 granted on 2011-05-24

US20100091922A1

Sample rate converter

#66 | 2010-03-11 ✅ Patent 7,994,954 granted on 2011-08-09

US20100060498A1

Calibration circuit and associated method

#67 | 2010-03-04 ✅ Patent 7,994,763 granted on 2011-08-09

US20100052638A1

DC-DC converter circuits, and methods and apparatus including such circuits

#68 | 2010-01-28 ✅ Patent 7,949,083 granted on 2011-05-24

US20100020912A1

Clock synchroniser

#69 | 2009-11-12 ✅ Patent 8,068,623 granted on 2011-11-29

US20090279719A1

Capacitive transducer circuit and method

#70 | 2009-11-12 ✅ Patent 8,643,129 granted on 2014-02-04

US20090278217A1

MEMS device

#71 | 2009-10-01 ✅ Patent 7,804,434 granted on 2010-09-28

US20090243902A1

Switched-capacitor circuit

#72 | 2009-09-24 ✅ Patent 7,702,943 granted on 2010-04-20

US20090238323A1

Real time clock

#73 | 2009-06-25 ✅ Patent 8,315,410 granted on 2012-11-20

US20090161889A1

Dynamic range controller

#74 | 2009-06-18 ✅ Patent 8,497,149 granted on 2013-07-30

US20090152655A1

MEMS device

#75 | 2009-05-14 ✅ Patent 8,045,724 granted on 2011-10-25

US20090123003A1

Ambient noise-reduction system

#76 | 2009-03-12 ✅ Patent 7,786,916 granted on 2010-08-31

US20090066552A1

Digital to analog converter circuits and methods of operation thereof

#77 | 2009-03-05 ✅ Patent 7,683,661 granted on 2010-03-23

US20090058497A1

Method to reduce the pin count on an integrated circuit and associated apparatus

#78 | 2009-02-19 ✅ Patent 8,165,312 granted on 2012-04-24

US20090046867A1

Digital circuit arrangements for ambient noise-reduction

#79 | 2009-02-05 ✅ Patent 7,667,508 granted on 2010-02-23

US20090033382A1

Frequency synthesizer

#80 | 2009-02-05 ✅ Patent 7,724,048 granted on 2010-05-25

US20090033376A1

Locked loop circuit

#81 | 2008-12-11 ✅ Patent 7,777,457 granted on 2010-08-17

US20080303502A1

Constant frequency current-mode buck-boost converter with reduced current sensing

#82 | 2008-10-30 ✅ Patent 8,280,937 granted on 2012-10-02

US20080270441A1

Sparse-coded look-up table

#83 | 2008-10-02 ✅ Patent 8,081,770 granted on 2011-12-20

US20080240462A1

Pattern detection circuitry

#84 | 2008-09-18 ✅ Patent 7,626,374 granted on 2009-12-01

US20080224682A1

Voltage reference circuit

#85 | 2008-09-04 ✅ Patent 8,140,465 granted on 2012-03-20

US20080216007A1

Apparatus and method for monitoring and controlling a device under test

#86 | 2008-08-28 ✅ Patent 7,849,245 granted on 2010-12-07

US20080209094A1

Bus-based communication system

#87 | 2008-08-28 ✅ Patent 7,756,164 granted on 2010-07-13

US20080205453A1

Distributing a timing reference over a communications bus

#88 | 2008-07-31 ✅ Patent 7,508,331 granted on 2009-03-24

US20080180292A1

Digital-to-analog converter with dynamic element matching to minimize mismatch error

#89 | 2008-06-26 ✅ Patent 7,622,984 granted on 2009-11-24

US20080150621A1

Charge pump circuit and methods of operation thereof

#90 | 2008-06-26 ✅ Patent 7,990,742 granted on 2011-08-02

US20080150620A1

Charge pump circuit and methods of operation thereof

#91 | 2008-06-26 ✅ Patent 7,626,445 granted on 2009-12-01

US20080150619A1

Charge pump circuit and methods of operation thereof

#92 | 2008-06-19 ✅ Patent 7,567,195 granted on 2009-07-28

US20080143572A1

Digital-to-analog converter using selected single bit converter elements

#93 | 2008-06-05 ✅ Patent 7,649,480 granted on 2010-01-19

US20080129563A1

Calibration circuit and associated method

#94 | 2008-05-22 ✅ Patent 7,714,660 granted on 2010-05-11

US20080116979A1

Amplifier circuit and methods of operation thereof

#95 | 2008-03-20 ✅ Patent 8,208,658 granted on 2012-06-26

US20080069376A1

Amplifier apparatus and method

#96 | 2008-03-06 ✅ Patent 8,204,251 granted on 2012-06-19

US20080056513A1

Amplifier apparatus and method

#97 | 2008-03-06 ✅ Patent 7,723,965 granted on 2010-05-25

US20080055946A1

DC-DC converter circuits, and methods and apparatus including such circuits

#98 | 2008-02-28 ✅ Patent 7,884,558 granted on 2011-02-08

US20080048567A1

Driver apparatus and method

#99 | 2008-01-31 ✅ Patent 8,139,792 granted on 2012-03-20

US20080024213A1

Amplifier circuits, methods of starting and stopping amplifier circuits

#100 | 2008-01-31 ✅ Patent 7,573,152 granted on 2009-08-11

US20080024108A1