#76 parallel/series reduction of resistor network yields size errors. Issue created by d-m-bailey Netgen

1.5.253

Here's the schematic and here are the comparison results

sky130_fd_pr__res_xhigh_po:4 vs. bgr_sym:1/sky130_fd_pr__res_xhigh_po:R5:
 w circuit1: 36.57   circuit2: 37.26   (delta=1.87%, cutoff=1%)
Circuit 2 parallel/series network does not match Circuit 1
Circuit 1 instance sky130_fd_pr__res_xhigh_po:4 network:
  l = 27
  w = 36.57
  M = 1
+
  l = 27
  w = 0.69
Circuit 2 instance bgr_sym:1/sky130_fd_pr__res_xhigh_po:R5 network:
  m = 1
  mult = 1
  L = 27
  W = 37.26
sky130_fd_pr__res_xhigh_po:5 vs. sky130_fd_pr__res_xhigh_po:R2:
 w circuit1: 6.9   circuit2: 7.59   (delta=9.52%, cutoff=1%)
Circuit 2 parallel/series network does not match Circuit 1
Circuit 1 instance sky130_fd_pr__res_xhigh_po:5 network:
  l = 24
  w = 6.9
  M = 1
+
  l = 24
  w = 0.69
Circuit 2 instance sky130_fd_pr__res_xhigh_po:R2 network:
  m = 1
  mult = 3
  L = 24
  W = 7.59
sky130_fd_pr__res_xhigh_po:12 vs. sky130_fd_pr__res_xhigh_po:R1:
 w circuit1: 3.45   circuit2: 4.14   (delta=18.2%, cutoff=1%)
Circuit 2 parallel/series network does not match Circuit 1
Circuit 1 instance sky130_fd_pr__res_xhigh_po:12 network:
  l = 24
  w = 3.45
  M = 1
+
  l = 24
  w = 0.69
Circuit 2 instance sky130_fd_pr__res_xhigh_po:R1 network:
  m = 1
  mult = 2
  L = 24
  W = 4.14
sky130_fd_pr__res_xhigh_po:7 vs. bgr_sym:1/sky130_fd_pr__res_xhigh_po:R6:
 w circuit1: 10.35   circuit2: 11.04   (delta=6.45%, cutoff=1%)
Circuit 2 parallel/series network does not match Circuit 1
Circuit 1 instance sky130_fd_pr__res_xhigh_po:7 network:
  l = 27
  w = 10.35
  M = 1
+
  l = 27
  w = 0.69
Circuit 2 instance bgr_sym:1/sky130_fd_pr__res_xhigh_po:R6 network:
  m = 1
  mult = 1
  L = 27
  W = 11.04

Looks like the source side might be merging series resistors with

w

values that don't match. Parallel resistors merge if

l

is equal by adding

w

and series resistors merge if

w

is equal by adding

l

, correct? Test data is in

test_lpo1

here. RTimothyEdwards/netgen