1.

What is the transfer function of Butterworth low pass filter of order 2?

A. 1/(s<sup>2</sup>+‚àö2 s+1)
B. 1/(s<sup>2</sup>-‚àö2 s+1)
C. s<sup>2</sup>-‚àö2 s+1
D. s<sup>2</sup>+‚àö2 s+1
Answer» B. 1/(s<sup>2</sup>-‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ2 s+1)


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