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Examples
Example 22—Extract Gain and Phase Margin of a 2-Stage Opamp
Figure 21-32. Example 21—Simulation Results Zoom
Example 22—Extract Gain and Phase Margin
of a 2-Stage Opamp
Netlist file: gain_phase_margins.cir
This example shows how to extract the gain and phase margin for an opamp. The opamp is
configured in open loop. The gain and phase margins are extracted in two different ways, to
illustrate the capabilities of the .EXTRACT statements and functions.
• The bandwidth is plotted versus the phase margin. With EZwave, open the
gain_phase_margins.swd file.
• The various extracted metrics are printed to a tabular output file.
The simulation is stepped using the compensation capacitor as the parameter. The gain and
phase margin quantities are automatically plotted versus the compensation capacitor value.
Summary of Eldo commands used in this example:
Eldo® User's Manual, 15.3 1327