how to plot voltage vs time delay in ltspice?

[vinay_r]

www.edaboard.com

hi

i am trying to design a PFD for a PLL. i want to check if the PFD has a dead zone. so i swept the time delay (td) of one of the inputs to the PFD from 0 to T, where T is the time period of the pulse input. now i want to plot the up/down voltages vs the time delay (td). i am using LTspice. thanks in advance. here is my netlist file:

V1 COM 0 1.8
XM2 N001 RESET 0 0 NMOS l=.18u w=7.2u
XM1 COM RESET N002 COM PMOS w=28.8u l=.18u
XM3 N002 F1 N001 COM PMOS w=28.8u l=.18u
XM4 N004 N001 0 0 NMOS l=.18u w=21.6u
XM5 Qu F1 N004 0 NMOS l=.18u w=21.6u
XM6 COM N001 Qu COM PMOS w=21.6u l=.18u
V3 F1 0 PULSE(0 1.8 0 50p 50p 8n 16n)
V4 F2 0 PULSE(0 1.8 {td} 50p 50p 8n 16n)
XM10 N007 N005 0 0 NMOS l=.18u w=21.6u
XM11 Qd F2 N007 0 NMOS l=.18u w=21.6u
XM12 COM N005 Qd COM PMOS w=21.6u l=.18u
XM13 COM Qd N003 COM PMOS w=36u l=.18u
XM14 N003 Qu RESET COM PMOS w=36u l=.18u
XM15 RESET Qd 0 0 NMOS l=.18u w=9u
XM16 RESET Qu 0 0 NMOS l=.18u w=9u
XM18 DN Qd 0 0 NMOS l=.18u w=9u
XM20 COM Qd DN COM PMOS w=18u l=.18u
XM17 UP Qu 0 0 NMOS l=.18u w=9u
XM19 COM Qu UP COM PMOS w=18u l=.18u
XM7 N005 RESET 0 0 NMOS l=.18u w=7.2u
XM8 COM RESET N006 COM PMOS w=28.8u l=.18u
XM9 N006 F2 N005 COM PMOS w=28.8u l=.18u
.lib C:\Program Files\LTC\SwCADIII\lib\cmp\standard.mos
.tran 0 32n 16n
.step lin param td 0 16n 1n
.backanno
.end