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How to simulate the osc/VCO ac response?

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huanchou

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vco ac

Dear all :

I want to simulate the VCO(the delay cell is fully differential type) ac response, but I don't have any idea to do that.
Can I use the method of the fully differential op to do the simulation?
Where can I find the fully differential op simulation method?
 

pss and pac of spectre
 

    huanchou

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If I want to use the HSPICE to do the simulation, how to setup the circuit and command?
 

Used feeback theory. You can break the loop and add a testing voltage source and then see the feedback output response for gain and phase. Then check the gain as if bigger than 1 at wanted frequency. If it is, then the circuit is without startup problem.

Yibin.
 

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