A 0.25W fully integrated class-D audio power amplifier in 0.35&amp;#x03BC;m CMOS

Axholt, Andreas; Oredsson, Filip; Petersson, Terese; Wernehag, Johan; Sjöland, Henrik

doi:10.1109/norchp.2007.4481036

Norchip 2007 2007

DOI: 10.1109/norchp.2007.4481036

|View full text |Cite

A 0.25W fully integrated class-D audio power amplifier in 0.35μm CMOS

Andreas Axholt

Filip Oredsson

Terese Petersson

et al.

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2008

2009

Publication Types

Select...

Other4

Relationship

Self Cite0

Independent4

Authors

Journals

Cited by 4 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deployment of traditional linear amplifier, such as the Class-AB type, is therefore not feasible, since power dissipation across the six channels implies thermal management challenge and the need for a large heat sink. The size, weight and cost of such surround sound amplifiers designed using Class-AB principles would also be prohibitive [1].…”

mentioning

confidence: 99%

High fidelity closed-loop pulse width modulated class-D amplifiers

Yu¹

View full text Add to dashboard Cite

High power efficiency, small size and reduced heat dissipation are highly desirable for both the low power and high power devices and the switchedmode Class-D amplifiers can readily satisfy these requirements. However, full adoption of the Class-D technology has been somewhat limited due to concerns such as signal distortion and poor power supply noise rejection. In a welldesigned Class-D amplifier, the intrinsic distortions dominate the linearity performance when the input signal is large and at high frequency. In the first part of this research, a systematic analysis on the intrinsic distortion of the closed-loop Class-D amplifier is investigated based on a largesignal time-domain modeling technique. The audible output components of closed-loop Class-D amplifiers with either AD-or BD-modulated 2 nd-order designs are derived. The expressions are simple, accurate, and clearly reflect the relationship among the input signal, carrier frequency, and the distortion components. In the second part of this research, a novel dual-feedforward carrier modulation topology is proposed for a 2 nd-order Class-D amplifier. The proposed design can be considered a combination of two solutions/steps-a quadratic carrier generator plus two feed-forward signals. It is demonstrated that the THD of the Class-D amplifier using the proposed topology has improved by ten times over a wide range of input signal frequency and magnitude. The adopted low switching frequency also ensures a low switching loss and hence high power efficiency.

show abstract

mentioning

confidence: 99%

High fidelity closed-loop pulse width modulated class-D amplifiers

Yu¹

View full text Add to dashboard Cite

show abstract

NMOS-only Class-D output stages based on charge pump architectures

Maughan

Henderson

2009

2009 IEEE International Symposium on Circuits and Systems

View full text Add to dashboard Cite

An Integrated 3-Level Fully Adjustable PWM Class-D Audio Amplifier in 0.35¿m CMOS

et al. 2008

View full text Add to dashboard Cite

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

A 0.25W fully integrated class-D audio power amplifier in 0.35μm CMOS

Cited by 4 publications

References 3 publications

High fidelity closed-loop pulse width modulated class-D amplifiers

High fidelity closed-loop pulse width modulated class-D amplifiers

NMOS-only Class-D output stages based on charge pump architectures

An Integrated 3-Level Fully Adjustable PWM Class-D Audio Amplifier in 0.35¿m CMOS

Contact Info

Product

Resources

About