can pss simulation predict oscillation of circuits?

pss frequency resolution

Pss simlation can predict the frequency of oscillator.
can pss simulation predict probable oscillation of circuits other than oscillator and give the frequency?
thanks

why we need oscillator

I am not sure about it. In my view, PSS is for large signal simulation.

pss simulasyon

I think I should express the question in anathor word.
for example, we can run the tran simulation and find the oscillation of some circuits. and the pss simulation as we know can predict the frequency of oscillator. so, can pss also predict the probable oscillation of some circuits other than oscillator? and predict its frequency?

pss simulation can give the accurate frequecny of circuits under oscilltion. But you must check oscillator mode and first give the approximate oscillation beat frequecny handly.

both pss and transient sim should be able to predict oscillation of circuits.
pss finds its solution near the beat frequency numerically. that means if there is
periodic steady state solution (namely oscillation), pss will find it as long as you set
the right beat frequency. theoretically, any oscillation can be found by using pss
whether it is oscillation from oscillator or from instability of an amplifier.

but I recommend you to do trans sim with initial condition first, because if you
dont see that in trans sim, chances are that you are not gonna get it in pss.

yes,I also know we should use tran to find out probable oscillation. however,sometimes we need do only frequency domain analysis to measure frequency.pss is a frequency domain simulation,is it?

I wouldnt say pss is a frequency domain simulation. ADS is frequency domain simulation, which means that it converts every useful parameter into frequency domain variable, perform calculation in frequency domain, and convert it back to
time domain. pss is a simulation which finds a solution in time domain. but there is
a limitation. the solution must be periodically steady state. because of this, we need
beat frequency or beat time. pss can not find a solution if the solution of the circuit
is far from beat frequency or beat time. for example, you set a beat frequency of 1GHz, and the circuit oscillates around 650MHz, then you are not gonna have a useful
sim results from that. if you set a beat frequency of 1GHz, and the circuit oscillates
around 2GHz, then you will get meaningful solution assuming the number of harmonics in pss are correct.

if pss and trans sim are both time domain sim, why do we need both?
it's because of narrow band characteristic presented in RF signal. suppose you want
a simulation with a resolution of 10MHz while 1GHz and 1.001GHz signals coexists.
the trans sim will be long and painful to get any meaningful results from the above condition. but by using pss, you can get an answer relatively easy.

if you want to check any possible oscillation presented in the circuit, you need to
do trans sim first. find a oscillation frequency, and run a pss with that oscillation
frequency as a beat frequency, then you will get more accurate results

thank you very much!
I think I understand the difference between them.
as parkyuns said, the pss is normally used for RF circuit,right?
thanks