Hi everybody,
I am trying to perform phase noise simulations using the code source founded in the article: "Predicting the Phase Noise and Jitter of PLL-Based Frequency Synthesizers", in the phase domain (actually what I like to do is to perform it in the jitter domain but I found easier to start by the phase).  With some little changes all the modules work O.K. But I have problems once the design has been elaborated and spectre start its job. I am almost sure that  the problem is the iprobe instance necessary in the noise command in spectre, I don’t know how to have a correct iprobe instance to the noise instruction.  Can anybody suggest me a test bench for this design?.  I have attached the testbech I am using now and the error messages I got as well as the top level file.
Thanks in advance.
Felipe


* test bench Spectre file
noise ( out gnd ) noise start=1M stop=100M iprobe=OSC



* Error Message
Analog Kernel using -ANALOGCONTROL  run.scs.

Error found by spectre during hierarchy flattening.
   noise: Invalid component name `OSC' was given as value of parameter `iprobe'.
       Ignored.
   name conflict: value `OSC' of type `scalar string' encountered. Expected value is of
       type `scalar instance'.
   noise: Terminals are not distinct.



* Top module
`include "disciplines.vams"
`include "phase.vams"

module pll(out);
output out;
phase out;
parameter integer m = 1 from [1:inf); // input divide ratio
parameter real Kdet = 1 from (0:inf); // phase detector gain
parameter real Kvco = 1 from (0:inf); // VCO gain
parameter real c1 = 1n from (0:inf); // Loop filter C1
parameter real c2 = 200p from (0:inf); // Loop filter C2
parameter real r = 10K from (0:inf); // Loop filter R
parameter integer n = 1 from [1:inf); // feedback divide ratio
phase in, ref, fb;
electrical c;
   oscillator OSC(in);
   divider #(.ratio(m)) FDm(in, ref);
   phaseDetector #(.gain(Kdet)) PD(ref, fb, c);
   loopFilter #(.c1(c1), .c2(c2), .r(r)) LF(c,gnd);
   vco #(.gain(Kvco)) VCO(c, out);
   divider #(.ratio(n)) FDn(out, fb);
endmodule

Hi,

I am using the same methodology, but not able to get the results, can you share your test bench?