passive rc band pass

[trils]

hello.

i am trying to plot this passive rc band pass, but i keep getting results that look like a highpass. what am i doing wrong here???

http://i.imgur.com/xF0gPfh.jpg

cheers, trils

[johnsold]

The biggest issue is that you have both of the output terminals connected to ground. Normally the input connection would be to the V1-C3 node and gorund and the output connection would be R3-C2 and ground.

When I simulate your circuit on my Spice simulator I get this:

The flat trace at amplitude = 1 is the input. The high pass trace is the C3-R1-R3 junction and the bandpass trace is R3-C2.

Lynn

[trils]

Hi, thanks a lot for looking at this!

I this the setup you suggested?

unfortunately this doesnt produce the expected result either... very weird...

[johnsold]

I do not have Multisim, but it looks like you are plotting the phase, not the magnitude.  Compare to the lower plot below.

Lynn

[glit]

Hi trils

The signal between the "IN" terminals must be the input signal of your filter (In your design, the power supply, because this is the unfiltered signal).
The signal between the "OUT" terminals must be the output signal of your filter i.e. the filtered signal. (look the attached image)

P.D.:you can also check the magnitude and the phase simultaneously clicking "View" -> "Grapher"

Have a nice day

Diego