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ACTIVE_HP_FILTER_

2017-02-14 12:46  
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ACTIVE_HP_FILTER_
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.