Sailesh Chittipeddi - EEWeb
Sailesh Chittipeddi - EEWeb
Sailesh Chittipeddi - EEWeb
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hael Steffes<br />
il - Sr. Applications Manager<br />
den<br />
zards<br />
Sallen-Key<br />
rder High<br />
Active Filter<br />
TECH ARTICLE<br />
The simple Sallen-Key Filter (SKF) applied<br />
to high pass requirements appears fairly<br />
straightforward and simple to implement.<br />
Latent within the design is a risk of capacitive<br />
and/or heavy loading for the op amp driving<br />
into this active filter stage. Most developments<br />
assume an ideal voltage source for the input<br />
signal where the effect of a reactive or heavy<br />
load would be hidden. When multistage<br />
designs are intended using low power op<br />
amps, the load presented by a poorly designed<br />
stage might in fact impair the intended<br />
signal frequency response above the high<br />
pass corner. Some of those tradeoffs will be<br />
exposed here with example designs. Simple<br />
paths to improved performance will be shown<br />
where improved flatness in the desired signal<br />
passband can be achieved.<br />
Visit www.eeweb.com<br />
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