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68 Some Tools and Examples <strong>of</strong> Filter Synthesis<br />

Check the result by evaluating the two equations at w= 0 and w = I<br />

radian.<br />

3.19. The Butterworth input resistance function for a three-element lowpass<br />

network is<br />

1<br />

R(w)= '+w6 '<br />

The corresponding Z,(s) function would be<br />

Z,(S)=-'-6 .<br />

1-s<br />

The Gewertz method yields the corresponding input impedance function:<br />

lS2+~s+1<br />

Z () 3 3<br />

RLC S = s3+2s'+2s+ I<br />

Obtain the partial fraction expansions <strong>of</strong> Z,(s) and <strong>of</strong> ZRLC

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