48 lines
1.8 KiB
SourcePawn
48 lines
1.8 KiB
SourcePawn
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*ng_script
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* Perform Monte Carlo simulation in ngspice
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* script for use with 25 stage Ring-Osc. BSIM3
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* circuit is in MC_2_circ.sp
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* edit 'set sourcepath' for your path to circuit file
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* start script by 'ngspice -o MC_2_control.log MC_2_control.sp'
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*
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.control
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let mc_runs = 3 ; number of runs for monte carlo
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let run = 1 ; number of the actual run
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* Where to find the circuit netlist file MC_2_circ.sp
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setcs sourcepath = ( /home/holger/Software/paranoia/examples/Monte_Carlo )
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* create file for frequency information
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echo Monte Carlo, frequency of R.O. > MC_frequ.log
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* run the simulation loop
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dowhile run <= mc_runs
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* without the reset switch there is some strange drift
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* towards lower and lower frequencies
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set run = $&run ; create a variable from the vector
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setseed $run ; set the rnd seed value to the loop index
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if run = 1
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source MC_2_circ.sp ; load the circuit once from file, including model data
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else
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mc_source ; re-load the circuit from internal storage
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end
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save buf ; we just need output vector buf, save memory by more than 10x
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tran 15p 2n 0
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write mc_ring{$run}.out buf ; write each sim output to its own rawfile
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linearize buf ; lienarize buf to allow fft
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fft buf ; run fft on vector buf
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let buf2=db(mag(buf))
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* find the frequency where buf has its maximum of the fft signal
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meas sp fft_max MAX_AT buf2 from=0.1G to=0.7G
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print fft_max >> MC_frequ.log ; print frequency to file
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destroy all ; delete all output vectors
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remcirc ; delete circuit
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let run = run + 1 ; increase loop counter
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end
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quit
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.endc
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.end
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