I know that SPICE cannot predict noise directly in circuits having a quiescent operating point, like the PLL, but that is what I want to know wether there is some other way of doing the same using HSPICE.jlee said:I suggest to simulate the noise with cadence SPECTRE RF, instead of HSPICE.
Because PLL consists of VCO, which is a non-linear component. Frequency divider is also non-linear. For non-linear circuit, SPICE doesn't simulate well. Instead, you should run SPECTRE .pnoise analyse.