[time-nuts] Spice simulation of PSRR and phase noise

Rafael Gajanec rgajanec at vercet.com
Sun Oct 22 15:20:52 UTC 2017

Dear Attila,

you haven't specified what sort of circuits would you like to simulate, 
but maybe the answer is Harmonic Balance. Have a look at 
http://qucs.sourceforge.net/ and 

HSPICE from Synopsis and ADS from Keysight (which I use) also have the 
HB engine.

Best regards,
Rafael Gajanec

On 22-Oct-17 4:23 PM, Dana Whitlow wrote:
> Hello Attila,
> It seems to me that an AC simulation could never work since the
> very generation of phase noise by the mechanisms that matter is
> a modulation process at heart, automatically forcing one into the
> realm of transient simulations.
> But I am surprised about the simulation times that you speak of.
> Would you be willing to post some information detailing your
> methodology and an example "simple" circuit?
> Dana
> On Sun, Oct 22, 2017 at 7:53 AM, Attila Kinali <attila at kinali.ch> wrote:
>> Hi,
>> I have been looking into spice simulations of circuits, in particular
>> trying to extract PSRR and phase noise information. Unfortunatelly,
>> the obvious way of putting AC sources at the right places does not
>> work, as the (ideal) input signals are not small and drive the circuit
>> into non-linearities. Hence I have to do transient simulations.
>> But extracting PSRR and phase noise information out of a transient
>> simulation is cumbersome at best and takes a lot of simulation time
>> (we are talking about hours to days for simple circuits).
>> I am looking for guidelines and hints how to speed things up.
>> Maybe even being able to use standard DC and AC analysis for the
>> circuit instead of transient. Unfortunately, my google-foo was not
>> strong enough to find approriate documentation.
>> Does someone have any hints what I should read or search for?
>> Thanks in advance
>>                          Attila Kinali
>> --
>> It is upon moral qualities that a society is ultimately founded. All
>> the prosperity and technological sophistication in the world is of no
>> use without that foundation.
>>                   -- Miss Matheson, The Diamond Age, Neil Stephenson
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