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› How to make VCO start to oscillate in ultrasim?
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How to make VCO start to oscillate in ultrasim? (Read 7817 times)
ahhfyz
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Posts: 5
How to make VCO start to oscillate in ultrasim?
Jan 05
th
, 2012, 8:57pm
Hi, everyone!
I am a beginner in ultrasim. Now I try to simulate a vco in ultrasim. sim_mode is set to "a(analog)", and speed is "1", but it cannot start to oscillate.
I guess it is a tolerence problem, but don't know how to further set tol.
Regards!
Yang
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raja.cedt
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Germany
Re: How to make VCO start to oscillate in ultrasim?
Reply #1 -
Jan 6
th
, 2012, 2:06am
you have to use initial condition in ultrasim as well
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weber8722
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Re: How to make VCO start to oscillate in ultrasim?
Reply #2 -
Jan 10
th
, 2012, 5:50am
Hi, I would add a little vpwl or ipwl source to kick-start the oscillator. This should work independent to any simulator (hspice, spectre, ultrasim, ams-designer,...).
Bye Stephan
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raja.cedt
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Re: How to make VCO start to oscillate in ultrasim?
Reply #3 -
Jan 12
th
, 2012, 10:07am
hello Stephan,
i guess in altrasim you don't have pulse input i guess.
Thanks,
Raj.
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ahhfyz
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Re: How to make VCO start to oscillate in ultrasim?
Reply #4 -
Jan 12
th
, 2012, 10:39pm
weber8722 wrote
on Jan 10
th
, 2012, 5:50am:
Hi, I would add a little vpwl or ipwl source to kick-start the oscillator. This should work independent to any simulator (hspice, spectre, ultrasim, ams-designer,...).
Bye Stephan
Setting "initial condition" can kick-start the oscillator, but ipwl fails.
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