RCL lowpass design

Thread Starter

Homie

Joined Nov 15, 2007
3
Hi there, i need help with the methode of designing a RCL lowpass filter. I know the -3dB frequency 70MHz and i know the quality factor 0,7. But i just forgot how to get started and what formulas to use :(
Thomas
 

Thread Starter

Homie

Joined Nov 15, 2007
3
Yea thanks ive red that, but i just forgot what to do first. I have the transfer function for the filter, and i know the wo(2*pi*70000000) and Q(0,7) but what do i do first?? I cant remember if i have to match the impedans of the filter with the rest of the circuuit and/or what other things i have to consider.
 

Thread Starter

Homie

Joined Nov 15, 2007
3
Now i think ive founded my components for my filter. But but i have som difficulties understanding my simulations. Because i keep getting +db in the low frequencies and my aim was to get 0db in dc gain. And when i look at the formula for the lowpass filter, the nominator is 1/LC. Can anybody tell me what im doing wrong??
 
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