A high PSRR Class-D audio amplifier IC based on a self-adjusting voltage reference

A high PSRR Class-D audio amplifier IC based on a self-adjusting voltage reference

In a wide range of applications, audio amplifiers require a large Power Supply Rejection Ratio (PSRR) that the current Class-D architecture cannot reach. This paper proposes a self-adjusting internal voltage reference scheme that sets the bias voltages of the amplifier without losing on output dynam...

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Bibliographic Details
Published in:2010 Proceedings of ESSCIRC pp. 118 - 121
Main Authors: Huffenus, A, Pillonnet, Gaël, Abouchi, N, Goutti, Frédéric, Rabary, V, Cittadini, R
Format: Conference Proceeding
Language:English
Published: IEEE 01-09-2010
Subjects:
Capacitors
CMOS integrated circuits
GSM
Noise
Preamplifiers
Resistors
Online Access:Get full text
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Summary:In a wide range of applications, audio amplifiers require a large Power Supply Rejection Ratio (PSRR) that the current Class-D architecture cannot reach. This paper proposes a self-adjusting internal voltage reference scheme that sets the bias voltages of the amplifier without losing on output dynamics. This solution relaxes the constraints on gain and feedback resistors matching that were previously the limiting factor for the PSRR. Theory of operation, design and IC evaluation in a Class-D amplifier in CMOS 0.25μm will be shown in this paper. The use of this voltage reference increased the amplifier's PSRR by 15dB, with only a 140μA increase in current consumption.
ISBN:9781424466627
1424466628
ISSN:1930-8833
2643-1319
DOI:10.1109/ESSCIRC.2010.5619820