Integrated Class D audio amplifiers are very power efficient, but require an external filter which prevents further integration. Also due to this filter, large feedback factors are hard to realise, so that the load influences the distortion- and transfer characteristics. The amplifier presented in this paper consists of a switching part that contains a much simpler filter, and a linear part that ensures a low distortion and flat frequency response. A 30W version was realised. The switching part of the amplifier was integrated in a BCD process. Together with a linear part and with a loudspeaker as load, it has a flat frequency response +/- 0.3dB, a dissipation that is up to 5 times lower than a traditional class AB audio amplifier, and a distortion of <0.02% over power and frequency range.
|Title of host publication||Proceedings of the 24th European Solid-State Circuits Conference|
|Place of Publication||The Hague The Netherlands|
|Number of pages||4|
|Publication status||Published - 22 Sep 1998|
|Event||24th European Solid-State Circuits Conference, ESSCIRC 1998 - The Hague, Netherlands|
Duration: 22 Sep 1998 → 24 Sep 1998
Conference number: 24
|Conference||24th European Solid-State Circuits Conference, ESSCIRC 1998|
|Period||22/09/98 → 24/09/98|
van der Zee, R. A. R., & van Tuijl, A. J. M. (1998). A Power Efficient Audio Amplifier Combining Switching and Linear Techniques. In Proceedings of the 24th European Solid-State Circuits Conference (pp. 288-291). The Hague The Netherlands: IEEE.