I am designing an injection locked vco. My simulation scenario for the phase noise is as follows:
1. Run the vco without the injection signal for 2 microseconds ; let it setttle to the free running frequency;
2. Start the injection signal and observe the phase noise...
Well, I need a periodic vsine source to generate the injection signal in the schematic; and this is the very source of an error in my pss simulation:
" 'V0' is a periodic input signal, which is inconsistent with autonomous circuits. "
this is what happens if I set cadence for phase noise simulation using the instructions given in the cadence Spectre manual.
I know... the instructions are for a 'normal' vco; but I was hoping that it would work for my injection locking case as well.
Question, as obvious it is by now :), how do we simulate the injection locked oscillator phase noise ?
Is there a way to conceal the periodic voltage source in the circuit so as not to piss the pss off ?