Problems with Seiler VCO transient simulation time

[zaren678]

Seiler VCO problems

I'm trying to design a VCO from 328 to 482 MHz. I'm starting with making an oscillator at 328 MHz and have been doing transient simulations which take forever. Is there a way I can use HB to simulate the oscillation frequency so that I can try and optimize the circuit faster?? Any help would be appreciated.



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[mvs sarma]

Seiler VCO problems

Whether R4 needs to be decoupled?
Sarma

 

[zaren678]

Re: Seiler VCO problems

I'm not sure I understand.

I've pretty new to ADS and to RF circuit design as it is. I've been doing solely transient analysis and FFT to determine the frequency of oscillation of my oscillator but transient analysis takes forever to run. I was wondering if there was a faster way.

 

[svia]

Re: Seiler VCO problems

In this book they describe another way to do it.

Stability Analysis of Nonlinear Microwave Circuits by por Almudena Suárez

 

[ramaraju]

Re: Seiler VCO problems

are used s2p file there2.whose ft should have 2g hz

 

[moghtada]

Seiler VCO problems

Why dont you use HB simulation? It is very fast and accurate.

 

[mvs sarma]

Re: Seiler VCO problems

I'm not sure I understand.

I've pretty new to ADS and to RF circuit design as it is. I've been doing solely transient analysis and FFT to determine the frequency of oscillation of my oscillator but transient analysis takes forever to run. I was wondering if there was a faster way.

can you put a 0.1uF cap just at R4 L1 junction to ground and then run the analysis again please, and watch the difference