Pole-zero analysis: four RL stages

Poles of four coupled high-Q RL stages.

Like the three-stage example, but with four stages and much larger resistances, so the poles have very high Q.

Output

pole(1) = -1.01952e+09,0.000000e+00
pole(2) = -8.29696e+08,0.000000e+00
pole(3) = -8.65205e+07,0.000000e+00
pole(4) = -1.06059e+07,0.000000e+00

The circuit: examples/pz2.cir

test pz
iin	1	0	ac
r1	1	0	1.019524e+9Ohms
l1	1	0	1H

gm2	2	0	1 0 1
r2	2	0	8.296965e+08Ohms
l2	2	0	1H

gm3	3	0	2 0 1
r3	3	0	8.652054e+07Ohms
l3	3	0	1H

gm4	4	0	3 0 1
r4	4	0	1.060594e+07Ohms
l4	4	0	1H

*gm5	5	0	4 0 1
*r5	5	0	10Ohms
*l5	5	0	0.66mH

.control
pz	1 0	4 0	cur pol
print all
.endc
.end

Run it with spice pz2.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