ACTIVE_HP_FILTER_

Published:2009/7/13 11:04:00 Author:May | From:SeekIC

Interchanging the resistors and capacitors transforms the normalized low-pass filter into a high-pass filter with the same corner frequency (a). Notice that the Sallen-Key filter must be modified according to impedance levels at each node. This yields a filter with equal-value capacitors and unequal-value resistors, an improvement over the traditional low-pass design of equal-value resistors and unequal-value capacitors. The graphs in (b) indicate that the normalized high-pass filter compares favorably with the Sallen-Key filter in high-pass applications.



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