RF Electronics Chapter 2: Computer Simulation Page 31
2022, C. J. Kikkert, James Cook University, ISBN 978-0-6486803-9-0.
For many simulations using imported SPICE models, warnings like "Value of
(SDIODE!_S1_D3.RS) < RMin (changed to 10.000u)" may be shown. If preferred, they
can be removed by changing RS in the line "SDIODE 5 0 ID="D3" IS=1e-10 N=0.4
RS=3e-06 BV=1e+15" in the original PSPICE file from RS=3e-06 to RS=10e-06.
Figure 2.35. Buck Converter voltage waveforms at probes and pulse generator.
Figure 2.36. Close-up of steady state voltage of figure 2.35.
The output voltage has a small steady state ripple, which can be seen plotting the time
waveforms from 1.45 to 1.5 ms. Plotting the output voltage (VP2) on the right axis allows
the voltage scale to be magnified. The steady state output voltage as obtained by the
transient analysis is close to 12 V as shown in figure 2.36. The current waveforms of the
buck converter of figure 2.32 are shown in figures 2.37 and 2.38.
RF Electronics: Design and Simulation
31 www.cadence.com/go/awr
