No. Substitute either 0 or ∞ for the load resistance and what you get is not a filter in the sense of having any meaningful properties.But is it possible to design a filter only with an inductor and nothing else?
That is the reflected energy. It's a measure of the efficiency of the filter; how well it's tuned. In this case, I was only using a single inductor with a capacitor on either side; a classic "pi" configuration. I used a Chebyschev formula for a better cutoff at the cost of more ripple (0.3dB) in the passband.Great pics Wookie!
What does the Return,db mean?
Yes. If the Butterworth option is used, it generally hits the -3db point on the nose.Isn't the bandwidth determined by w3db?
Meaning in this case it should be ~1.3KHz, and not 1KHz.
When you say reflected energy, do you mean the total reactive energy exists in the circuit?That is the reflected energy. It's a measure of the efficiency of the filter; how well it's tuned. In this case, I was only using a single inductor with a capacitor on either side; a classic "pi" configuration. I used a Chebyschev formula for a better cutoff at the cost of more ripple (0.3dB) in the passband.
Please don't make my head hurt.Thank you!
When you say reflected energy, do you mean the total reactive energy exists in the circuit?
Meaning V_source * I_source * sin(total_phase) ?
But the article here suggested that it is possible.As f increases,the impedence of L increases therefore L blocks high frequency signals.Can you please clarify?thanksNo. Substitute either 0 or ∞ for the load resistance and what you get is not a filter in the sense of having any meaningful properties.
Someone pls answer this question.Thanks.Hi all,
assuming i want to design a RL filter ,L being series and R being parellel with Vo.
The gain equation would look something like this Vo/Vi= (1/1+(wL/R)^2) right?
Assuming i select a cutoff frequency of 100Hz, using 2*pi*100=R/L,with L=32e-3 i got R=12.06ohms,but after trying to simulate this with Vin=100 Vpeak 60Hz, how come i don't get 100Vpeak at the output since it should pass the whole 60Hz signal?
Hey,Please don't make my head hurt.
I don't pretend to understand all of the math behind it. Math isn't one of my stronger points, to put it mildly. That's why I like using the software packages that do the math for me.
It has to do S-parameters; real and imaginary numbers. How's your Calculus? Mine stinks!
The return loss is very useful for determining the efficiency of the filter (how well it's tuned) in the passband.
If you happen to have a network analyzer equipped with an S-parameter test set, the forward transmission is S-12, the forward return loss is S-11, the reverse transmission is S-21, and the reverse return loss is S-22. (If you're lucky, you might pick up a very old, very used network analyzer that's out of calibration with a dim screen and an S-parameter test set for under $1,000. New network analyzers start out around $5,000 and go up to the stratosphere.)
Confusing? Yep. OK, I'll try to 'splain it.
A network analyzer outputs RF across a selectable range of frequencies, and displays the results on the screen.
It has a number of ports, but if an S-parameter test set is included, the ports of primary interest are ports 1 and 2.
S-12 shows the strength of the signal received at port 2 that was transmitted from port 1 (forward transmission).
S-21 shows the strength of the signal received at port 1 that was transmitted from port 2 (reverse transmission).
S-11 shows the strength of the signal received at port 1 that was transmitted from port 1 (forward return loss).
S-22 shows the strength of the signal received at port 2 that was transmitted from port 2 (reverse return loss).
In the plot I posted, only S-12 (forward transmission) and S-11 (forward return loss) were shown. In many cases, this is all that is necessary.
For a real inductor -- two things:But the article here suggested that it is possible.As f increases,the impedence of L increases therefore L blocks high frequency signals.Can you please clarify?thanks
Please post a schematic!! your description is not clear..... Is it a first order RL circuit? Please adviceSomeone pls answer this question.Thanks.
by Duane Benson
by Jake Hertz
by Jake Hertz
by Duane Benson