The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> How to start up quadrature vco https://designers-guide.org/forum/YaBB.pl?num=1192608810 Message started by shawn on Oct 17th, 2007, 1:13am

Title: How to start up quadrature vco Post by shawn on Oct 17th, 2007, 1:13am Hello all, Now I have a problem to start up a quadrature LC vco.  I tried to add initial condition (voltage=3.3v)at the node 1,as you can see from the figure attached. I tried to edit the size of mos transistors, varactors, inductor, but did not work. Finally what the best I get is some triangle waveform, and the amplitude is several mv. evidently, this is not right. So, what should I do to start up the qvco correctly, I mean, what is the steps? Should separate one vco for simulating half the qvco and at last combine the two as quadrature or just simulate together. I am very appreciate if can get some tutorials for vco simulation. Thank you very much.

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