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Design a Composite low pass filter by image parameter method for following specifications: R0=50Ω,fc=50MH2,f∞=52 MH2
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written 2.5 years ago by |
Solution:
z0=R0=√LC=50Ω
with constant −k section low pass filter,
WC=2√LC=2πfCC∴2π×50MH2=2√LC⇒50π×106=1√LC∴√LC=150π×106∴LC=4.05×10−17
∴LC=2500∴L=2500C∴2500C2=4.05×10−17∴C=0.127nF∴L=0.318MH
m-derived low pass filter:
m=√1−f2cf2∞=√1−502522HH2=0.274L/2=0.159μH,C=0.127nFmL2=0.043μH,mC=0.034nF(1−m24 m)2L=0.268μH
1lp \& Olp matching sectious:
0.3 L=0.095μH0.3C=0.038nF(8]15)L=0.1696μH