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Old 2nd June 2006, 12:42 PM   #21
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Join Date: May 2005
Location: Mumbai

As per your suggesstion, I tried simulating with step time much lower. The waveform appears much more continous and sinusoidal, but no change in its amplitude. Its still about 20-25 V.

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Old 2nd June 2006, 12:50 PM   #22
lndm is offline lndm  Australia
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Location: nsw
The Q is quite high. Are you using the centre frequency? For your first circuit this is 159,155Hz (approx)
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Old 2nd June 2006, 06:07 PM   #23
jcx is online now jcx  United States
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In transient analysis of hi Q circuits integration type can be important – euler, trapezoidal integration are somewhat lossy, gear integration can be underdamped – depending on exact impelementation

Really small time step is also important

Even more spice settings come into play as well, you probably need to crank up rel tol, qtol, vtol to higher resolutions

For a great waste of cpu horsepower try noise stimulation:

Click the image to open in full size.

1 MHz bandwidth noise “sweeps” – stimulates all freq < 1 MHz, the ratio in the fft gives the equivalent of the impulse response

peak matching is fortuitously good given the noise in the result – there is obviously less energy exciting the narrower peak so the exact peak is choppy
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Old 3rd June 2006, 03:30 PM   #24
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Join Date: May 2005
Location: Mumbai


Great.! The problem seems to have been solved.

I increased the step points by decreasing step time interval and it worked wonders. Infact I never saw a sine wave as perfect as this before.

I must thank you people for constantly giving me help and support; and replying with loads of information for each of the post in this thread. Its great.

Is there any EBOOK/PDF's in ref. to PSPICE available on net.. which could provide me with some basic tools and insights before i try and simulate any of my ckt design.?

Regards Prasanna
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