Patent · US Active

Digital amplifier

US7907010B2 · kind B2 · utility

86Cited by

6References

17Claims

0Family size

Assignee

NXP B.V. · NL

Inventors

Matthias Wendt · Neu-Anspach, DE
Iain Mosely · Pangbourne, GB
F. Javier Esguevillas · Cambrils, ES
Thomas Durbaum · Baiersdorf, DE
Georg Sauerlander · Aachen, DE
Heinz Van Der Broeck · Zülpich, DE

Key dates

Filing date	Mar 25, 2004
Grant date	Mar 15, 2011
Priority date	—
Expiry date	Jun 10, 2026

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2200/459
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

Recently, the use of class-D audio amplifiers has become more and more widespread. In contrast to the generally employed class-AB linear amplification technology, class-D allows for improved efficiency. However, the class-D principle is known for its poor distortion characteristics. According to the present invention a digital amplifier (18) is provided for converting an audio signal to a power output, comprising a ripple suppression circuit (16) for suppressing voltage ripples in a supply voltage supplied to the bridge circuit with (6) at least one pair of switches. The ripple suppression circuit (16) suppresses ripples in the supply voltage supplied to a switch in the bridge circuit (6), which has been found to cause a major part of the distortions in the output signal of the digital amplifier (18).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.