This session highlights the continuing advances in audio amplifiers to enable improvements in their performance, efficiency, and cost.The techniques revealed include the use of HV tri-level IDAC units with an ISI-mitigating RTDEM scheme to improve the DR of a 14.4V filterless Class-D amplifier (Paper 21.1), and the use of input feedforward and two passive PWM aliasingreduction schemes to improve the wideband linearity of a filterless Class-D amplifier (Paper 21.2).Also included are the use of current feedback to relax the linearity and tolerance of the LC components of a feedback-after-LC Class-D amplifier to save PCB area and BOM cost (Paper 21.3), and the combination of SIMO power-conversion and several analog techniques in a Class-H amplifier to improve efficiency, linearity, and BOM cost (Paper 21.4).
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