PHASE NOISE Analysis in Spectre
- From: "michael_skoufis" <skouf1974@xxxxxxxxxxxxxxxx>
- Date: Wed, 22 Mar 2006 15:42:11 -0500
I am trying to run phase noise analysis for a voltage controlled coupled
ring oscillator implemented using differential buffers. Technology is
TSMC 0.18 micron. The problem is that PSS does not converge. As far as I
understand this happens because simulator thinks oscillations don?t ever
start. However according to my transient analysis this is not true. I
have run a lot of simulations on the schematic and I'm confident it works
just fine. My settings for the PSS are the following:
Beat frequency --- 1GHz
Output Harmonics --- 7
Accuracy Default ---moderate
tstab --- 1ns
I have selected ?Oscillator? and specified the oscillator and reference
nodes as the output nodes of the last-stage differential buffer.
Then I selected Pnoise Analysis in the ADE window. I set Sweeptype to
relative and Relative Harmonic to 1. Frequency Sweep Range starts at 10K
and stops at 10M. Sweept type is Linear with a step size of 10K. Maximum
sideband is set to 7. Output is set to Voltage and for the Positive and
Negative outputs I have again selected the two outputs of the differential
buffer. Input Source is none.
Simulation runs for a number of loops and then it fails without converging
(for PSS). Any help is appreciated.
Thanks, Mike
Southern Illinois University
.
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