Electrical engineering

Physics

Channel (broadcasting)

Topology (electrical circuits)

CMOS

Modulation (music)

Filter (signal processing)

Analog signal

Operational amplifier

Engineering

Voltage

Common-mode signal

Amplifier

Direct-coupled amplifier

Acoustics

Electronic engineering

Digital signal processing

IEEE Journal of Solid-State Circuits

A class-D amplifier that employs a new modulation scheme and associated output stage to achieve true filter-less operation is presented. It uses a new type of BD modulation that keeps the output common-mode constant, thereby removing a major contributor to radiated emissions, typically an issue for class-D amplifiers. The amplifier meets the FCC class B standard for radiated emissions without any LC filtering. It can accomplish this without any degradation to audio performance and while retaining high efficiency. THD+N is 0.19% at 1 kHz while supplying 5 W to an 8 Ohm load from a 12 V supply. Efficiency is 90% while providing 10 W under the same supply and load conditions. The new output stage occupies 1.8 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> per channel using the high voltage devices of a 0.25 ¿m BCD process.

A 20 W/Channel Class-D Amplifier With Near-Zero Common-Mode Radiated Emissions