This paper presents a CDA using a GaN-based output stage to achieve high switching frequency and good efficiency simultaneously, and an integrated controller implemented in a 180nm CMOS technology to compensate for the LC filter nonlinearity. Switching at 1.8 MHz, the CDA can deliver a maximum of 155W from a 50V supply into a 4Ω load with a peak efficiency of 91.7%. It achieves a peak THD+N of -95.6 dB (0.0017%) while allowing the use of cheaper and smaller nonlinear LC components.
