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Transient Simulation of an Oscillator

Question asked by katownse on Apr 29, 2004
Latest reply on May 5, 2004 by wrivas

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I am attempting to do a transient simulation on an closed loop oscillator, with no sources connected other than the dc supply. I also have a transient sine wave signal source connected to a resistive load in the schematic. Neither the transient source nor the resistive load are connected to the oscillator.

When I change the signal generator's frequency and amplitude, I get different results for the transient simulation of the oscillator. If I
remove the signal generator from the schematic, the oscillator results also change.

Any explanation/suggestion as to the reason behind this would be greatly appreciated!

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steve_chen Apr 30, 2004 6:41 AM

Dave Sharrit's input: If the source is sufficiently high in frequency that it dominates the time step control, then it could affect the oscillator analysis results. Or alternatively, if the source is a one of the Transient sources that generates a bunch of breakpoints, that will effect the results.

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wrivas

May 5, 2004 1:31 AM

It is hard to say exactly what is going on without the exact schematic and conditions. However as expressed above this not out of the ordinary, expecially if the frequency value of the oscillator and the source attached to the resistor are several magnitudes different. Yet it all still depends on the exact situation. If you continue to have concerns please contact Technical Support.

http://eesof.tm.agilent.com/support/supp101.html

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steve_chen Apr 30, 2004 6:41 AM
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Dave Sharrit's input: If the source is sufficiently high in frequency that it dominates the time step control, then it could affect the oscillator analysis results. Or alternatively, if the source is a one of the Transient sources that generates a bunch of breakpoints, that will effect the results.
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wrivas May 5, 2004 1:31 AM
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It is hard to say exactly what is going on without the exact schematic and conditions. However as expressed above this not out of the ordinary, expecially if the frequency value of the oscillator and the source attached to the resistor are several magnitudes different. Yet it all still depends on the exact situation. If you continue to have concerns please contact Technical Support.

http://eesof.tm.agilent.com/support/supp101.html
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Transient Simulation of an Oscillator

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