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Examples<br />

Example 22—Extract Gain and Phase Margin of a 2-Stage Opamp<br />

.plot extract extract(bandwidth) (versus) extract(phase_margin_2)<br />

The above line specifies to plot “compromise” graphs. For example, as the compensation<br />

capacitance is swept, you can view the bandwidth versus the phase margin.<br />

.option numdgt=3<br />

.printfile AC meas(*) file=opamp_margins.txt<br />

The .PRINTFILE statement is used to print results in tabular format to an ASCII file,<br />

opamp_margins.txt. The measurements from all the .EXTRACT statements are printed to the<br />

file. The NUMDGT option is specified to limit the number of decimals used when printing<br />

numbers.<br />

Simulation Results<br />

Figure 21-33. Example 22—Simulation Results 1<br />

Eldo® User's Manual, 15.3 1329

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