Salahshoor
Joined: 17 Nov 2005
Posts: 45
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 27 Jul 2008 7:42 help on ads |
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i have designed a vco in tsmc 0.18u version2
when i analyze it to obtain phase noise whith hb-simulation it report this problem:
Warning detected by hpeesofsim in frequency search during HB analysis `HB1'.
Circuit is stable. No zero phase crossings of the injected current were
found. For oscillation, a negative going zero phase crossing should exist.
Will try fixed frequency amplitude search.
Error detected by hpeesofsim in arc-length continuation during HB analysis `HB1'.
Value of `HB1_OP.V' went out of range during arc-length continuation.
The range is -999.998 V to 2 kV.
Convergence hints:
o Expand the range with ArcMinValue and ArcMaxValue and re-simulate.
Warning detected by hpeesofsim during HB analysis `HB1'.
Oscillator analysis did not converge. Setting solution to zero.
Warning detected by hpeesofsim during HB analysis `HB1'.
More than one mixing term has landed on frequency 0 Hz.
Status / Summary
hpeesofsim (*) 2008.200 Nov 4 2007 (built: 11/04/07 09:44:20)
Copyright Agilent Technologies, 1989-2007.
HB HB1[1] <<string/GEMX netlist>>
. The circuit appeared to be stable during initial frequency search.
Retrying with a smaller frequency step...
The circuit appeared to be stable during initial frequency search.
Retrying with a smaller frequency step...
The circuit appeared to be stable during initial frequency search.
Retrying with a smaller frequency step...
The circuit appeared to be stable during initial frequency search.
Retrying with a smaller frequency step...
HB_NOISE HB1[1] <<string/GEMX netlist>> noisefreq=(1 MHz->10 GHz) 2 points
..
Resource usage:
Total stopwatch time: 3.95 seconds.
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Simulation finished: dataset `vco2' written in:
`I:\Assignments\rf_assignments\osillator_amplifier\ads\vco_prj/data'
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---- Creating New Display Window ----
---- Please Wait... ----
---- Window Created ----
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can everyone help me?
i also attach my circuit
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