| Abstract |
Switch mode audio power amplifiers are showing up
on market in still greater numbers because of advantages in form
of high efficiency and low total system cost, especially for high
power amplifiers. Several different modulator topologies have been
made, ranging from standard PWM to various self oscillating and
digital modulators. Performance in terms of low distortion, noise
and dynamic range differs significantly with the modulator
topology used. Highest system performance is generally achieved
with analog modulators made as a modulator loop including at
least the power stage of the amplifier, because of benefits from
continuous time operation and non-quantized resolution. This type
of modulator uses no external carrier signal, and is called self
oscillating modulators.
The work presented in this paper refers to switch mode audio
amplifier, but can be used within a wide range of DC-DC or DC-
AC converters as well. |
