ABSTRACT
Figure 8.39 shows the distortion performance of the second-order 510 Hz MFB lowpass filter with an input level of 10 Vrms. As for the Sallen & Key lowpass filter, the use of polyester capacitors causes a broad peak of extra distortion, though here it is centred on 240 Hz rather than 200 Hz. As before, the use of polypropylene capacitors eliminates the extra distortion.
