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

A fully integrated class-D audio power amplifier using Pulse Width Modulation (PWM) technique is presented. The output stage is an H-bridge with 5.75 mm wide nMOS transistors and 15 mm wide pMOS transistors, which can deliver up to 0.25 W rms to an 16 Omega load. The chip measuring 1.2times2.4 mm 2...

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Bibliographic Details
Published inNorchip 2007 pp. 1 - 4
Main Authors Axholt, A., Oredsson, F., Petersson, T., Wernehag, J., Sjoland, H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2007
Subjects
CMOS process
Frequency
Integrated circuit modeling
MOSFETs
Power amplifiers
Power measurement
Pulse amplifiers
Pulse width modulation
Semiconductor device measurement
Space vector pulse width modulation
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Summary:A fully integrated class-D audio power amplifier using Pulse Width Modulation (PWM) technique is presented. The output stage is an H-bridge with 5.75 mm wide nMOS transistors and 15 mm wide pMOS transistors, which can deliver up to 0.25 W rms to an 16 Omega load. The chip measuring 1.2times2.4 mm 2 , including pads, was fabricated in a 0.35 mum CMOS process. It uses a single 3.3 V supply and a PWM carrier frequency of 2.5 MHz. The chip was designed and simulated with Cadence IC design tools as a student project in the course IC- project and verification at Lund University. The chip was verified and works well with a measured THD+N of 0.5% and efficiency of 76% at 0.25 W rms output power into 16 Omega.
ISBN:9781424415168
1424415160
DOI:10.1109/NORCHP.2007.4481036