Re: Capacitors and resonant frequency
- From: "Charles Schuler" <charleschuler@xxxxxxxxxxx>
- Date: Sun, 29 Oct 2006 15:52:46 -0500
"meyousikmann" <meyousikmann@xxxxxxxxxxxxxxx> wrote in message
news:12ka4ko8dkkco01@xxxxxxxxxxxxxxxxxxxxx
I have a problem that asks about the movement of the second plate of a
capacitor in order to change the resonant frequency by 10 ppm in an LC
circuit. I am getting stuck in terminology.
Here is the information given:
Area of each capacitor plate (one attached to solid nonmoving post while
other can move small distances perpendicular to the plates)
.01 m^2
Initial plate separation
100 micometers
Inductance
120 nH
I have found the initial capacitance and frequency, but the second part of
the question says "How far must the second plate move to change the
resonant frequency by 10ppm". I am not entirely sure what this question
is asking for. Where does ppm fit into any of the calculations. I don't
want answers, but I would appreciate if somebody can translate the
question into something I might understand.
delta f = 10/1e6 x f1
fx = f1 - delta f
solve for new value of C based on fx
solve for new plate spacing based on C
(If I understand the question ;>)
.
- References:
- Capacitors and resonant frequency
- From: meyousikmann
- Capacitors and resonant frequency
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