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Quartz crystal oscillator problem

  1. Nov 23, 2006 #1
    Hello

    I am having difficulty with an assignment problem I have been set. It is an exercise based in Excel. Here is the problem I was given:

    For typical values R = 35 Ohms, L = 150 mH , Cs = 10 fF and Cp = 15pf, evaluate the expression for the impedance (equation (B4)) as a function of frequency in the range .
    Then use equation (1) with Rd = 10 kOhms to evaluate (Vo/Vi) in another column on the same spreadsheet (just assume Vi = 1 V).
    Plot a graph of (Vo/Vi) vs. frequency (again on the same spreadsheet) and ensure that you can see a resonant feature in it. The resonant feature is actually a double-feature, a dip followed immediately by a peak. This double-feature is very sharp, so make sure you use a fine enough frequency interval to observe it. If you do not observe it, check your input values and your calculation.


    The equations referenced in the problem can be found here:
    [​IMG]

    My main problem is that when I draw my graph I am not getting the double feature mentioned in the problem.

    Here is my work so far:
    [​IMG]
    And here is the worksheet with equations on display:
    [​IMG]
    Here is my graph:
    [​IMG]

    Any ideas would be greatly appreciated, I understand this is a rather large demand. I've been stuck on this for days and my head is now fried.
    Thanks.
     
    Last edited: Nov 23, 2006
  2. jcsd
  3. Nov 24, 2006 #2
    I managed to get the problem resolved! Thanks anyway =)
     
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