014_measure : stability analysis
Requires: SmartSpice & Smartview
Minimum Versions: SMARTSPICE 3.16.12.R
- Some forms of .MESURE statement
Here a simple test circuit of a Bipolar "long-tail" pair is used with a sine wave input to generate waveforms under transient analysis. The transient vectors are then referenced by a .MEASURE statement to extract key values. This indicates some of the power of thw .Measure statement that can be applied to a number of anlysis like AC, DC, FFT etc. as well as TRAn analysis, more details are given in a chapter of the SmartSpice users manual.
Input Files
ex1_multi_meas.in
DEMO EXAMPLE 1: INPUT FILE ******************************************************************************* * Do multiple .MEASURE statements on whole or part of vector output waveforms * and store results in output RAW file *****************************************************************************cs VIN 1 0 DC 0 SIN(0 0.1 5.1MEG) AC 1 VCC 8 0 DC 10 VEE 9 0 DC -12 RS1 1 2 1K RS2 5 0 1K RC1 3 8 10K RC2 4 8 10K RBIAS 7 8 20K CLOAD 3 4 5PF Q1 3 2 6 QNL Q2 4 5 6 QNL Q3 6 7 9 QNL Q4 7 7 9 QNL .MODEL QNL NPN(BF=80 RB=100 CCS=2PF TF=0.3NS TR=6NS CJE=3PF CJC=2PF VA=50) * .OPTION savemeasures .DC VIN -0.25 0.25 0.025 .OP current 20ns .TRAN 5NS 2.0u * .measure DC max_ic_q1 MAX ic(Q1) .measure tran max_in MAX v(VIN) .measure tran max_isup1 max i(VEE) .measure tran max_isup2 max i(VCC) .measure tran max_iload max i(cload) .meas tran new_val PARAM ='max_isup1 - max_isup2' ********************* new meas setup .param var_t0 = 50n .param var_t15 = 1550n .meas tran pt_r1_0 find I(RC1) at=var_t0 .meas tran pt_r1_15 find I(RC1) at=var_t15 .meas tran slope param="(pt_r1_15 - pt_r1_0) / (var_t15 - var_t0)" .meas tran y0 param="pt_r1_0 - slope*var_t0" ************************************* .save all(v) all(i) .OPTIONS ACCT RELTOL=0.001 NOMOD .END
ex1_multi_meas.measure.raw0
Title: DEMO EXAMPLE 1: INPUT FILE Input deck file name: U:\smartspice_web\analysis\014_measure\ex1_multi_meas.in Date: Thu Nov 14 17:37:34 2019 Plotname: Measure Plot Temperature: 0 Sweepvar: max_ic_q1 Sweepmode: 0 Flags: real padded No. Variables: 10 No. Points: 1 Source: SmartSpice,Platform:0 Version: 4.38.1.R Variables: 0 max_ic_q1 notype 1 max_in notype 2 max_isup1 notype 3 max_isup2 notype 4 max_iload notype 5 new_val notype 6 pt_r1_0 notype 7 pt_r1_15 notype 8 slope notype 9 y0 notype Values: 0 1.063523287715098e-003 1.000000000000000e-001 2.322313224847328e-003 -2.292432322858670e-003 2.558617001457824e-004 4.614745547705998e-003 -6.872456899788083e-004 -5.578289290819505e-004 8.627784059790520e+001 -6.915595820087036e-004
014_measure
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Graphics
