Requires: SmartSpice & Smartview

Minimum Versions: SMARTSPICE 3.16.12.R

SmartSpice RC-reduction tool:

SMARTSPICE has a built-in RLC-reduction tool that can be used on input decks that contain RLC parasitic elements.

To invoke RLC-reduction tool SMARTSPICE needs to be launched with ‘-rclevel <level_number>’ command line option, where <level_number> is described as follows:

• rclevel=0 – RLC-reduction for subcircuits
• rclevel=1 – RLC-reduction for subcircuits with post-filtering
• rclevel=2 – RLC-reduction for subcircuits and top-level
• rclevel=3 – RLC-reduction for subcircuits and top-level with post-filtering
• rclevel=4 – RLC-reduction for expanded netlist
• rclevel=5 – RLC-reduction for expanded netlist with post-filtering
• rclevel=6 – RLC-reduction for DSPF annotated netlist
• rclevel=7 – RLC-reduction for DSPF annotated netlist with post-filtering

Example:

smartspice -b -rclevel 0 ex.in
-or-
smartspice -b -rclevel 2 ex.in
-or-
smartspice -b -rclevel 4 ex.in
etc.

Details can be found in the SmartSpice User Manual 1 Chapter 15

The input
deck is a SPICE file containing the test bench of SPICE statements, options, and models required to run ths simulation.

Input Files

ex.in

** rc-reduction test 

.option acct=2

.subckt  A  1  2 
     r1  1  3   999 
     r2  3  4   998 
     r3  4  2   997 
.ends A

.subckt  B  1  2 
     x1  1 3  A
     r1  3 4  996
     r2  3 4  995
     r3  3 4  994
     r4  4 2  993
.ends B

.subckt  C  1  2 
     r11 1 3  993
     r21 3 4  992
     r31 4 5  991
     c11 3 0  1p
     c21 3 0  1p
     c31 4 0  1p
     c41 4 0  1p
     x1  5 6  B
     x2  6 7  B
     r12 7 8  990
     r22 8 9  989
     r32 9 2  988
     c12 8 10 1p
     c22 10 0 1p
     c32 9 11  1p
     c42 11 0  1p
.ends C

V   1  0 pulse (0 5 0 0 0 5n 10n)
X1  1  2  c
X2  2  0  c
r1  2  n1  500
r2  n1 n2  250
r3  n2  0  250

.control
listing expanded
quit
.endc

.end