Loaded Tank circuit lossess -- PSPICE Simulation
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xitronics
diyAudio Member

Join Date: May 2005
Location: Mumbai
Quote:
 Originally posted by xitronics Even with R = 1K, the observed Q in case A is 54, whereas theorotically it comes out to be 10000..!!
Oh a mistake by my calci , therotical value of Q with R = 1K is 100. Anyways, its still deviant.

______________
Prasanna Rao.

 30th May 2006, 12:03 AM #12 lndm   diyAudio Member   Join Date: Mar 2006 Location: nsw In order to obtain a high Q, your source impedance needs to be as high as possible. Maybe you could try using a voltage source instead of the current source and using a large value of discreet resistance in series with this. At least then you would have this control.
 31st May 2006, 12:13 PM #13 rayfutrell   diyAudio Member   Join Date: Sep 2004 Location: virginia The formula for the resonant Q of that parallel RLC circuit is given by Q=R*sqrt(C/L). The Q changes when you change the ratio of C and L. Regards, Ray
 1st June 2006, 01:38 PM #14 jcx   diyAudio Member   Join Date: Feb 2003 Location: .. you might need to dig into spice settings that control the accuracy and defaults of the simulation, in LtSpice a default R damps inductors without explicit Rser declarations, you have to turn it off in the control panel in .ac sim you need to use a very fine frequency grid to hit the 1/(2*pi) * 10e6 resonance exactly, or change component values to match a even frequency with LtSpice I get ~ 1% amplitude difference even with 10000 points/oct freq resolution
 1st June 2006, 04:43 PM #15 jcx   diyAudio Member   Join Date: Feb 2003 Location: .. still had a default inductor Rser= 1 mOhm to clear in the control panel>hacks menu normalized freq - works pretty near perfectly: them's femto dB and pico degrees!
xitronics
diyAudio Member

Join Date: May 2005
Location: Mumbai
Quote:
 Originally posted by jcx you might need to dig into spice settings that control the accuracy and defaults of the simulation.

That's right. But i havent found any data in the model of L in PSPICE; which represents its series DC resistance. Surely, Rseries is the only reason for the non-ideal voltage response in my experiment.

I am trying to go deep into PSPICE and seek that Rseries data for L. If anyone knows regarding it then kindly present them in this thread.

Regards Prasanna.
_______________

xitronics
diyAudio Member

Join Date: May 2005
Location: Mumbai
Now problem in Transient Analysis

Oh great..! The problem for AC sweep is solved. I increased the points/octave value to 10000 and the response is almost perfect.

But the transient reponse is absurd. Its showing amplitude of Vr = 10V at resonance, where should actually be 100V. Whats this problem for..?

I have attached the transient response with this post.

_________________
Regards Prasanna.
Attached Images
 rlc.gif (31.4 KB, 51 views)

 2nd June 2006, 11:42 AM #18 lndm   diyAudio Member   Join Date: Mar 2006 Location: nsw Just a thought, your time stepping seems a little coarse.
xitronics
diyAudio Member

Join Date: May 2005
Location: Mumbai
Quote:
 Just a thought, your time stepping seems a little coarse.

Didnt get it.. .. Could you pls elaborate more on that..

Regds Prasanna
_________

 2nd June 2006, 12:19 PM #20 lndm   diyAudio Member   Join Date: Mar 2006 Location: nsw As spice samples in transient mode, it takes samples at intervals of time. These intervals are referred to as the time step. Your plot looks a little low res (pointy )

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