Spice3f5

An RC and an RL network

AC analysis; phase plots with multiplot.

The same ac source drives two networks: a series capacitor into a resistor (a high pass, node 2) and a series inductor into a resistor (a low pass, node 3). The .control block sets units to degrees and plots the phase of each output in its own chart with multiplot.

-500501101001k10k100k1Mfrequency (Hz)vp(2)vp(3)
Phase of v(2) and v(3) (degrees)
  • vp(2)
  • vp(3)

The circuit: examples/rc.cir

rc circuit
vin 1 0 ac 1
c1 1 2 1n
r1 2 0 1k
l1 1 3 1m
r2 3 0 1k
.control
set units="degrees"
ac dec 10 1 1meg
plot vp(2) vp(3) multiplot ylimit -90 90
.endc
.end

Run it with spice rc.cir, or open it with File › Load netlist in the Qt window. The plots and output above were made by util/mkexamples.py, which runs the deck in batch mode. All examples