Requires: SmartSpice & Smartview

Minimum Versions: SMARTSPICE 4.6.5.R

The circuit input deck is a 5th-order Lowpass filter containing pole zero analysis (.PZ). Rubberband r*[res], c*[cap] and l*ind] parameters to see changes in the resonant poles of the circuit.

Input Files

rubberband_example_19.in

* 5th-order lowpass filter
**
*
**
in 0 1 1.00 ac 1
r1 1 0 1.0
c3 1 0 1.52
c4 2 0 1.50
c5 3 0 0.83
c1 1 2 0.93
l1 1 2 0.65
c2 2 3 3.80
l2 2 3 1.00
r2 3 0 1.00
*
.PZ 3 0 1 0 cur PZ

.OPTIONS 
+        nomod
+        COEF2 = 1.E-9 ; abstol
*+        COEF3 = 1.E-9 ; reltol
*+        BYPASS = 1
**************************************
*    pole(1) = -5.4509e-01, 0.0000e+00
*    pole(2) = -1.1827e-01, 8.9149e-01
*    pole(3) = -1.1827e-01,-8.9149e-01
*    pole(4) = -6.9485e-02, 4.6718e-01
*    pole(5) = -6.9485e-02,-4.6718e-01
*    zero(1) =  0.0000e+00, 5.1299e-01
*    zero(2) =  0.0000e+00,-5.1299e-01
*    zero(3) =  0.0000e+00, 1.2862e+00
*    zero(4) =  0.0000e+00,-1.2862e+00
**************************************
.END