Low Pass Filter Circuit?
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Low Pass Filter Circuit?

[From: ] [author: ] [Date: 14-02-25] [Hit: ]
707 times the max amplitude.Hope that helps.......
I have a few general questions I'm not too sure about.

First :
Could anyone show/explain why the cutoff frequency is called the 3dB frequency?
I understand that, for example, a low pass filter passes frequencies lower the wc, and reject higher frequencies, but it doesn't really explain 3dB frequency.

Second:
If I have a circuit like this:


-
The link below is relevant and informative.
a) Yes. amplitude and magnitude are the same.
b) Slightly confusing. For this type of circuit the maximum amplitude is at DC (redraw it with the capacitors open-circuit.) wc is the *frequency* (as we're talking w, strictly radian frequency 2*pi*f) at which the output is 0.707 times the max amplitude.

Hope that helps.
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