GB2556233A - Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise - Google Patents

Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise Download PDF

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Publication number
GB2556233A
GB2556233A GB1721506.2A GB201721506A GB2556233A GB 2556233 A GB2556233 A GB 2556233A GB 201721506 A GB201721506 A GB 201721506A GB 2556233 A GB2556233 A GB 2556233A
Authority
GB
United Kingdom
Prior art keywords
output
pwm
noise
time duration
switches
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1721506.2A
Other versions
GB2556233B (en
GB201721506D0 (en
Inventor
L Melanson John
Lesso Paul
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cirrus Logic International Semiconductor Ltd
Original Assignee
Cirrus Logic International Semiconductor Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cirrus Logic International Semiconductor Ltd filed Critical Cirrus Logic International Semiconductor Ltd
Publication of GB201721506D0 publication Critical patent/GB201721506D0/en
Publication of GB2556233A publication Critical patent/GB2556233A/en
Application granted granted Critical
Publication of GB2556233B publication Critical patent/GB2556233B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/01—Details
    • H03K3/011—Modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2171—Class D power amplifiers; Switching amplifiers with field-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/82—Digital/analogue converters with intermediate conversion to time interval
    • H03M1/822—Digital/analogue converters with intermediate conversion to time interval using pulse width modulation

Abstract

Noise introduced in an output signal of a pulse-width modulator (PWM) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the PWM, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. For example, when a small signal is desired to be output by the PWM, the switches may be operated for shorter time durations. Thus, the switches couple the noise sources to ground for a duration of a cycle to reduce contribution of noise to the output. But, when a larger signal is desired to be output by the PWM, the switches may be operated for longer time durations or the conventional time durations described above.

Description

I, COMPENDEX, INSPEC, IBMTDB (71) Applicant(s):
Cirrus Logic International Semiconductor Limited 7B Nightingale Way, Quartermile, Edinburgh,
EH3 9EG, United Kingdom (72) Inventor(s):
John L Melanson Paul Lesso (74) Agent and/or Address for Service:
Haseltine Lake LLP
Redcliff Quay, 120 Redd iff Street, BRISTOL, BS1 6HU, United Kingdom (54) Title ofthe Invention: Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise
Abstract Title: Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise (57) Noise introduced in an output signal of a pulse-width modulator (PWM) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the PWM, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. For example, when a small signal is desired to be output by the PWM, the switches may be operated for shorter time durations. Thus, the switches couple the noise sources to ground for a duration of a cycle to reduce contribution of noise to the output. But, when a larger signal is desired to be output by the PWM, the switches may be operated for longer time durations or the conventional time durations described above.

Claims (1)

  1. Vdd
    Vss
    FIG. 5
    The international application has entered the national phase early
GB1721506.2A 2015-12-16 2016-06-19 Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise Active GB2556233B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/971,109 US9660632B1 (en) 2015-12-16 2015-12-16 Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise
PCT/US2016/038273 WO2017105544A1 (en) 2015-12-16 2016-06-19 Adjustable time duration for driving pulse-width modulation (pwm) output to reduce thermal noise

Publications (3)

Publication Number Publication Date
GB201721506D0 GB201721506D0 (en) 2018-01-31
GB2556233A true GB2556233A (en) 2018-05-23
GB2556233B GB2556233B (en) 2021-02-24

Family

ID=56507808

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1721506.2A Active GB2556233B (en) 2015-12-16 2016-06-19 Adjustable time duration for driving pulse-width modulation (PWM) output to reduce thermal noise

Country Status (6)

Country Link
US (3) US9660632B1 (en)
EP (1) EP3391541B1 (en)
KR (1) KR102078078B1 (en)
CN (2) CN114421929A (en)
GB (1) GB2556233B (en)
WO (1) WO2017105544A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20163454A1 (en) * 2016-05-16 2017-11-16 St Microelectronics Srl ERROR DETECTION CIRCUIT FOR A PWM PILOT CIRCUIT, ITS RELATED SYSTEM AND INTEGRATED CIRCUIT
CN108718198B (en) * 2018-08-07 2023-11-03 上海艾为电子技术股份有限公司 Digital-analog converter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020034677A (en) * 2000-11-03 2002-05-09 두세진 High-Efficiency Switching Amplifier
US20100085097A1 (en) * 2008-10-06 2010-04-08 Telefonaktiebolaget L M Ericsson (Publ) Pulse-Elimination Pulse-Width Modulation

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6738003B2 (en) 2002-07-08 2004-05-18 Cirrus Logic, Inc. Delta-sigma modulation circuits and methods utilizing multiple noise attenuation bands and data converters using the same
AU2003274541A1 (en) * 2002-11-22 2004-06-18 Koninklijke Philips Electronics N.V. Pwm generator
US6885330B2 (en) 2003-09-05 2005-04-26 Cirrus Logic, Inc. Data converters with ternary pulse width modulation output stages and methods and systems using the same
WO2005101624A1 (en) * 2004-04-13 2005-10-27 System General Corp. Pwm controller having a modulator for saving power and reducing acoustic noise
TWI279987B (en) * 2004-06-04 2007-04-21 Leadtrend Tech Corp Dual-slope adaptive frequency controller with power conversion adjustment
US7023269B2 (en) * 2004-09-08 2006-04-04 Gpe International Limited Digital amplifier and methods for enhancing resolution and dynamic range of a digital amplifier
US7315190B1 (en) * 2006-06-16 2008-01-01 Richtek Technology Corp. PWM circuit and PWM integrated circuit for use in PWM circuit
TWI382647B (en) * 2008-06-06 2013-01-11 Niko Semiconductor Co Ltd The frequency jitter of frequency generator and pwm controller
US8188721B2 (en) * 2008-08-05 2012-05-29 Intersil Americas Inc. Active pulse positioning modulator
US8093951B1 (en) * 2009-04-14 2012-01-10 Cirrus Logic, Inc. Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency
US8773197B2 (en) * 2011-11-22 2014-07-08 Ess Technology, Inc. Distortion correction in class-D amplifiers
US9231565B2 (en) * 2013-05-14 2016-01-05 Infineon Technologies Austria Ag Circuit with a plurality of bipolar transistors and method for controlling such a circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020034677A (en) * 2000-11-03 2002-05-09 두세진 High-Efficiency Switching Amplifier
US20100085097A1 (en) * 2008-10-06 2010-04-08 Telefonaktiebolaget L M Ericsson (Publ) Pulse-Elimination Pulse-Width Modulation

Also Published As

Publication number Publication date
US10230355B2 (en) 2019-03-12
CN108604896A (en) 2018-09-28
US20170222629A1 (en) 2017-08-03
US20180048295A1 (en) 2018-02-15
EP3391541B1 (en) 2020-02-12
US9847773B2 (en) 2017-12-19
US9660632B1 (en) 2017-05-23
GB2556233B (en) 2021-02-24
KR102078078B1 (en) 2020-02-17
KR20180095000A (en) 2018-08-24
EP3391541A1 (en) 2018-10-24
WO2017105544A1 (en) 2017-06-22
CN114421929A (en) 2022-04-29
GB201721506D0 (en) 2018-01-31
CN108604896B (en) 2022-01-28

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