T-line with tapped loads along the line

*3.3V input source with 5ns delay, 100pS edges, 20ns pulse width, 40ns cycle time
Vin vin 0 3.3 PULSE(0 3.3 5e-9 100p 100p 20e-9 40e-9)

*source output impedance
rsrc vin tline_input 50

*the transmission line, 50 ohm, 4ns electrical length
t1 tline_input 0 a             0 z0=50 td=0.8ns
t2 a           0 b             0 z0=50 td=0.8ns
t3 b           0 c             0 z0=50 td=0.8ns
t4 c           0 d             0 z0=50 td=0.8ns
t5 d           0 tline_output  0 z0=50 td=0.8ns

*capacitive termaination at end of T-line and taps
*rload tline_output 0  10000 
cload1 a            0  10p
cload2 b            0  10p
cload3 c            0  10p
cload4 d            0  10p
cload5 tline_output 0  10p

.control
  set color0 = rgb:f/f/f ; background color (white)
  set color1 = rgb:0/0/0 ; grid and text color
  set color2 = rgb:f/0/0 ; 2-15 are vector colors
 op
 tran 100ps 40ns
 plot  V(tline_input) V(a) V(b) V(c) V(d) V(tline_output) xl 1ns 45ns
 .endc



.end