New lc oscillator

104

01:14:24

working with oscillators and studying the reason for oscillation stopping at some clock settings and oscillating at other clock settings............this oscillator will show waveform at 1 ms/s  and below but will stop showing waveform at 100 ms/s and above,.................I am trying to wrap my brain around this problem,..................the time setting of the clock should not affect the oscillator, it should show a waveform  either solid band or clearly defined..............Am I wrong? 

published 10 years ago

hurz

10 years ago

This is a typical "subsampling" problem. The simulator does its calculations stepwise. The step size depends on the simspeed you have choosen. E.g. 1ms/s the simulator calcs ever 33.3us (30step per sim periode settings) a dot for the scope. In 100ms/s its just every 3.33ms! But a 1kHz signal needs at least every 0.5ms a sampling point or even better some more if you like to see how the waveform does look like e.g. rectangle or sinewave. So keep the simspeed always close to the expected frequency of your circuit. Hope this helps.

ferlop

10 years ago

Yeah, that makes sense now, I was thinking that EC would act as a real o-scope............. Thanks a million.

jason9

10 years ago

And since it does it in steps, the steps are to far a part to sustain oscillation when sim speed is 100ms/s or above.

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