The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Sep 20th, 2019, 12:20am
Pages: 1
Send Topic Print
pss does not converge (Read 5599 times)
sanazadib
New Member
*
Offline



Posts: 9

pss does not converge
Oct 30th, 2016, 8:57am
 
Hi everyone
I design clock generator that create four non overlap clock at 1 GHZ,in fact I have four non overlap clock which each one has frequency of 1Ghz
I can do transient analysis and it gives me four non overlap clock at 1Ghz,however when I do PSS analysis I got converge problem,it said it does not converge .
I change tstab and some parameter but still give me this error
anybody have any idea?
Thanks in advance
Back to top
 
 
View Profile   IP Logged
Geoffrey_Coram
Senior Fellow
******
Offline



Posts: 1975
Massachusetts, USA
Re: pss does not converge
Reply #1 - Nov 1st, 2016, 8:09am
 
I think I remember reading that PSS can have convergence difficulties if any of the clocks is transitioning at the end of the period.
Back to top
 
 

If at first you do succeed, STOP, raise your standards, and stop wasting your time.
View Profile WWW   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #2 - Nov 1st, 2016, 12:32pm
 
Actually I did transient analysis and I create layout for my clock generator  ,and this is my RLC extraction from clock generator
Back to top
 

Picture2_001.png
View Profile   IP Logged
Ken Kundert
Global Moderator
*****
Offline



Posts: 2220
Silicon Valley
Re: pss does not converge
Reply #3 - Nov 1st, 2016, 4:32pm
 
Autonomous or driven?
Back to top
 
 
View Profile WWW   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #4 - Nov 2nd, 2016, 7:23am
 
Actually I inject 4GhZ Clock generator and it gives me four non overlap clock at 1Ghz,structure of clock is consist of flipflop(transmission gate and inverter) ,inverter  .nor gate and so on
I try different tstab,different tolerance option ,still did no work
result that I show above is transient result where I did RLC extraction
Back to top
 
 
View Profile   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #5 - Nov 2nd, 2016, 3:22pm
 
*************************************************
Periodic Steady-State Analysis `pss': fund = 4 GHz
**************************************************
Trying `homotopy = gmin' for initial conditions.

Notice from spectre during IC analysis, during periodic steady state analysis `pss'.
   GminDC = 1 pS is large enough to noticeably affect the DC solution.
       dV(I0.I171|I1|T3:int_d) = -93.7384 mV
       Use the `gmin_check' option to eliminate or expand this report.
   Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is recommended for possible improvement of convergence.

DC simulation time: CPU = 899.863 ms, elapsed = 900.905 ms.

===============================
`pss': time = (0 s -> 20.25 ns)
===============================

Output and IC/nodeset summary:
                save   1357    (current)
                save   4238    (voltage)

Important parameter values in tstab integration:
   start = 0 s
   outputstart = 0 s
   stop = 20.25 ns
   period = 250 ps
   maxperiods = 20
   step = 20.25 ps
   maxstep = 10 ps
   ic = all
   useprevic = no
   skipdc = no
   reltol = 1e-03
   abstol(V) = 1 uV
   abstol(I) = 1 pA
   temp = 27 C
   tnom = 27 C
   tempeffects = all
   method = gear2
   lteratio = 3.5
   relref = sigglobal
   cmin = 0 F
   gmin = 1 pS

   pss: time = 486.4 ps     (2.4 %), step = 3.854 ps      (19 m%)
   pss: time = 506.7 ps     (2.5 %), step = 488.8 fs    (2.41 m%)
   pss: time = 907.1 ps    (4.48 %), step = 564.8 fs    (2.79 m%)
   pss: time = 1.373 ns    (6.78 %), step = 2.734 ps    (13.5 m%)
   pss: time = 1.519 ns     (7.5 %), step = 1.12 ps     (5.53 m%)
   pss: time = 2 ns        (9.88 %), step = 1.692 ps    (8.36 m%)
   pss: time = 2.463 ns    (12.2 %), step = 2.118 ps    (10.5 m%)
   pss: time = 2.531 ns    (12.5 %), step = 675.8 fs    (3.34 m%)
   pss: time = 3.076 ns    (15.2 %), step = 2.231 ps      (11 m%)
   pss: time = 3.545 ns    (17.5 %), step = 1.011 ps    (4.99 m%)
   pss: time = 4.137 ns    (20.4 %), step = 779.8 fs    (3.85 m%)
   pss: time = 4.557 ns    (22.5 %), step = 1.441 ps    (7.12 m%)
   pss: time = 5.016 ns    (24.8 %), step = 946.5 fs    (4.67 m%)
   pss: time = 5.411 ns    (26.7 %), step = 563.4 fs    (2.78 m%)
   pss: time = 5.569 ns    (27.5 %), step = 2.164 ps    (10.7 m%)
   pss: time = 6.006 ns    (29.7 %), step = 733.7 fs    (3.62 m%)
   pss: time = 6.427 ns    (31.7 %), step = 1.409 ps    (6.96 m%)
   pss: time = 6.581 ns    (32.5 %), step = 2.338 ps    (11.5 m%)
   pss: time = 7.018 ns    (34.7 %), step = 684.8 fs    (3.38 m%)
   pss: time = 7.414 ns    (36.6 %), step = 1.088 ps    (5.37 m%)
   pss: time = 7.595 ns    (37.5 %), step = 2.591 ps    (12.8 m%)
   pss: time = 8.021 ns    (39.6 %), step = 1.541 ps    (7.61 m%)
   pss: time = 8.499 ns      (42 %), step = 1.46 ps     (7.21 m%)
   pss: time = 8.606 ns    (42.5 %), step = 1.191 ps    (5.88 m%)
   pss: time = 9.085 ns    (44.9 %), step = 1.316 ps     (6.5 m%)
   pss: time = 9.544 ns    (47.1 %), step = 1.217 ps    (6.01 m%)
   pss: time = 9.621 ns    (47.5 %), step = 2.987 ps    (14.7 m%)
   pss: time = 10.01 ns    (49.4 %), step = 722.2 fs    (3.57 m%)
   pss: time = 10.4 ns     (51.4 %), step = 432.4 fs    (2.14 m%)
   pss: time = 10.63 ns    (52.5 %), step = 628.1 fs     (3.1 m%)
   pss: time = 11.16 ns    (55.1 %), step = 601 fs      (2.97 m%)
   pss: time = 11.64 ns    (57.5 %), step = 859.6 fs    (4.24 m%)
   pss: time = 12.22 ns    (60.3 %), step = 3.403 ps    (16.8 m%)
   pss: time = 12.66 ns    (62.5 %), step = 700.7 fs    (3.46 m%)
   pss: time = 13.18 ns    (65.1 %), step = 2.268 ps    (11.2 m%)
   pss: time = 13.67 ns    (67.5 %), step = 1.191 ps    (5.88 m%)
   pss: time = 14.18 ns      (70 %), step = 1.814 ps    (8.96 m%)
   pss: time = 14.68 ns    (72.5 %), step = 2.16 ps     (10.7 m%)
   pss: time = 15.3 ns     (75.5 %), step = 418.4 fs    (2.07 m%)
   pss: time = 15.7 ns     (77.5 %), step = 3.053 ps    (15.1 m%)
   pss: time = 16.3 ns     (80.5 %), step = 865 fs      (4.27 m%)
   pss: time = 16.71 ns    (82.5 %), step = 3.65 ps       (18 m%)
   pss: time = 17.3 ns     (85.5 %), step = 974.5 fs    (4.81 m%)
   pss: time = 17.72 ns    (87.5 %), step = 1.454 ps    (7.18 m%)
   pss: time = 18.35 ns    (90.6 %), step = 897.2 fs    (4.43 m%)
   pss: time = 18.73 ns    (92.5 %), step = 3.033 ps      (15 m%)
   pss: time = 19.35 ns    (95.6 %), step = 908.3 fs    (4.49 m%)
   pss: time = 19.74 ns    (97.5 %), step = 2.216 ps    (10.9 m%)
Total time required for tstab analysis `pss': CPU = 394.933 s (6m  34.9s), elapsed = 399.07 s (6m  39.1s).
Time accumulated: CPU = 394.934 s (6m  34.9s), elapsed = 399.07 s (6m  39.1s).
Peak resident memory used = 121 Mbytes.

Conv norm = 12.8e+03, max dV(I0.I222|I217|I187|T3:int_d) = 1.52032 V, took 393.25 s.

Important parameter values in pss iteration:
   start = 20 ns
   outputstart = 0 s
   stop = 20.25 ns
   period = 250 ps
   maxperiods = 20
   steadyratio = 10e-03
   step = 20.25 ps
   maxstep = 1.25 ps
   ic = all
   useprevic = no
   skipdc = no
   reltol = 100e-06
   abstol(V) = 1 uV
   abstol(I) = 1 pA
   temp = 27 C
   tnom = 27 C
   tempeffects = all
   errpreset = conservative
   method = gear2
   lteratio = 10
   relref = alllocal
   cmin = 0 F
   gmin = 1 pS


=================================
`pss': time = (20 ns -> 20.25 ns)
=================================
   pss: time = 20.01 ns     (2.6 %), step = 253
Back to top
 
 
View Profile   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #6 - Nov 2nd, 2016, 3:24pm
 
=================================
`pss': time = (20 ns -> 20.25 ns)
=================================

Warning from spectre at time = 20.0002 ns during periodic steady state analysis `pss'.
   WARNING (SPECTRE-16266): Error requirements were not satisfied because of convergence difficulties.
Warning from spectre at time = 20.0002 ns during periodic steady state analysis `pss'.
   WARNING (SPECTRE-16266): Error requirements were not satisfied because of convergence difficulties.
Warning from spectre at time = 20.0002 ns during periodic steady state analysis `pss'.
   WARNING (SPECTRE-16266): Error requirements were not satisfied because of convergence difficulties.

   pss: time = 20 ns      (97.9 m%), step = 10.83 fs    (4.33 m%)

Warning from spectre at time = 20.0003 ns during periodic steady state analysis `pss'.
   WARNING (SPECTRE-16266): Error requirements were not satisfied because of convergence difficulties.
Warning from spectre at time = 20.0003 ns during periodic steady state analysis `pss'.
   WARNING (SPECTRE-16266): Error requirements were not satisfied because of convergence difficulties.
       Further occurrences of this warning will be suppressed.

   pss: time = 20 ns       (133 m%), step = 59.28 fs    (23.7 m%)
   pss: time = 20 ns       (151 m%), step = 30.14 fs    (12.1 m%)
   pss: time = 20 ns       (187 m%), step = 50.2 fs     (20.1 m%)
   pss: time = 20 ns       (227 m%), step = 51.64 fs    (20.7 m%)
Jacobian was reordered during integration. Don't use swap file in PSS analysis
   pss: time = 20 ns       (256 m%), step = 10.17 fs    (4.07 m%)
   pss: time = 20 ns       (466 m%), step = 4.955 fs    (1.98 m%)
   pss: time = 20 ns       (849 m%), step = 28.64 fs    (11.5 m%)
   pss: time = 20 ns       (1.44 %), step = 49.64 fs    (19.9 m%)
   pss: time = 20 ns       (1.93 %), step = 10.16 fs    (4.06 m%)
   pss: time = 20.01 ns    (2.27 %), step = 9.225 fs    (3.69 m%)
   pss: time = 20.01 ns    (2.47 %), step = 3.324 fs    (1.33 m%)
   pss: time = 20.01 ns     (2.5 %), step = 16.59 fs    (6.64 m%)
   pss: time = 20.01 ns    (2.79 %), step = 15.14 fs    (6.06 m%)
   pss: time = 20.01 ns    (3.25 %), step = 13.1 fs     (5.24 m%)
   pss: time = 20.01 ns    (3.55 %), step = 52.38 fs      (21 m%)
   pss: time = 20.01 ns    (4.02 %), step = 49.2 fs     (19.7 m%)
   pss: time = 20.01 ns    (4.19 %), step = 2.91 fs     (1.16 m%)
   pss: time = 20.01 ns    (4.77 %), step = 43.44 fs    (17.4 m%)
   pss: time = 20.01 ns    (5.27 %), step = 21.82 fs    (8.73 m%)
   pss: time = 20.01 ns    (5.65 %), step = 31.5 fs     (12.6 m%)
   pss: time = 20.02 ns    (6.08 %), step = 33.41 fs    (13.4 m%)
   pss: time = 20.02 ns    (6.66 %), step = 6.118 fs    (2.45 m%)
   pss: time = 20.02 ns    (7.04 %), step = 12.45 fs    (4.98 m%)
   pss: time = 20.02 ns     (7.5 %), step = 40.55 fs    (16.2 m%)
   pss: time = 20.02 ns    (8.18 %), step = 21.31 fs    (8.52 m%)
   pss: time = 20.02 ns    (8.56 %), step = 7.893 fs    (3.16 m%)
   pss: time = 20.02 ns    (9.26 %), step = 25.27 fs    (10.1 m%)
   pss: time = 20.03 ns    (10.3 %), step = 28.73 fs    (11.5 m%)
   pss: time = 20.03 ns      (11 %), step = 12.16 fs    (4.86 m%)
   pss: time = 20.03 ns    (11.5 %), step = 36.91 fs    (14.8 m%)
   pss: time = 20.03 ns    (12.3 %), step = 40.89 fs    (16.4 m%)
   pss: time = 20.03 ns    (12.5 %), step = 90.72 fs    (36.3 m%)
   pss: time = 20.03 ns    (12.9 %), step = 91.41 fs    (36.6 m%)
   pss: time = 20.03 ns    (13.5 %), step = 50.25 fs    (20.1 m%)
   pss: time = 20.03 ns    (13.9 %), step = 96.42 fs    (38.6 m%)
   pss: time = 20.04 ns    (14.3 %), step = 26.18 fs    (10.5 m%)
   pss: time = 20.04 ns    (14.5 %), step = 30.52 fs    (12.2 m%)
   pss: time = 20.04 ns    (14.7 %), step = 30.52 fs    (12.2 m%)
   pss: time = 20.04 ns      (15 %), step = 32.17 fs    (12.9 m%)
   pss: time = 20.04 ns    (15.2 %), step = 34.06 fs    (13.6 m%)
   pss: time = 20.04 ns    (15.6 %), step = 35.63 fs    (14.3 m%)
   pss: time = 20.04 ns    (15.8 %), step = 35.63 fs    (14.3 m%)
   pss: time = 20.04 ns      (16 %), step = 33.69 fs    (13.5 m%)
   pss: time = 20.04 ns    (16.3 %), step = 32.39 fs      (13 m%)
   pss: time = 20.04 ns    (16.5 %), step = 32.39 fs      (13 m%)
   pss: time = 20.04 ns    (16.9 %), step = 34.03 fs    (13.6 m%)
   pss: time = 20.04 ns    (17.1 %), step = 34.45 fs    (13.8 m%)
   pss: time = 20.04 ns    (17.5 %), step = 33.13 fs    (13.3 m%)
   pss: time = 20.04 ns    (17.5 %), step = 37.25 fs    (14.9 m%)
   pss: time = 20.04 ns    (17.9 %), step = 47.08 fs    (18.8 m%)
   pss: time = 20.05 ns    (18.2 %), step = 86.16 fs    (34.5 m%)
   pss: time = 20.05 ns    (18.5 %), step = 92.15 fs    (36.9 m%)
   pss: time = 20.05 ns    (18.7 %), step = 37.03 fs    (14.8 m%)
   pss: time = 20.05 ns      (19 %), step = 24.88 fs    (9.95 m%)
   pss: time = 20.05 ns    (19.2 %), step = 30.69 fs    (12.3 m%)
   pss: time = 20.05 ns    (19.5 %), step = 61.37 fs    (24.5 m%)
   pss: time = 20.05 ns    (19.6 %), step = 29.01 fs    (11.6 m%)
   pss: time = 20.05 ns    (19.9 %), step = 30.69 fs    (12.3 m%)
   pss: time = 20.05 ns    (20.3 %), step = 42.73 fs    (17.1 m%)
   pss: time = 20.05 ns    (20.5 %), step = 35.89 fs    (14.4 m%)
   pss: time = 20.05 ns    (20.8 %), step = 22.84 fs    (9.13 m%)
   pss: time = 20.05 ns    (21.1 %), step = 35.84 fs    (14.3 m%)
   pss: time = 20.05 ns    (21.3 %), step = 71.68 fs    (28.7 m%)
   pss:
Back to top
 
 
View Profile   IP Logged
deba
Community Member
***
Offline



Posts: 84

Re: pss does not converge
Reply #7 - Nov 4th, 2016, 5:15pm
 
I think the circuit which you are trying is a 25% duty cycle generator for mixers. Do you have slow settling nodes in your circuit? Like some biasing ? Is PSS not converging for schematic or extraction?
Back to top
 
 
View Profile   IP Logged
Ken Kundert
Global Moderator
*****
Offline



Posts: 2220
Silicon Valley
Re: pss does not converge
Reply #8 - Nov 5th, 2016, 10:35pm
 
Quote:
Actually I inject 4GhZ Clock generator and it gives me four non overlap clock at 1Ghz


If the inputs are periodic in 1GHz, why are you specifying 4GHz as the fundamental frequency?

-Ken
Back to top
 
 
View Profile WWW   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #9 - Nov 8th, 2016, 8:46am
 
deba wrote on Nov 4th, 2016, 5:15pm:
I think the circuit which you are trying is a 25% duty cycle generator for mixers. Do you have slow settling nodes in your circuit? Like some biasing ? Is PSS not converging for schematic or extraction?


Yes,duty cycle is 25%, No I do not have any biasing except vdd
Pss does not converge for schematic  and also extraction
Back to top
 
 
View Profile   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #10 - Nov 8th, 2016, 8:50am
 
[quote author=kundert link=1477843044/0#8 date=1478410502] Quote:
Actually I inject 4GhZ Clock generator and it gives me four non overlap clock at 1Ghz


If the inputs are periodic in 1GHz, why are you specifying 4GHz as the fundamental frequency?

input is 4Ghz clcok and output is four nonoverlap clcok at 1Ghz
I even  change input frequncy  to 1Ghz ,did not converge again




Periodic Steady-State Analysis `pss': fund = 1 GHz
**************************************************
Trying `homotopy = gmin' for initial conditions.

Notice from spectre during IC analysis, during periodic steady state analysis `pss'.
   GminDC = 1 pS is large enough to noticeably affect the DC solution.
       dV(I0.I171|I1|T3:int_d) = -93.7384 mV
       Use the `gmin_check' option to eliminate or expand this report.
   Bad pivoting is found during DC analysis. Option dc_pivot_check=yes is recommended for possible improvement of convergence.

DC simulation time: CPU = 834.874 ms, elapsed = 833.564 ms.

============================
`pss': time = (0 s -> 21 ns)
============================

Important parameter values in tstab integration:
   start = 0 s
   outputstart = 0 s
   stop = 21 ns
   period = 1 ns
   maxperiods = 20
   step = 21 ps
   maxstep = 40 ps
   ic = all
   useprevic = no
   skipdc = no
   reltol = 1e-03
   abstol(V) = 1 uV
   abstol(I) = 1 pA
   temp = 27 C
   tnom = 27 C
   tempeffects = all
   method = gear2
   lteratio = 3.5
   relref = sigglobal
   cmin = 0 F
   gmin = 1 pS

   pss: time = 525 ps       (2.5 %), step = 483.5 fs     (2.3 m%)
   pss: time = 1.287 ns    (6.13 %), step = 863.3 fs    (4.11 m%)
   pss: time = 1.578 ns    (7.51 %), step = 2.744 ps    (13.1 m%)
   pss: time = 2.44 ns     (11.6 %), step = 1.996 ps     (9.5 m%)
   pss: time = 2.625 ns    (12.5 %), step = 1.971 ps    (9.39 m%)
   pss: time = 3.492 ns    (16.6 %), step = 2.259 ps    (10.8 m%)
   pss: time = 3.676 ns    (17.5 %), step = 1.363 ps    (6.49 m%)
   pss: time = 4.543 ns    (21.6 %), step = 1.086 ps    (5.17 m%)
   pss: time = 4.726 ns    (22.5 %), step = 2.499 ps    (11.9 m%)
   pss: time = 5.598 ns    (26.7 %), step = 2.286 ps    (10.9 m%)
   pss: time = 5.775 ns    (27.5 %), step = 607.5 fs    (2.89 m%)
   pss: time = 6.638 ns    (31.6 %), step = 999.4 fs    (4.76 m%)
   pss: time = 6.826 ns    (32.5 %), step = 1.418 ps    (6.75 m%)
   pss: time = 7.632 ns    (36.3 %), step = 630.2 fs       (3 m%)
   pss: time = 7.875 ns    (37.5 %), step = 1.099 ps    (5.23 m%)
   pss: time = 8.646 ns    (41.2 %), step = 471.5 fs    (2.25 m%)
   pss: time = 8.925 ns    (42.5 %), step = 1.071 ps     (5.1 m%)
   pss: time = 9.742 ns    (46.4 %), step = 2.252 ps    (10.7 m%)
   pss: time = 9.976 ns    (47.5 %), step = 2.458 ps    (11.7 m%)
   pss: time = 10.86 ns    (51.7 %), step = 2.665 ps    (12.7 m%)
   pss: time = 11.03 ns    (52.5 %), step = 449 fs      (2.14 m%)
   pss: time = 11.91 ns    (56.7 %), step = 733.5 fs    (3.49 m%)
   pss: time = 12.08 ns    (57.5 %), step = 2.222 ps    (10.6 m%)
   pss: time = 12.99 ns    (61.8 %), step = 1.774 ps    (8.45 m%)
   pss: time = 13.13 ns    (62.5 %), step = 2.464 ps    (11.7 m%)
   pss: time = 14.01 ns    (66.7 %), step = 631.9 fs    (3.01 m%)
   pss: time = 14.18 ns    (67.5 %), step = 1.58 ps     (7.53 m%)
   pss: time = 15.06 ns    (71.7 %), step = 1.931 ps    (9.19 m%)
   pss: time = 15.23 ns    (72.5 %), step = 2.676 ps    (12.7 m%)
   pss: time = 16.12 ns    (76.8 %), step = 1.729 ps    (8.23 m%)
   pss: time = 16.28 ns    (77.5 %), step = 286.2 fs    (1.36 m%)
   pss: time = 17.15 ns    (81.7 %), step = 868.3 fs    (4.13 m%)
   pss: time = 17.33 ns    (82.5 %), step = 1.19 ps     (5.67 m%)
   pss: time = 18.19 ns    (86.6 %), step = 2.236 ps    (10.6 m%)
   pss: time = 18.38 ns    (87.5 %), step = 2.002 ps    (9.53 m%)
   pss: time = 19.18 ns    (91.3 %), step = 2.22 ps     (10.6 m%)
   pss: time = 19.43 ns    (92.5 %), step = 1.16 ps     (5.53 m%)
   pss: time = 20.26 ns    (96.5 %), step = 656.6 fs    (3.13 m%)
   pss: time = 20.48 ns    (97.5 %), step = 2.918 ps    (13.9 m%)
Total time required for tstab analysis `pss': CPU = 249.32 s (4m  9.3s), elapsed = 250.305 s (4m  10.3s).
Time accumulated: CPU = 249.32 s (4m  9.3s), elapsed = 250.305 s (4m  10.3s).
Peak resident memory used = 111 Mbytes.

Conv norm = 12.8e+03, max dV(I0.I212|I0|T2_1__rcx:int_d) = 1.51496 V, took 247.78 s.

Important parameter values in pss iteration:
   start = 20 ns
   outputstart = 0 s
   stop = 21 ns
   period = 1 ns
   maxperiods = 20
   steadyratio = 10e-03
   step = 21 ps
   maxstep = 5 ps
   ic = all
   useprevic = no
   skipdc = no
   reltol = 100e-06
   abstol(V) = 1 uV
   abstol(I) = 1 pA
   temp = 27 C
   tnom = 27 C
   tempeffects = all
   errpreset = conservative
   method = gear2
   lteratio = 10
   relref = alllocal
   cmin = 0 F
   gmin = 1 pS
==============================
`pss': time = (20 ns -> 21 ns)
==============================
   pss: time = 20.03 ns    (2.51 %), step = 91.17 fs    (9.12 m%)
   pss: time = 20.08 ns     (7.5 %), step = 398.3 fs    (39.8 m%)
   pss: time = 20.13 ns    (12.5 %), step = 111.1 fs    (11.1 m%)
   pss: time = 20.18 ns    (17.5 %), step = 625.7 fs    (62.6 m%)
   pss: time = 20.23 ns    (22.5 %), step = 422.5 fs    (42.3 m%)
   pss: time = 20.28 ns    (27.5 %), step = 91.64 fs    (9.16 m%)
   pss: time = 20.33 ns    (32.5 %), step = 678 fs      (67.8 m%)
 
Back to top
 
 
View Profile   IP Logged
sanazadib
New Member
*
Offline



Posts: 9

Re: pss does not converge
Reply #11 - Nov 8th, 2016, 8:52am
 
`pss': time = (20 ns -> 21 ns)
==============================
   pss: time = 20.03 ns    (2.51 %), step = 91.17 fs    (9.12 m%)
   pss: time = 20.08 ns     (7.5 %), step = 398.3 fs    (39.8 m%)
   pss: time = 20.13 ns    (12.5 %), step = 111.1 fs    (11.1 m%)
   pss: time = 20.18 ns    (17.5 %), step = 625.7 fs    (62.6 m%)
   pss: time = 20.23 ns    (22.5 %), step = 422.5 fs    (42.3 m%)
   pss: time = 20.28 ns    (27.5 %), step = 91.64 fs    (9.16 m%)
   pss: time = 20.33 ns    (32.5 %), step = 678 fs      (67.8 m%)
   pss: time = 20.38 ns    (37.5 %), step = 585.3 fs    (58.5 m%)
   pss: time = 20.43 ns    (42.5 %), step = 709.4 fs    (70.9 m%)
   pss: time = 20.48 ns    (47.5 %), step = 1.273 ps     (127 m%)
   pss: time = 20.53 ns    (52.5 %), step = 221.2 fs    (22.1 m%)
   pss: time = 20.58 ns    (57.5 %), step = 451.2 fs    (45.1 m%)
   pss: time = 20.63 ns    (62.5 %), step = 211.3 fs    (21.1 m%)
   pss: time = 20.68 ns    (67.5 %), step = 772.1 fs    (77.2 m%)
   pss: time = 20.73 ns    (72.6 %), step = 1.436 ps     (144 m%)
   pss: time = 20.78 ns    (77.5 %), step = 98.64 fs    (9.86 m%)
   pss: time = 20.83 ns    (82.5 %), step = 529 fs      (52.9 m%)
   pss: time = 20.87 ns    (87.5 %), step = 987.9 fs    (98.8 m%)
   pss: time = 20.93 ns    (92.6 %), step = 753.8 fs    (75.4 m%)
   pss: time = 20.98 ns    (97.6 %), step = 1.525 ps     (152 m%)
Conv norm = 2.94e+03, max dV(I0.I212|I0|T1:int_d) = -45.9961 mV, took 68.62 s.


==============================
`pss': time = (20 ns -> 21 ns)
==============================
   pss: time = 20.03 ns    (2.51 %), step = 88.82 fs    (8.88 m%)
   pss: time = 20.08 ns    (7.54 %), step = 1.08 ps      (108 m%)
   pss: time = 20.13 ns    (12.5 %), step = 126.6 fs    (12.7 m%)
   pss: time = 20.18 ns    (17.5 %), step = 629.2 fs    (62.9 m%)
   pss: time = 20.23 ns    (22.5 %), step = 818.5 fs    (81.9 m%)
   pss: time = 20.28 ns    (27.5 %), step = 74.51 fs    (7.45 m%)
   pss: time = 20.33 ns    (32.5 %), step = 392.7 fs    (39.3 m%)
   pss: time = 20.38 ns    (37.5 %), step = 937.5 fs    (93.8 m%)
   pss: time = 20.43 ns    (42.5 %), step = 774.3 fs    (77.4 m%)
   pss: time = 20.48 ns    (47.5 %), step = 1.262 ps     (126 m%)
   pss: time = 20.53 ns    (52.5 %), step = 291.3 fs    (29.1 m%)
   pss: time = 20.58 ns    (57.5 %), step = 742 fs      (74.2 m%)
   pss: time = 20.63 ns    (62.5 %), step = 187.4 fs    (18.7 m%)
   pss: time = 20.68 ns    (67.5 %), step = 758.3 fs    (75.8 m%)
   pss: time = 20.73 ns    (72.5 %), step = 1.199 ps     (120 m%)
   pss: time = 20.78 ns    (77.5 %), step = 97.55 fs    (9.76 m%)
   pss: time = 20.83 ns    (82.5 %), step = 435.3 fs    (43.5 m%)
   pss: time = 20.87 ns    (87.5 %), step = 979.8 fs      (98 m%)
   pss: time = 20.93 ns    (92.6 %), step = 758.6 fs    (75.9 m%)
   pss: time = 20.98 ns    (97.6 %), step = 949.6 fs      (95 m%)
Conv norm = 167, max dV(I0.I209|I184|T5:int_d) = -2.43831 mV, took 64.06 s.
`pss': time = (20 ns -> 21 ns)
==============================
   pss: time = 20.03 ns    (2.51 %), step = 90.86 fs    (9.09 m%)
   pss: time = 20.08 ns    (7.57 %), step = 842 fs      (84.2 m%)
   pss: time = 20.13 ns    (12.5 %), step = 114.1 fs    (11.4 m%)
   pss: time = 20.18 ns    (17.5 %), step = 696.7 fs    (69.7 m%)
   pss: time = 20.23 ns    (22.5 %), step = 808.4 fs    (80.8 m%)
   pss: time = 20.28 ns    (27.5 %), step = 89.89 fs    (8.99 m%)
   pss: time = 20.33 ns    (32.5 %), step = 781.5 fs    (78.2 m%)
   pss: time = 20.38 ns    (37.5 %), step = 848.3 fs    (84.8 m%)
   pss: time = 20.43 ns    (42.5 %), step = 759.5 fs    (75.9 m%)
   pss: time = 20.48 ns    (47.5 %), step = 1.328 ps     (133 m%)
   pss: time = 20.53 ns    (52.5 %), step = 282.4 fs    (28.2 m%)
   pss: time = 20.58 ns    (57.5 %), step = 462 fs      (46.2 m%)
   pss: time = 20.63 ns    (62.5 %), step = 232.5 fs    (23.3 m%)
   pss: time = 20.68 ns    (67.5 %), step = 768.7 fs    (76.9 m%)
   pss: time = 20.73 ns    (72.5 %), step = 1.384 ps     (138 m%)
   pss: time = 20.78 ns    (77.5 %), step = 90.51 fs    (9.05 m%)
   pss: time = 20.83 ns    (82.5 %), step = 583.7 fs    (58.4 m%)
   pss: time = 20.87 ns    (87.5 %), step = 716.7 fs    (71.7 m%)
   pss: time = 20.93 ns    (92.6 %), step = 759.1 fs    (75.9 m%)
   pss: time = 20.98 ns    (97.6 %), step = 1.966 ps     (197 m%)
Conv norm = 94.4, max dV(I0.I212|I0|T3:int_g) = -1.43786 mV, took 62.84 s.
==============================
`pss': time = (20 ns -> 21 ns)
==============================
   pss: time = 20.03 ns    (2.51 %), step = 90.86 fs    (9.09 m%)
   pss: time = 20.08 ns    (7.57 %), step = 842 fs      (84.2 m%)
   pss: time = 20.13 ns    (12.5 %), step = 120.7 fs    (12.1 m%)
   pss: time = 20.18 ns    (17.5 %), step = 442.2 fs    (44.2 m%)
   pss: time = 20.23 ns    (22.5 %), step = 820.8 fs    (82.1 m%)
   pss: time = 20.28 ns    (27.5 %), step = 79.16 fs    (7.92 m%)
   pss: time = 20.33 ns    (32.5 %), step = 691 fs      (69.1 m%)
   pss: time = 20.38 ns    (37.5 %), step = 987.3 fs    (98.7 m%)
   pss: time = 20.43 ns    (42.5 %), step = 804.3 fs    (80.4 m%)
   pss: time = 20.48 ns    (47.6 %), step = 1.368 ps     (137 m%)
   pss: time = 20.53 ns    (52.5 %), step = 207 fs      (20.7 m%)
   pss: time = 20.58 ns    (57.5 %), step = 968.1 fs    (96.8 m%)
   pss: time = 20.63 ns    (62.5 %), step = 199.8 fs      (20 m%)
   pss: time = 20.68 ns    (67.6 %), step = 775.1 fs    (77.5 m%)
Back to top
 
 
View Profile   IP Logged
deba
Community Member
***
Offline



Posts: 84

Re: pss does not converge
Reply #12 - Nov 8th, 2016, 5:50pm
 
Your input is fin and output is at fin/4. The PSS fundamental period should be defined as fin/4. For 4 GHz, you should use 1 GHz. Similarly for 1 GHz, beat is 250 MHz.
Back to top
 
 
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2019 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.