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Examples<br />

Example 23—Parametric Sensitivity Analysis<br />

# PARAM PCX = 1.000000e-14<br />

:# TEMPERATURE = 2.700000e+01<br />

:# X MEAS(MAX) MEAS(BANDWIDTH) MEAS(PHASE_MARGIN_1) MEAS(GAIN_MARGIN_1) MEAS(UNIT_GAIN_FREQ)<br />

MEAS(PHASE_MARGIN_2) MEAS(OPP_PHASE_FREQ) MEAS(GAIN_MARGIN_2)<br />

:1.000e-14 7.239e+01 5.542e+07 4.868e+00 3.995e+00 4.648e+07 4.869e+00 5.873e+07 3.995e+00<br />

:<br />

:<br />

:# PARAM PCX = 1.258925e-14<br />

:# TEMPERATURE = 2.700000e+01<br />

:# X MEAS(MAX) MEAS(BANDWIDTH) MEAS(PHASE_MARGIN_1) MEAS(GAIN_MARGIN_1) MEAS(UNIT_GAIN_FREQ)<br />

MEAS(PHASE_MARGIN_2) MEAS(OPP_PHASE_FREQ) MEAS(GAIN_MARGIN_2)<br />

:1.259e-14 7.239e+01 5.320e+07 6.736e+00 5.175e+00 4.456e+07 6.737e+00 6.042e+07 5.175e+00<br />

:<br />

:<br />

:# PARAM PCX = 1.584893e-14<br />

:# TEMPERATURE = 2.700000e+01<br />

:# X MEAS(MAX) MEAS(BANDWIDTH) MEAS(PHASE_MARGIN_1) MEAS(GAIN_MARGIN_1) MEAS(UNIT_GAIN_FREQ)<br />

MEAS(PHASE_MARGIN_2) MEAS(OPP_PHASE_FREQ) MEAS(GAIN_MARGIN_2)<br />

:1.585e-14 7.239e+01 5.071e+07 8.906e+00 6.381e+00 4.241e+07 8.907e+00 6.187e+07 6.381e+00<br />

:<br />

:<br />

:# PARAM PCX = 1.995262e-14<br />

:# TEMPERATURE = 2.700000e+01<br />

:# X MEAS(MAX) MEAS(BANDWIDTH) MEAS(PHASE_MARGIN_1) MEAS(GAIN_MARGIN_1) MEAS(UNIT_GAIN_FREQ)<br />

MEAS(PHASE_MARGIN_2) MEAS(OPP_PHASE_FREQ) MEAS(GAIN_MARGIN_2)<br />

:1.995e-14 7.239e+01 4.797e+07 1.140e+01 7.594e+00 4.003e+07 1.140e+01 6.297e+07 7.594e+00<br />

:<br />

:<br />

:# PARAM PCX = 2.511886e-14<br />

:# TEMPERATURE = 2.700000e+01<br />

:# X MEAS(MAX) MEAS(BANDWIDTH) MEAS(PHASE_MARGIN_1) MEAS(GAIN_MARGIN_1) MEAS(UNIT_GAIN_FREQ)<br />

MEAS(PHASE_MARGIN_2) MEAS(OPP_PHASE_FREQ) MEAS(GAIN_MARGIN_2)<br />

2.512e-14 7.239e+01 4.501e+07 1.423e+01 8.791e+00 3.746e+07 1.423e+01 6.360e+07 8.791e+00<br />

# PARAM PCX = 3.162278e-14<br />

# TEMPERATURE = 2.700000e+01<br />

# X MEAS(MAX) MEAS(BANDWIDTH) MEAS(PHASE_MARGIN_1) MEAS(GAIN_MARGIN_1) MEAS(UNIT_GAIN_FREQ)<br />

MEAS(PHASE_MARGIN_2) MEAS(OPP_PHASE_FREQ) MEAS(GAIN_MARGIN_2)<br />

3.162e-14 7.239e+01 4.187e+07 1.741e+01 9.952e+00 3.472e+07 1.742e+01 6.369e+07 9.952e+00<br />

...<br />

...<br />

Example 23—Parametric Sensitivity Analysis<br />

Netlist file: sensitivity_parametric.cir<br />

This example shows how to use the .SENSPARAM analysis. This parametric sensitivity<br />

analysis computes the sensitivity of the output metrics (all the .EXTRACT statements) to<br />

selected subcircuit parameters. The example is an opamp whose MOS geometries are<br />

parameterized. A transient analysis is setup to compute the relative overshoot of the output<br />

signal (the opamp is connected in voltage follower configuration, and driven with a pulse type<br />

Eldo® User's Manual, 15.3 1331

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